EPDs and the Decarbonization of Concrete: What Contractors Need to Know

Concrete is the second most consumed substance on earth after water, and its environmental impact is staggering. According to Architecture 2030, concrete is responsible for 8 percent of total global emissions, with 90 percent of those emissions coming directly from the cement content itself. For contractors working on building projects, understanding how to measure and reduce this carbon footprint is no longer optional. A growing number of project owners, especially those managing government-funded work, are requiring bidders to demonstrate sustainability credentials. At the heart of this shift lies the environmental product declaration (EPD), a third-party verified document that serves as a carbon roadmap for construction materials. Contractors who learn to read and apply EPD data gain a competitive edge in bidding, compliance, and project delivery. This article explores what EPDs are, how they support the decarbonization of concrete, and the practical steps contractors can take to put them to work. For a broader look at decorative concrete options, see Colorful Concrete Tiles a Complete Guide to Decorative.

Understanding Environmental Product Declarations

What an EPD Is and How It Works

An environmental product declaration is a standardized, third-party verified document that reports the environmental impact of producing a specific construction material. Think of it as a nutrition label for carbon. Just as a food label tells you calories, fat, and protein per serving, an EPD tells you the global warming potential (GWP) of a material measured in kilograms of CO₂ equivalent per cubic meter or per ton. It also discloses ozone depletion potential, acidification potential, eutrophication potential, and smog formation potential, though GWP is the metric contractors will reference most often.

EPDs are governed by international standards, primarily ISO 14025 and ISO 21930, and must follow product category rules (PCRs) specific to the type of material being declared. A concrete EPD, for example, will include details about the mix design, the cement type and content, the use of supplementary cementitious materials (SCMs), the distance from the batch plant to the project site, and whether the producer uses alternative fuels in the manufacturing process. This level of detail allows contractors to compare two similar concrete mixes side by side and choose the one with lower embodied carbon.

Why EPDs Matter for Concrete

The concrete and cement industry represents one of the largest opportunities for decarbonization in the building sector. Because concrete is so widely used, even modest reductions in its carbon intensity produce outsized benefits. The 2021 report from RMI found that integrating low-cost or no-cost solutions for reducing embodied carbon during the design and construction phases has the potential to cut emissions by 19 to 46 percent at cost premiums of less than 1 percent. EPDs are the foundational tool that makes those reductions possible. Without them, contractors and specifiers have no reliable way to compare the carbon performance of different concrete products.

It is important to note that the existence of an EPD does not automatically mean a product is sustainable. An EPD is a disclosure document, not a certification of environmental superiority. Two products with EPDs can have very different carbon footprints. The value comes from reading, comparing, and acting on the data. When more suppliers publish EPDs, the market becomes more transparent, and contractors gain the power to select genuinely lower-carbon options. For additional information on concrete construction methods, refer to a Guide On How to Construct a Concrete.

How EPDs Drive the Decarbonization of Concrete

Reducing Cement Content with Supplementary Materials

The single most effective strategy for lowering the carbon footprint of concrete is reducing the portland cement content in the mix. Cement manufacturing is responsible for roughly 90 percent of concrete’s embodied carbon because the chemical process of calcining limestone releases CO₂ directly, and the kilns themselves are fired at extreme temperatures, typically using fossil fuels. Substituting a portion of the cement with SCMs can dramatically reduce GWP without sacrificing performance.

Common supplementary cementitious materials include:

• Fly ash, a byproduct of coal-fired power plants
• Ground granulated blast-furnace slag (GGBFS), a byproduct of steel manufacturing
• Silica fume, a byproduct of silicon metal production
• Natural pozzolans such as calcined clay, volcanic ash, and metakaolin
• Limestone fines, which can replace a modest percentage of cement in certain applications

Each SCM has different properties and affects the concrete’s strength development, workability, and durability in unique ways. EPDs capture these differences by reporting the exact composition of the mix, allowing contractors to evaluate whether a lower-carbon alternative meets the project’s technical specifications.

Emerging Technologies and Industry Initiatives

Beyond SCM substitution, a wave of new technologies is entering the concrete decarbonization space. The Decarbonized Cement and Concrete Alliance (DC2) was recently founded to represent a coalition of emerging startups working on breakthrough solutions. These technologies span several categories:

1. Carbon capture and utilization, where CO₂ is captured from cement kiln exhaust and injected into fresh concrete where it mineralizes permanently
2. Alternative cement chemistries, such as belitic calcium sulfoaluminate cement or calcined clay limestone cement, that produce fewer emissions during manufacturing
3. Electric kilns powered by renewable energy, eliminating combustion emissions from the production process
4. Carbon mineralization aggregates, where CO₂ is permanently stored in synthetic aggregate particles

Each of these technologies will require its own set of EPDs so that contractors can evaluate the real-world carbon benefit. The industry is still in the early stages, but the momentum is building rapidly. For guidance on proper concrete placement, see a Guide On How to Consolidate Concrete in.

