How Contractors Can Use EPDs to Decarbonize Concrete Construction

Environmental Product Declarations, or EPDs, are becoming an essential tool for contractors aiming to reduce the carbon footprint of their concrete work. As building codes tighten and project owners demand greater transparency, understanding how to read and apply EPD data can set your firm apart in competitive bidding. This guide walks through what EPDs tell you, how they connect to lower-carbon concrete mixes, and practical steps for integrating them into everyday construction practice. For a broader look at how the industry is evolving, see our article on proactive methods and materials for concrete construction.

What Is an EPD and Why Does It Matter for Concrete Contractors

An Environmental Product Declaration is a third-party verified document that reports the environmental impact of a building material across its life cycle. Think of it as a nutrition label for carbon. It tells you the global warming potential, or GWP, of a given concrete mix along with other impact categories such as acidification, ozone depletion, and water use. For contractors, the most valuable feature of an EPD is the ability to compare products side by side and select the mix with the lowest carbon footprint.

The Core Elements of an EPD

Every EPD follows international standards, primarily ISO 14025 and EN 15804. While the format can vary by program operator, these key sections appear in every declaration:

• Product description : The specific concrete mix design, including cement type, supplementary cementitious materials, aggregates, and admixtures
• Declared unit : Usually 1 cubic meter of concrete at a specified compressive strength
• Life cycle stages covered : Cradle-to-gate (A1 to A3) is most common for concrete, covering raw material extraction, transport, and manufacturing
• Impact results : GWP expressed in kilograms of CO2 equivalent per declared unit, plus other environmental indicators
• Program and verification details : The certification body and validity period of the declaration

Why Concrete Has Such High Embodied Carbon

Concrete is the second most consumed substance on earth after water, and its primary binder, Portland cement, is responsible for roughly 8 percent of global CO2 emissions. The chemistry of cement production releases CO2 both from burning fossil fuels to heat kilns and from the calcination of limestone itself. This dual source of emissions makes concrete a high-priority target for decarbonization efforts across the architecture, engineering, and construction industry.

EPDs give contractors a way to quantify the carbon impact of the concrete they specify and install. Without this data, it is nearly impossible to make informed decisions about which mixes deliver lower emissions without sacrificing performance.

How EPD Data Enables Lower-Carbon Concrete Selection

When a contractor understands the data in an EPD, they can work with ready-mix suppliers to choose concrete mixes that meet both structural requirements and carbon reduction goals. This does not require exotic materials. Many of the most impactful strategies are available today at minimal or no cost premium.

Supplementary Cementitious Materials

The single most effective way to reduce the carbon footprint of concrete is to replace a portion of the Portland cement with supplementary cementitious materials. Common SCMs include:

• Fly ash : A byproduct of coal combustion, widely used as a cement replacement at rates of 15 to 35 percent
• Ground granulated blast-furnace slag (GGBFS) : A byproduct of steel production, typically used at 25 to 50 percent replacement
• Silica fume : A very fine pozzolan used at lower rates, often 5 to 10 percent, to improve strength and durability
• Natural pozzolans : Materials such as calcined clay, volcanic ash, and metakaolin that offer lower-carbon alternatives with regional availability

Each SCM has different effects on strength gain, setting time, and durability. An EPD for a mix containing 30 percent fly ash will show a materially lower GWP than a mix using 100 percent Portland cement at the same strength class. By reviewing EPDs across multiple suppliers, contractors can identify which local producers offer the lowest-carbon options.

Using EC3 and Digital Tools

The Embodied Carbon in Construction Calculator, or EC3, is a free, open-source tool that aggregates digitized EPD data from thousands of building materials. Contractors can use EC3 to search for concrete mixes by region, strength, and application, then compare their GWP side by side. The tool draws from a database maintained by Building Transparency and includes EPDs verified under major programs such as UL Environment, ASTM, and NSF International.

For a deeper look at how digital tools are reshaping material selection, see our practical guide to measuring embodied carbon in building construction.

Practical Steps for Contractors to Implement EPD-Based Procurement

Moving from awareness to action requires a structured approach. Contractors who embed EPD requirements into their procurement process gain a competitive edge as owners increasingly prioritize low-carbon construction.

Step 1: Establish a Baseline

Before requesting EPDs, know what you are currently using. Work with your regular ready-mix suppliers to obtain EPDs for the standard mixes you specify most often. Record their GWP values to establish a baseline for each strength class and application type.

