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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">All, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">I am passing along the article below regarding embodied carbon in building construction materials. EO 17-20 directs state agencies to construct “carbon neutral ready” buildings from 2022 onward,
a date not too far in the future. If your agency is planning any new construction projects – or any renovations (including interior remodels) – now is the time to start considering carbon in building materials.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">We are lucky to have as a resource DEQ’s Materials Management Division, which has been leading research on this topic. I encourage you to alert me and consult with Jordan Palmeri from DEQ if
you have any projects in the planning stage. They can offer tools and resources to help assess impacts and alternatives in building materials, from concrete to carpet and lots in between. You may also want to alert your A/E teams about this topic as you engage
them in future projects. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">DAS will also be exploring, with DEQ and ODOE, new policy options for sustainable design guidelines to address EO 17-20. We will keep you updated as this progresses.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Dave<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="article-type"><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Feature Article<o:p></o:p></span></p>
<h1><span lang="EN">The Urgency of Embodied Carbon and What You Can Do about It</span><span lang="EN" style="font-family:"inherit",serif"><o:p></o:p></span></h1>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Building materials emit massive amounts of carbon long before the lights go on. Here’s how thoughtful design can reduce global warming impact.<o:p></o:p></span></p>
<p class="byline"><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">by
<a href="https://www.buildinggreen.com/author/paula-melton"><span style="color:#1F2898">Paula Melton</span></a><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">This article is also available as a printable
<strong><span style="font-family:"Trebuchet MS",sans-serif">BuildingGreen Spotlight Report</span></strong>, including the CEU quiz.
<a href="https://www.buildinggreen.com/spotlight/carbon"><strong><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898">Download now</span></strong></a> »<o:p></o:p></span></p>
<p><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/mexico-airport-exterior.jpg&nid=51688"><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898;text-decoration:none"><img border="0" width="479" height="203" style="width:4.9916in;height:2.1166in" id="Picture_x0020_7" src="cid:image002.jpg@01D5DA7B.A56D1640" alt="https://www.buildinggreen.com/sites/default/files/styles/smartphone_full/public/articles/mexico-airport-exterior.jpg?itok=WQSFJIHH×tamp=1579202494"></span></a><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Arup used whole-building life-cycle assessment to help reduce the embodied carbon of the new Mexico City Airport. <o:p></o:p></span></p>
<p class="MsoNormal"><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">Rendering: Foster+Partners
</span></span><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Climate change is a rapidly escalating emergency, and we have a lot of hard work to do in order to mitigate its effects. For building professionals, that has typically meant increasing
energy efficiency and pushing for renewable energy production, thus reducing the amount of carbon generated by the fossil fuels we burn in order to operate our buildings.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">But as crucial as that is, it’s not enough: we also need to think about the greenhouse gases that are emitted to construct our buildings in the first place—the
</span><em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">embodied carbon</span></em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">. The manufacture of building materials makes up 11% of total global
greenhouse gas emissions, <a href="https://www.buildinggreen.com/newsbrief/urgent-zero-carbon-buildings-needed">
<span style="color:#1F2898">according to the latest data from the United Nations Environment Programme</span></a>.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">That 11% might sound small compared with the impact of operational energy (28%), but for new construction, embodied carbon matters just as much as energy efficiency and renewables.
That’s because the <a href="https://www.buildinggreen.com/op-ed/building-materials-and-time-value-carbon">
<span style="color:#1F2898">emissions we produce between now and 2050</span></a> will determine whether we meet the goals of the 2015
<a href="https://unfccc.int/process-and-meetings/the-paris-agreement/the-paris-agreement" target="_blank">
<span style="color:#1F2898">Paris climate accord</span></a> and prevent the worst effects of climate change.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">“We are making global progress in reducing operating emissions,” said Erin McDade, program manager at Architecture 2030. “According to the best scientific data and consensus, we
have to phase out all fossil fuel emissions by 2050. … Without embodied carbon, we will not meet our climate targets.”<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Defining Embodied Carbon</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Definitions of embodied carbon differ. Some view the embodied carbon of a building as including the entire life cycle of the materials, even the operational phase of the building—for