Practical Tools and Strategies for Contractors

Digital Platforms That Simplify EPD Comparison

Reading individual EPD documents for every material on a project is impractical at scale. Fortunately, digital tools have emerged that aggregate EPD data and make it searchable and comparable. Two of the most widely used platforms are the Embodied Carbon in Construction Calculator (EC3) and One Click LCA. These tools compile thousands of digitized EPDs from manufacturers across North America and beyond, allowing contractors to filter by material type, region, GWP range, and certification status.

Building Transparency, the organization behind EC3, reports that in markets where EPD data currently exists, users are seeing 30 percent or greater reductions in carbon emissions simply by using the tool to select and procure low-carbon materials. The impact is measurable and immediate. Contractors can log into these platforms, enter the required concrete volume for a project, and instantly see which suppliers offer the lowest-carbon mixes in their area.

Comparison Table: Common EPD Data Points for Concrete Mixes

By reviewing these six data points, a contractor can quickly determine whether a given concrete mix is a strong candidate for a low-carbon project. The table above shows the key fields that appear in a typical concrete EPD and explains why each one is relevant to procurement decisions.

Partnering with Suppliers Who Publish EPDs

A practical step contractors can take today is to prioritize relationships with material suppliers who routinely publish EPDs for their products. When a contractor asks a supplier for an EPD, it sends a market signal that transparency matters. Over time, as more customers demand EPDs, suppliers invest in better data collection, more frequent updates, and ultimately cleaner production processes. This creates a virtuous cycle: demand for low-carbon concrete drives supply, which in turn makes it easier for contractors to meet sustainability targets.

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The Path Forward: Education, Regulation, and Collective Action

Contractor Education Programs

Recognizing that knowledge gaps remain a barrier to adoption, several organizations have launched education programs specifically for contractors. Building Transparency’s contractorsCAN program is one example. Founding members include major firms such as Clark Construction, Skanska, Webcor, and Turner Construction. The program’s mission is to improve awareness of embodied carbon among contractors, identify opportunities for improving EPD tools and databases, and create practical resources that help construction teams integrate carbon considerations into daily workflows.

Other organizations offering contractor-focused resources include:

• The Carbon Leadership Forum, which publishes research and guidance on embodied carbon policy
• The American Center for Life Cycle Assessment (ACLCA), which offers training on life cycle assessment methodology
• The U.S. Green Building Council (USGBC), which integrates embodied carbon credits into the LEED rating system
• Architecture 2030, which provides benchmarking data and carbon reduction targets for the building sector

Regulatory Trends Driving EPD Adoption

Government procurement policies are increasingly requiring EPD submission as part of the bidding process. The Buy Clean initiative, adopted at both the federal and state levels in the United States, mandates that publicly funded construction projects use materials with published EPDs and, in some cases, meet maximum GWP thresholds. California, Colorado, Minnesota, New York, and Washington have all passed Buy Clean legislation. Similar policies are emerging in Canada, the European Union, and Australia. Contractors who are already comfortable with EPDs will have a significant advantage when competing for these projects.

Making the Business Case for Low-Carbon Concrete

For contractors who are still evaluating whether to invest time in EPD literacy, the business case is straightforward. Understanding EPDs helps contractors win more bids, comply with emerging regulations, differentiate their services from competitors, and future-proof their business against tightening carbon standards. Property owners, especially those pursuing LEED certification, net-zero commitments, or ESG reporting requirements, actively seek contractors who can demonstrate a track record of specifying low-carbon materials. Being able to point to specific EPD data during a bid presentation adds credibility that generic sustainability language cannot match.

The embodied carbon of construction materials, including concrete, is locked in from the moment they are produced. Unlike operational carbon, which can be reduced over a building’s life through energy efficiency upgrades and renewable energy, embodied carbon cannot be easily reversed. This makes upfront material selection one of the most impactful decisions a contractor can make. Every project that chooses a lower-carbon concrete mix avoids emissions that would otherwise remain in the atmosphere for decades.

Key Benefits of Using EPDs for Contractors

1. Improved bid competitiveness for sustainability-focused projects and government contracts
2. Regulatory compliance with Buy Clean policies and green building standards
3. Cost savings through optimized mix design and reduced material waste
4. Stronger supplier relationships based on transparency and shared sustainability goals
5. Measurable carbon reduction data for corporate ESG reporting and marketing

Collective action across the AEC industry is the only way to make real progress toward climate commitments. Contractors occupy a unique position in the supply chain: they choose materials, manage procurement, and build the structures that shape our communities. By embracing EPDs and the decarbonization of concrete, they are not only improving their own businesses but also contributing to a broader transformation of the built environment. The tools, the data, and the expertise are available. The question is which contractors will take the lead.