Step 2: Set Performance Targets

Use the baseline to set carbon reduction targets. Many projects now aim for a 20 to 30 percent reduction in embodied carbon compared to regional baselines. Government-funded projects and those pursuing green building certifications such as LEED v5 or the Living Building Challenge often require specific reductions backed by EPD data.

Step 3: Request EPDs With Every Bid

Include a requirement in bid documents that concrete suppliers must submit product-specific EPDs with their proposals. This shifts the market by making carbon transparency a standard part of the bidding process rather than an optional add-on.

Step 4: Compare and Select

When evaluating bids, rank suppliers not only by price and availability but also by the GWP of their proposed mixes. A lower-carbon mix that costs slightly more may still be the best choice when considering the project’s overall sustainability goals and potential incentives.

Table: Example GWP comparison for 4000 psi concrete mixes using different SCM strategies. Actual values vary by region and supplier.

Step 5: Document and Communicate

Collect all EPDs received during bidding and include them in the project documentation. When your team selects a lower-carbon mix, record the rationale and the resulting carbon savings. This documentation supports green building certification submissions and strengthens your firm’s credentials for future bids.

The Future of EPDs and Concrete Decarbonization

The concrete industry is undergoing rapid change. Emerging technologies and new industry collaborations are expanding the range of low-carbon options available to contractors.

Emerging Cement Technologies

Several companies are developing cement alternatives that go beyond SCM substitution. These include:

• Carbon-cured concrete : CO2 is injected into fresh concrete during mixing, where it mineralizes and becomes permanently stored. This process can reduce the carbon footprint by 5 to 10 percent while improving compressive strength
• Electrified cement production : Pilot plants are using electric kilns powered by renewable energy to eliminate fossil fuel combustion during clinker production
• Limestone calcined clay cement (LC3) : A blend of calcined clay and limestone that can reduce CO2 emissions by up to 40 percent compared to ordinary Portland cement while using widely available raw materials
• Carbon-negative aggregates : Some companies produce aggregates by mineralizing captured CO2 into calcium carbonate, creating a material that stores more carbon than is emitted during its production

Industry Partnerships Driving Scale

Major concrete producers are forming partnerships with technology companies and research institutions to accelerate the transition. One notable example is the Decarbonized Cement and Concrete Alliance, which represents a coalition of startups focused on scaling up low-carbon cement and concrete technologies. These collaborations aim to bring novel materials from pilot scale to commercial production within the next five to ten years.

For more on how industry partnerships are reshaping material supply chains, see our coverage of low-carbon concrete mixes industry partnerships.

Policy Drivers and Market Signals

Federal and state policies are increasingly requiring embodied carbon reporting and reduction. The Buy Clean initiative in the United States sets lower embodied carbon thresholds for construction materials used in federally funded projects. Several states have adopted their own Buy Clean policies, and more are expected to follow. These regulations make EPDs not just a sustainability tool but a compliance requirement for contractors who work on public projects.

At the same time, private sector owners, particularly in the technology and financial sectors, are setting aggressive carbon reduction targets for their building portfolios. Contractors who can demonstrate a track record of using EPDs to select low-carbon concrete will be better positioned to win work from these clients.

Building a Culture of Carbon Transparency

The long-term success of concrete decarbonization depends on widespread adoption of EPDs across the supply chain. When contractors consistently request EPDs, ready-mix producers respond by investing in more low-carbon formulations and obtaining verified declarations. This creates a virtuous cycle: more EPDs lead to greater competition on carbon performance, which drives further innovation and cost reduction.

To stay current with the latest developments in sustainable construction, our coverage of sustainability insights from Greenbuild 2026 offers additional context on industry trends and emerging best practices.

Conclusion

Environmental Product Declarations are not just a documentation requirement. They are a practical tool that empowers contractors to make informed decisions about the concrete they use every day. By understanding how to read EPD data, comparing mixes on carbon performance, and embedding EPD requirements into procurement workflows, contractors can reduce the embodied carbon of their projects while strengthening their competitive position.

The technology and materials exist today to achieve significant reductions. The missing piece is widespread adoption of the practices outlined here. Contractors who lead on carbon transparency will find themselves better prepared for the regulatory environment of tomorrow and better equipped to meet the expectations of increasingly sustainability-focused project owners.