example, taking into account multiple replacement cycles of finishes over time. A full life-cycle view of embodied carbon would account for impacts of landfilling or recycling materials as well.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">For simplicity in this report, we are focusing on
</span><em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">initial embodied carbon</span></em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">—the impacts associated with extracting, manufacturing, and
transporting materials to the jobsite. “Carbon” is used to indicate all greenhouse gas emissions, not just carbon dioxide.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">So where do building professionals come in?<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Design teams have a huge role to play. This report focuses on how architects and designers, working with other key members of the project team, can find low-cost and no-cost ways
to reduce the embodied carbon of new construction projects.<o:p></o:p></span></p>
<h2><span lang="EN">Does It Need to Be New?</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h2>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The very first question to ask for any project is whether new construction is needed. By avoiding the use of new materials, we avoid their impacts altogether. Building reuse and
incorporation of salvaged building materials can greatly reduce the embodied carbon of construction.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">And while we’re at it, it’s also vital to think about the end of life of new buildings before they’re even built. It doesn’t make sense to emit carbon twice or three times when the
same building could serve two or three different uses over its lifetime. Consider design for future uses of whole buildings and design for deconstruction of systems so that materials can have a second life in another building.<o:p></o:p></span></p>
<h2><span lang="EN">Assessing Embodied Carbon</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h2>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Once you’ve identified embodied carbon as a problem to be solved, what happens next?<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The first step is to identify carbon “hot spots”—materials or systems that contribute the most to a building’s embodied greenhouse gas emissions. That way, project teams can prioritize
the materials that make the most difference and can start finding solutions that have the biggest impact.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The most widely accepted method for assessing embodied carbon is whole-building life-cycle assessment (WBLCA), but other tools can supplement this as a first step.<o:p></o:p></span></p>
<h3><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/mexico-airport_0.jpg&nid=51688"><span style="color:#1F2898;text-decoration:none"><img border="0" width="479" height="240" style="width:4.9916in;height:2.5in" id="Picture_x0020_6" src="cid:image003.jpg@01D5DA7B.A56D1640" alt="https://www.buildinggreen.com/sites/default/files/styles/smartphone_full/public/articles/mexico-airport_0.jpg?itok=WIL7oW9_×tamp=1579202494"></span></a><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h3>
<p><b><span lang="EN" style="font-size:18.0pt;font-family:"inherit",serif;color:#44404B">By replacing portland cement and using other carbon-reducing strategies, the team was able to cut the embodied carbon of the new Mexico City Airport project by 130 million
kilograms.<o:p></o:p></span></b></p>
<h3 style="margin-top:0in"><span class="credit1"><span lang="EN" style="font-size:9.0pt">Rendering: Foster+Partners
</span></span><b><span lang="EN" style="font-size:18.0pt;font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></b></h3>
<h3><span lang="EN">Getting started: free databases<o:p></o:p></span></h3>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">To get a general sense of proportion and start getting a feel for the carbon footprint of common materials, there are a few free resources available. One is the
<a href="http://www.circularecology.com/embodied-energy-and-carbon-footprint-database.html#.W1dJPY6LSPQ" target="_blank">
<span style="color:#1F2898">Bath Inventory of Carbon and Energy</span></a> (ICE), which has the advantage of being a long-respected source of embodied carbon data. The main drawback of ICE is that it’s not updated frequently; data are also specific to the U.K.
BEES (Building for Environmental and Economic Sustainability) is a similar tool offering North American data.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">A newer resource is
<a href="https://www.buildinggreen.com/news-analysis/free-database-can-guide-early-design-decisions-carbon-health">
<span style="color:#1F2898">the Quartz database</span></a>, which has basic environmental-impact and health-related data on 102 common building materials. Carbon data come from thinkstep, an internationally respected life-cycle analysis firm, and are specific
to the U.S.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Keep in mind, though, that these resources are a first step: they can give you a sense of the baseline embodied carbon of brick or aluminum or foam insulation, but they don’t tell
you a lot more than that. (The carbon footprint is listed under “global warming potential” and is expressed in kilograms of carbon dioxide equivalent.) It’s not even really appropriate to compare materials because their embodied carbon is listed here by weight.
You wouldn’t want to compare a kilogram of brick to a kilogram of aluminum; that makes no sense in the context of a building project.<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">New: Embodied Carbon Guidance for Designers</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Architecture 2030 is introducing the Carbon Smart Materials Palette, a tool laypeople like architects and designers can use to identify and take action on embodied carbon “hot spots”
in building materials.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Working with a network of life-cycle assessment experts, Architecture 2030 developed the tool to provide “high-level and easy-to-digest information” about specific building materials
like steel, concrete, finishes, and insulation, according to Erin McDade, program manager at Architecture 2030. Each “swatch” in the palette includes a material’s basic attributes, information about how the material is produced and where its embodied carbon
footprint comes from, and design guidance for reducing its footprint.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Users can learn more about the Carbon Smart Materials Palette on the
<a href="http://architecture2030.org/" target="_blank"><span style="color:#1F2898">Architecture 2030 website</span></a>.<o:p></o:p></span></p>
<h3><span lang="EN">Digging deeper: EPDs</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h3>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Some of these problems are solved when you look at
<a href="https://www.buildinggreen.com/feature-shorts/what-s-epd-environmental-product-declaration-faqs">
<span style="color:#1F2898">environmental product declarations</span></a> (EPDs) for the carbon footprint of specific products. EPDs are usually based on “functional units” rather than weight, and many will provide the carbon footprint of a specific product
or set of products rather than a generic baseline. (The exception is a so-called industry-wide EPD, whose job is to set a baseline to compare with product-specific EPDs.)<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">An EPD consists of life-cycle assessment (LCA) information summarized in an easier-to-read format. It looks at a number of impact categories beyond global warming potential (like
smog and eutrophication), but it’s the go-to place to learn about the carbon footprint of a specific product.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">But EPDs have drawbacks as well, the biggest one being that laypeople are not in a good position to compare their results. You definitely can’t compare steel to concrete, for example,
and it’s a tricky business even to compare one concrete mix to another. For more on (not) comparing EPDs, see
<a href="https://www.buildinggreen.com/feature-shorts/apples-pineapples-four-reasons-you-can-t-compare-epds">
<span style="color:#1F2898">Apples to Pineapples: Four Reasons You Can’t Compare EPDs</span></a> and
<a href="https://www.buildinggreen.com/feature-shorts/wood-concrete-and-steel-and-their-incomparable-epds">
<span style="color:#1F2898">Wood, Concrete, and Steel and Their Incomparable EPDs</span></a>.<o:p></o:p></span></p>
<h3><span lang="EN">The gold standard: whole-building life-cycle assessment</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h3>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The only way to get a really clear picture of how one material or system compares to another in the context of a building project is to use
<a href="https://www.buildinggreen.com/feature/whole-building-life-cycle-assessment-taking-measure-green-building">
<span style="color:#1F2898">whole-building life-cycle assessment</span></a>, or WBLCA. This process looks at multiple impacts of building materials, including global warming potential, over their entire life cycle—from extraction and manufacturing through the
landfill or recycling plant.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Although WBLCA requires specialized software and training, the good news is that this software is designed to be used by building professionals. The software can also be used to
conduct more limited studies, like comparisons of different structural systems or enclosure scenarios. Studies like these can be key to reducing the embodied carbon of a building because they allow designers to view multiple ways of accomplishing the same
goals. Two major tools dominate the WBLCA market in North America—<a href="http://www.athenasmi.org/our-software-data/impact-estimator/" target="_blank"><span style="color:#1F2898">Athena Impact Estimator</span></a> and
<a href="http://choosetally.com/" target="_blank"><span style="color:#1F2898">Tally</span></a>.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The Carbon Leadership Forum, a network of experts on the carbon impacts of the building industry, has developed an
<a href="http://www.carbonleadershipforum.org/lca-practice-guide/" target="_blank">
<span style="color:#1F2898">LCA practice guide</span></a> aimed at building professionals. Makers of WBLCA software tools also offer trainings to help users navigate the software and interpret results.<o:p></o:p></span></p>
<p><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/mithun-museum_1200.jpg&nid=51688"><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898;text-decoration:none"><img border="0" width="479" height="356" style="width:4.9916in;height:3.7083in" id="Picture_x0020_5" src="cid:image004.jpg@01D5DA7B.A56D1640" alt="https://www.buildinggreen.com/sites/default/files/styles/smartphone_full/public/articles/mithun-museum_1200.jpg?itok=nTjtr2Mv×tamp=1579202494"></span></a><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Architecture firm Mithun used life-cycle assessment tools to assess the benefits of cement replacement and the use of wood instead of concrete piers for the Louisiana Children’s
Museum in New Orleans.<o:p></o:p></span></p>
<p class="MsoNormal"><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">Photo: Mithun (Photography by Michael Fiegenschuh)
</span></span><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<h2><span lang="EN">Optimizing Structural Systems</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h2>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Not every project has a budget for a full-scale whole-building life-cycle assessment (although many firms are doing more limited LCA work on projects on their own time). Luckily,
there are takeaways from this process that project teams can apply to their everyday work without additional expense or, in some cases, even without client buy-in or knowledge needed.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">One of the most important takeaways from whole-building LCA is that structural systems almost always comprise the largest source of embodied carbon in the building—up to 80%, depending
on the building type. So the first goal when looking to reduce the embodied carbon of a project is to target the structural system. Concrete, steel, and wood can all be optimized in different ways to reduce impacts.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">In all this, it’s important to get the structural engineer involved early. “The form of the building often takes shape even before we get into schematic design,” noted Mark Webster,
P.E., a structural engineer with Simpson Gumpertz & Heger. “It would be great if architects would reach out earlier to us [structural engineers] to help them make decisions related to building form and structural materials.” He added, “It’s increasingly obvious,
the role that we have to play in terms of embodied impacts with respect to climate change.”<o:p></o:p></span></p>
<h3><span lang="EN">Concrete and cement</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h3>
<p><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/Time%20Value%20of%20Carbon_800px.png&nid=51688"><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898;text-decoration:none"><img border="0" width="480" height="371" style="width:5.0in;height:3.8666in" id="Picture_x0020_4" src="cid:image005.png@01D5DA7B.A56D1640" alt="90% of carbon released from new construction between 2015 and 2050 will be embodied carbon."></span></a><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">If things don’t change with how we treat embodied carbon, impacts will total 90% of the carbon released from newly constructed buildings between 2015 and 2050.<o:p></o:p></span></p>
<p class="MsoNormal"><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">Image: Architecture 2030
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Concrete has a large footprint because of the carbon-emitting process used to make one of its most important ingredients—the binder portland cement (see
<a href="https://www.buildinggreen.com/feature/reducing-environmental-impacts-cement-and-concrete">
<span style="color:#1F2898">Reducing Environmental Impacts of Cement and Concrete</span></a>). By some estimates, production of portland cement is responsible for 5% of total global CO</span><sub><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">2</span></sub><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">
emissions. Replacing some cement with supplemental cementitious materials (SCMs) like fly ash or blast-furnace slag is a go-to way for project teams to reduce the embodied carbon of the concrete in their projects.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">But that’s not always as simple as it might sound, and structural engineers have some advice about how to do it right.<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Takeaways: Concrete and Cement</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Cement is responsible for concrete’s
<strong><span style="font-family:"Trebuchet MS",sans-serif">large carbon footprint</span></strong>; a ton of cement represents about a ton of greenhouse gas emissions.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Fly ash and blast-furnace slag can improve certain properties of the concrete but can also
<strong><span style="font-family:"Trebuchet MS",sans-serif">take longer to cure</span></strong> and can affect the final color.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">All buildings—even wood buildings—contain a
<strong><span style="font-family:"Trebuchet MS",sans-serif">significant amount of concrete</span></strong>.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Avoid over-engineering without good reason: work with the structural engineer to ensure you’re
<strong><span style="font-family:"Trebuchet MS",sans-serif">using only as much concrete as you really need</span></strong>.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Consider working with the structural engineer on a
<strong><span style="font-family:"Trebuchet MS",sans-serif">performance-based concrete specification</span></strong> that sets environmental requirements.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo1">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">When calculating carbon reductions from using supplemental cementitious materials,
<strong><span style="font-family:"Trebuchet MS",sans-serif">choose an honest baseline</span></strong>—not a 100% cement mix, which is rare.<o:p></o:p></span></li></ul>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Engineering firm Walter P Moore has conducted about 20 whole-building LCAs in pursuit of the
<a href="https://leeduser.buildinggreen.com/credit/NC-v4/MRc1"><span style="color:#1F2898">Building Life-Cycle Impact Reduction credit</span></a> under LEED version 4, according to Dirk Kestner, P.E., director of sustainable design. Kestner’s takeaway? Every
project—even those with wood structural systems—contains substantial amounts of concrete, and cement content is one of the largest contributors to embodied carbon on a project.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">“One thing that people … need to start doing is thinking about how they specify their concrete and stop talking about it as ‘percent fly ash,’” said Kestner. “It’s about getting
cement content down and using only what you need.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Reducing cement content can take many forms, he said, including simply using less by specifying higher-quality aggregate or reducing water content. Kestner says successful lower-impact
concrete specifications can be performance-based—stating the structural requirements (how much strength is needed when) and environmental requirements (like global warming potential per yard of concrete) rather than specifying a percentage of cement and SCMs.
In other words, you might be able to reduce impacts further by asking for exactly what you want. Getting the structural engineer in direct dialogue with the ready-mix supplier is essential to this approach, he said.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Cure times and subtle color differences can be a barrier when using SCMs, according to Meghan Lewis, associate at Mithun, but “concrete in the foundation is not as time sensitive,”
and you don’t have to worry about color there, either. “You can have a huge impact just focusing on the foundation,” she suggested. That includes working with the structural engineer to ensure the foundation isn’t unnecessarily overdesigned—using less concrete
in the first place. All this can be done without added costs.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">For the new Mexico City Airport project, Arup conducted extensive life-cycle assessment studies to reduce embodied carbon (the project is pursuing LEED v4 certification). Although
the team spent most of the analysis time on modeling the enclosure correctly, in the end, according to Arup’s Frances Yang, S.E., it was the concrete mixes as well as the efficiency of the unique structural steel design that helped cut the total embodied carbon
of the planned building by 10% compared with a benchmark building. Embodied carbon reductions totaled 130 million kilograms of CO</span><sub><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">2</span></sub><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">
equivalent, she said—which is like taking 28,000 cars off the road for a year.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Yang emphasized the importance of using reasonable regional benchmarks for concrete, since it’s already commonplace to replace some cement content with SCMs. (The team also studied
the structural systems of several other airports with similar spans to establish a baseline tonnage of steel, she said.) The National Ready Mix Concrete Association publishes benchmark data that can be used for this purpose. “I don’t think it’s right to choose
an all-cement mix” as a baseline for all mixes, Yang said. “Go with what you have experience seeing.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Arup also worked with the Athena Sustainable Materials Institute, developer of Athena Impact Estimator tool, to ensure that all data were specific to the region—an important detail
since the software’s default data don’t extend beyond regions in the U.S. and Canada.</span><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/Mithun_UCI%20MIddle%20Earth_LCA%20Scope_800px.jpg&nid=51688"><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898;text-decoration:none"><img border="0" width="480" height="311" style="width:5.0in;height:3.2416in" id="Picture_x0020_3" src="cid:image006.jpg@01D5DA7B.A56D1640" alt=" This diagram shows the typical hot spots that are found while using LCA tools, helping designers identify where to spend time to make the biggest impact."></span></a><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">This diagram shows the typical hot spots that are found while using LCA tools, helping designers identify where to spend time to make the biggest impact.<o:p></o:p></span></p>
<p class="MsoNormal"><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">Image: Mithun (Meghan Lewis)
</span></span><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<h3><span lang="EN">Steel</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h3>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">By weight, steel has a much higher embodied carbon footprint than concrete does—with one ton of steel representing approximately a ton of greenhouse gas emissions. According to the
World Steel Association, steel production is responsible for 6.6% of greenhouse gas emissions globally—more than portland cement (see
<a href="https://www.buildinggreen.com/feature/better-steel-lower-impacts"><span style="color:#1F2898">Better Steel, Lower Impacts</span></a>). Those global numbers reflect use of dirtier technology in much of the world, which is still using basic oxygen furnaces
(BOF) rather than electric arc furnaces (EAF). In North America, the industry has mostly switched over to EAF technology—the process used to recycle steel. This, along with a cleaner electrical grid, has resulted in a 36% reduction in the industry’s carbon
footprint since 1990, according to Mark Thimons, P.E., vice president, sustainability, at the Steel Market Development Institute.<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Takeaways: Steel</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">A ton of steel represents about
<strong><span style="font-family:"Trebuchet MS",sans-serif">a ton of greenhouse gas emissions</span></strong>.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">North American steel generally has a
<strong><span style="font-family:"Trebuchet MS",sans-serif">lower carbon footprint</span></strong> than steel from overseas.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Concrete buildings use a lot steel for reinforcement; this can be
<strong><span style="font-family:"Trebuchet MS",sans-serif">90%–100% recycled steel</span></strong> if choosing North American products.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo2">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Avoid over-engineering without good reason: consider a
<strong><span style="font-family:"Trebuchet MS",sans-serif">braced frame rather than a moment frame</span></strong>, and work with the structural engineer to manage the architectural impacts.<o:p></o:p></span></li></ul>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">So that’s the first rule of thumb for reducing the embodied carbon of steel on a project: specify steel produced in North America—or, if that’s not possible, at least specify recycled
steel, which uses the better EAF technology.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The only other real option for reducing steel’s footprint is to use less—a practice that’s even promoted by the Steel Market Development Institute, a trade group. Aside from choosing
North American steel, “the other advice that we always give to architects and especially engineers is just to be as efficient as possible in designs,” Thimons told BuildingGreen. “We really encourage the concept of working with an integrative process. It can
result in some of those kinds of savings; more efficient designs result in better and lower environmental footprints.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Structural engineer Mark Webster agrees, advocating for “approaches like composite design, where the steel and concrete slab work together and can reduce the size of the beams.”
He added that “choice of lateral system can have a big impact on the quantity of steel” as well. Braced frames with diagonal braces use far less steel than moment frames, for example. “You end up with a lot more steel using those moment-resisting frames,”
he said. “For architects, it’s nice to use moment frames because you don’t have diagonal braces,” but braced frames can be strategically designed to reduce the architectural impact. That’s a good reason to get the structural engineer involved early when looking
to reduce embodied carbon.<o:p></o:p></span></p>
<h3><span lang="EN">Structural wood</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h3>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">You may have heard (<a href="https://www.buildinggreen.com/newsbrief/wood-structures-could-reduce-global-carbon-almost-third"><span style="color:#1F2898">including from BuildingGreen</span></a>)
that building with wood instead of concrete or steel has major carbon benefits. It seems to make sense, since
<a href="https://www.buildinggreen.com/feature/engineering-wood-revolution"><span style="color:#1F2898">wood products sequester carbon</span></a>, while concrete and steel are made by burning fossil fuels.
<a href="https://www.buildinggreen.com/news-analysis/would-wood-skyscrapers-improve-urban-sustainability">
<span style="color:#1F2898">Interest in building with mass timber structural products</span></a> like cross-laminated timber (CLT) has skyrocketed, in part because of the presumed lower embodied carbon impacts.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">But a few scientists are asking everyone to slow down, contending that LCAs have grossly overestimated the benefits of wood.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">“Wood is very tricky right now,” said Stephanie Carlisle, principal at KieranTimberlake and the lead developer of the Tally whole-building LCA software tool. “There is a big debate
happening.” And that’s frustrating for designers who want guidance they can use.<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Takeaways: Structural Wood</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo3">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">The <strong><span style="font-family:"Trebuchet MS",sans-serif">carbon impacts of wood</span></strong> are a source of contention, with a few scientists claiming that LCAs greatly overestimate the
benefits.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo3">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">What’s good for steel and concrete is good for wood:
<strong><span style="font-family:"Trebuchet MS",sans-serif">use only what you need</span></strong>.<o:p></o:p></span></li></ul>
<p style="margin-left:.5in;text-indent:-.25in;mso-list:l3 level1 lfo3"><![if !supportLists]><span lang="EN" style="font-size:10.0pt;font-family:Symbol;color:#333139"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><a href="https://www.buildinggreen.com/feature/urgency-embodied-carbon-and-what-you-can-do-about-it/sidebar/1"><span style="color:#1F2898">Read
more...</span></a></span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">“The more we’ve dug, the more [the numbers] seem to be all over the place,” said Arup’s Yang. “There is so much uncertainty carried with them.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">This uncertainty has many sources.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">First of all, LCAs mostly give wood a free pass when it comes to the state of the forest after harvesting. But a lot of carbon in forests is stored in the soil and below it, and
it’s unclear how much carbon and methane (a more potent greenhouse gas) is released when harvesting … and how much that depends on
</span><em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">how</span></em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"> the wood is harvested.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Second, there is the question of whether trees are being grown and replaced in such a way that we can truly assume carbon neutrality from forestry. As an example, for Douglas fir
in the Pacific Northwest, a harvest cycle of 40 to 45 years is standard in business-as-usual (BAU) forestry practices, according to Mark Harmon, Ph.D., professor at Oregon State University. Harmon coauthored a
<a href="http://www.pnas.org/content/early/2018/03/13/1720064115" target="_blank">
<span style="color:#1F2898">recent paper</span></a> implicating the Oregon timber industry as the largest source of carbon emissions in the state. The study found that an 80-year harvest cycle would be more beneficial for carbon storage in the forest because
the longer time period allows the trees to build to their optimum volume before harvesting.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Harmon compares a forest to a “leaky bucket”: “There is carbon pouring into the bucket [from absorbing CO</span><sub><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">2</span></sub><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">]
but always carbon flowing out” as well from harvesting, decomposition, and fires, he explained. “The thing that determines how leaky it is, is related to how long the ‘water’ [carbon] stays in the bucket. … A 45-year forest is a much leakier bucket than a
90-year one” because carbon is leaving it much more quickly. At 75 to 100 years of age, though, Douglas fir stops growing so quickly, meaning carbon storage slows, so it makes the most sense to harvest the trees then.<o:p></o:p></span></p>
<p><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/Table%20Embodied%20Carbon_web.png&nid=51688"><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898;text-decoration:none"><img border="0" width="480" height="547" style="width:5.0in;height:5.7in" id="Picture_x0020_2" src="cid:image007.png@01D5DA7B.A56D1640" alt="This table shows groups and programs addressing embodied carbon in the built environment."></span></a><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">Source:
BuildingGreen, Inc. </span></span><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Also, as this example shows, there is the issue of regional differences. Douglas fir reaches its optimum volume at a different age than, say, southern yellow pine. And a Douglas
fir forest will yield a different volume of wood at harvest than a southern yellow pine forest. So each will sequester different amounts of carbon per unit (whether you’re measuring by feet or kilograms or some other metric). It’s hard to generalize about
the benefits or drawbacks of wood, or even about appropriate forestry practices across the board. (This, incidentally, is why Forest Stewardship Council standards differ by region.)<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Once the wood is harvested, it requires significant energy to be kiln-dried; most of this energy comes from burning waste wood, which is given a free pass as “carbon neutral” by
the U.S. Environmental Protection Agency. But a contentious <a href="https://www.manomet.org/project/woody-biomass-energy/" target="_blank">
<span style="color:#1F2898">2010 report commissioned by the Commonwealth of Massachusetts</span></a> calls that carbon neutrality into question, saying that the carbon footprint of burning woody biomass depends on a number of factors, including forestry practices,
and stating that in some cases burning wood is worse than burning fossil fuels.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">There’s also the fact that wood products continue to sequester carbon as long as they are in use, but the length of use is all over the map. Harmon’s group assumed a useful life
of 30 years, while others argue for 60 or even 100.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">And what happens when the wood is ultimately disposed of? It’s not clear how quickly wood products decay and emit methane in landfills. This dispute is reflected in WBLCA tools,
with Athena Impact Estimator assuming relative stability and Tally assuming quicker releases. (Currently, neither Athena nor Tally gives wood initial “credit” for sequestering carbon in a whole-building LCA, although in the upcoming new version of Tally, this
will be optional.)<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Carbon and FSC</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Wood products certified to the Forest Stewardship Council (FSC) standard have far better environmental credentials than wood products without certification, for a variety of reasons
(see <a href="https://www.buildinggreen.com/feature/certified-wood-how-sfi-compares-fsc">
<span style="color:#1F2898">Certified Wood: How SFI Compares to FSC</span></a>). FSC standards require a high level of ecosystem protection and help ensure social equity. And FSC upholds its standards by stripping companies of certification if they don’t follow
the rules.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">But can FSC wood claim a lower carbon footprint as well? Several signatories to a letter released by the Sierra Club earlier this year say it can.<o:p></o:p></span></p>
<p><strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><a href="https://www.buildinggreen.com/feature/urgency-embodied-carbon-and-what-you-can-do-about-it/sidebar/2"><span style="color:#1F2898">Read more...</span></a></span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"> <o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">“For those of us in the building industry, it gets really complicated,” sums up Kate Simonen, associate professor of architecture at the University of Washington, adding that people
tend to have emotional rather than scientific responses to the available data. “I have not found anybody who has made a fully rigorous connection that satisfies both of the extreme sides of the story, which makes it really difficult to interpret.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Simonen advises building professionals to use the material that makes the most sense for their projects and to optimize its use however they can. “If you take the average concrete
building and compare it to an average wood building, you might see that many different studies show wood tends to have a lower carbon footprint,” she noted. “That doesn’t say you couldn’t have optimized the concrete system to be at a similar level.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Speaking of optimizing, “you can have twice as much wood between the most optimum and least optimum configuration” in the same building, said Simonen. It’s better to follow the same
rules for wood as you would for concrete or steel and use only what you need.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Additionally, a huge trend toward mass timber might not be a great thing for forests, Simonen continued. “It is not necessarily better for the environment to start radically increasing
the amount of wood. If we started cutting down way more wood, we are changing the rate at which we remove carbon from the forest.” Hence, we would need to plan ahead for that eventuality and start planting more trees now to meet the demand in the coming decades.<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">And let’s not forget the other impacts beyond embodied carbon that all our building materials have, cautions structural engineer Kestner. “Some impacts like smog and eutrophication
and acidification might be closer to each other” when comparing wood with other systems, he said. “You wouldn’t want to only look at carbon.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Kestner added that, given the small number of mass-timber-producing plants in North America, it’s important to take transportation impacts into account as well. “I think that one
thing that should certainly be considered if you are using CLT and shipping it a very large distance is to understand the transportation impacts as you make your decisions,” he said.</span><a href="https://www.buildinggreen.com/sites/all/modules/bg_content/templates/imagemodal.php?image=https://www.buildinggreen.com/sites/default/files/articles/Tale%20of%205%20Bricks%20slide_800px.png&nid=51688"><span style="font-family:"Trebuchet MS",sans-serif;color:#1F2898;text-decoration:none"><img border="0" width="480" height="371" style="width:5.0in;height:3.8666in" id="Picture_x0020_1" src="cid:image008.png@01D5DA7B.A56D1640" alt="Different brick walls can have widely differing carbon impacts."></span></a><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Architect Brad Benke studied the impacts of brick façade systems and discovered that five functionally equivalent wall types had very different impacts. Thin brick on metal studs,
shown at the far right, reduced embodied carbon 58% compared with a baseline wall system (thin brick with precast concrete). <o:p></o:p></span></p>
<p class="MsoNormal"><span class="credit1"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif;color:#333139">Image: LMN Architects
</span></span><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">The upshot? Wood can be beneficial for its reduced footprint, but don’t use wood as a get-out-of-carbon-jail-free card. Consider which materials and systems make the most sense for
the project, and optimize how you use them, preferably with whole-building life-cycle assessment as a guide. And when using wood, choose FSC-certified products—or salvaged wood, to extend the carbon benefit of using wood products.<o:p></o:p></span></p>
<h2><span lang="EN">Considering Enclosures</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h2>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Structural systems bear the bulk of the embodied carbon footprint of buildings, but the enclosure is also significant, representing up to 15% of the global warming impact of a typical
commercial office building, according to Duncan Cox, associate at Thornton Tomasetti. (This number varies considerably by building type, he emphasized.)<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Takeaways: Enclosure Systems</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo4">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Structural systems are the
<strong><span style="font-family:"Trebuchet MS",sans-serif">most significant source of embodied carbon</span></strong>, but enclosures are also significant.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo4">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Enclosure systems are under the
<strong><span style="font-family:"Trebuchet MS",sans-serif">architect’s direct control</span></strong>.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo4">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Because of aluminum’s high embodied carbon,
<strong><span style="font-family:"Trebuchet MS",sans-serif">curtainwall systems</span></strong> have very large impacts. They also have high operational impacts, so it’s best to minimize their use.<o:p></o:p></span></li><li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo4">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Some types of <strong>
<span style="font-family:"Trebuchet MS",sans-serif">foam insulation</span></strong> (notably extruded polystyrene) have blowing agents with massive global warming potential. Seek alternatives.<o:p></o:p></span></li></ul>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">Cox said that, based on WBLCA studies he’s conducted over the years, the carbon hot spots in the enclosure tend to be aluminum curtainwall and foam insulation (the latter because
of high-embodied-carbon blowing agents—see <a href="https://www.buildinggreen.com/feature/avoiding-global-warming-impact-insulation">
<span style="color:#1F2898">Avoiding the Global Warming Impact of Insulation</span></a>). “When you start playing around with window-to-wall ratios, you can have quite a big impact” because of curtainwall’s footprint, he said. The embodied carbon of curtainwall
(not to mention the aluminum shading systems that often come with it) is just one more reason to minimize its use, since it has operational energy impacts as well (see
<a href="https://www.buildinggreen.com/feature/rethinking-all-glass-building"><span style="color:#1F2898">Rethinking the All-Glass Building</span></a>).<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">On opaque walls, cladding choices can also make a big difference (see
<a href="https://www.buildinggreen.com/feature/cladding-more-just-pretty-fa-ade">
<span style="color:#1F2898">Cladding: More Than Just a Pretty Façade</span></a>). Brad Benke, AIA, at LMN Architects, recently conducted an LCA considering different wall systems. “If you only have time to do one thing, hire a good engineer and work to reduce
the structural load,” he said, but his firm has invested in in-house LCA studies for the envelope. This helps because the firm is seeking ways to reduce impacts across the portfolio—not just on the super-green projects—and “architects are able to make decisions
about wall types; they do it all the time.” Benke added, “An important opportunity for architects … is being able to make changes without having to ask the owner a ton of questions or spend significant time coordinating with consultants.”<o:p></o:p></span></p>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">With that goal in mind, Benke looked at ten different wall systems, comparing their embodied impacts, then conducted a secondary study looking at five functionally equivalent brick
wall types. The winner? Thin brick on metal studs had the lowest embodied carbon among the options, showing a 58% reduction from the baseline building (thin brick with precast concrete). The best part is that this lower-embodied-carbon wall, to a casual observer,
looks and functions just the same. Benke said this was a finding that could be shared across the firm to help “improve the baseline of every project rather than just high-profile projects.” He added, “We really believe that a lot of firms could be doing work
like this. … We don’t have a lot of time to </span><em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">not</span></em><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"> do this work. It’s critical to start
now.”<o:p></o:p></span></p>
<p class="sidebar-head" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:0in">
<strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Takeaways: Embodied Carbon</span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif"><o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:#333139;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo5">
<span lang="EN" style="font-family:"Trebuchet MS",sans-serif">Embodied carbon is an
<strong><span style="font-family:"Trebuchet MS",sans-serif">urgent issue</span></strong> because the emissions we release in the next 20 to 30 years are critical to keeping global temperatures at tolerable levels.<o:p></o:p></span></li></ul>
<p style="margin-left:.5in;text-indent:-.25in;mso-list:l2 level1 lfo5"><![if !supportLists]><span lang="EN" style="font-size:10.0pt;font-family:Symbol;color:#333139"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><a href="https://www.buildinggreen.com/feature/urgency-embodied-carbon-and-what-you-can-do-about-it/sidebar/3"><span style="color:#1F2898">Read
more...</span></a></span></strong><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<h2><span lang="EN">Letting Go of Guilt</span><span lang="EN" style="font-family:"inherit",serif;color:#44404B"><o:p></o:p></span></h2>
<p><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139">“I think it’s really easy to get trapped in a lot of guilt,” said Kieran Timberlake’s Carlisle, because the building industry is responsible for such a large percentage of global
carbon emissions. But, she said, “There is room to do something on every project. ... I hope that can be really empowering for people.” She added, “We have an obligation to get involved.”<o:p></o:p></span></p>
<p><span class="label4"><span lang="EN" style="font-size:9.0pt;font-family:"Trebuchet MS",sans-serif">Published
</span></span><span lang="EN" style="font-family:"Trebuchet MS",sans-serif;color:#333139"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Dave Wortman, LEED AP BD+C, ISSP-SA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif">Statewide Sustainability Officer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif">Department of Administrative Services | State of Oregon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif">1225 Ferry St. SE, U100 | Salem, OR 97301-4281<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif">Mobile: 971-304-8733<o:p></o:p></span></p>
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