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Choose low-carbon, durable materials for a new home by starting with what each assembly must do, then comparing functionally equivalent options using product-specific environmental product declarations (EPDs) or a whole-building life-cycle assessment (LCA). The lowest upfront carbon figure is not automatically the best choice: performance, climate exposure, maintenance, and replacement all matter. A sound decision weighs these factors together rather than treating a material’s carbon number as a stand-alone verdict.
What should you decide before comparing materials?
Write down the requirements for each assembly before choosing products. A wall, roof, foundation, floor, or structural frame has a job to do; alternatives only make sense to compare when they can meet the same project requirements. Depending on the assembly, those may include structural capacity, fire safety, thermal performance, and control of heat, air, and moisture.
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State the requirements in terms the design team can verify. For a structural element, that may mean the specified capacity and exposure class. For an exterior wall or roof, it may include thermal resistance, water control, air control, drying potential, and fire performance. For finishes or cladding, maintenance access and resistance to the local weather may be central. This short performance brief prevents a product with an attractive carbon figure from being treated as an equivalent substitute when it performs a different job.
This is not a trade-off between carbon and safety. ASHRAE advises that embodied carbon be considered alongside fire safety, in-service performance, and durability when selecting materials and systems for low-carbon buildings. Its 2025 Handbook chapter on heat, air, and moisture control describes why material properties and the conditions within an assembly matter.
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Also look for opportunities to avoid unnecessary material. The U.S. Department of Energy’s Embodied Carbon Reduction in New Construction reference guide treats embodied carbon as a lifecycle issue and notes that reducing the amount of building constructed can reduce embodied carbon. In practical terms, ask the design team whether the same function can be delivered with a simpler design or less material, without compromising required performance. Efficient planning, appropriate spans, and avoiding over-specification can matter before a product comparison even begins.
What do EPDs and LCAs tell you?
An EPD discloses environmental impacts for a particular product under stated rules and within a stated lifecycle scope. It is useful evidence, but it is not a universal grade that identifies the best product for every home. The EPA compares an EPD to a nutrition label: it reports information about the product, rather than making the choice for you. See the agency’s guide to reducing embodied greenhouse gas emissions from construction materials and products.
Read an EPD as a defined claim, not as a promise about an entire material category. It describes the declared product, the quantity or function used as the basis for reporting, the product-category rules (PCR) used to prepare the declaration, and the lifecycle stages included. If any of those boundaries differ between two documents, their numbers may answer different questions. Keep the EPD with the specification so the product eventually delivered can be checked against the evidence used for selection.
An LCA, or life-cycle assessment, is a method for measuring environmental impacts over the life of a product, process, or building. The DOE defines it as measuring impacts “from raw material extraction through end-of-life and disposal.” A product-level LCA may support an EPD; a whole-building LCA can assess the combined effects of material and design choices. The U.S. General Services Administration’s overview of LCA and buildings explains the building-level context.
In short, use an EPD when comparing products that perform the same function in a comparable way. If a material change alters the design of the wall, roof, floor, or structure, compare complete assemblies or design options with an appropriate whole-building LCA instead of treating two isolated product figures as equivalent. A whole-building assessment can capture knock-on changes such as additional framing, layers, connectors, or replacement needs that a product-only figure will not show.
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How do you compare EPDs fairly?
Two EPDs are not automatically comparable because both show environmental data. Check their basis and scope before drawing a conclusion. The AIA and Carbon Leadership Forum’s Embodied Carbon Toolkit for Architects, Part II calls for functionally equivalent products, the same product category rules (PCR), and the same lifecycle stages when making a fair comparison.
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- Check the declared or functional unit. Find out what quantity or function the EPD reports. If the units differ, the figures cannot be read as a direct head-to-head result without an appropriate conversion or analysis. For building choices, the function of the assembly may be more informative than the amount of product alone.
- Check the PCR basis. Product category rules define how an EPD is prepared for a product category. Make sure the declarations use the same PCR basis, or treat differences as a limitation rather than assuming the results align.
- Match the lifecycle stages. See which lifecycle modules are included in each declaration. If one EPD covers different stages from another, a difference in reported impact may reflect the scope, not simply a better or worse product.
- Read the product and plant details. Confirm that a declaration relates to the specific product under consideration and, where relevant, the manufacturing plant. A generic declaration may not represent the product or source being proposed for the home.
- Look beyond one number. EPDs may report multiple environmental indicators. A lower global warming potential (GWP) figure does not, by itself, establish that a product has lower impacts in every other category.
GWP is a measure of a product’s contribution to global warming over the scope the EPD reports. When comparing it, first confirm that the product function, unit, PCR basis, and lifecycle boundaries match. If they do not, ask the design team or supplier to explain the difference or use a broader assessment suited to the decision.
Do not compare a value per mass of material with a value per area of finished assembly as though they were identical. First determine how much of each product is needed to deliver the specified function. The same caution applies when one option requires auxiliary layers or a different thickness. A fair comparison may require the architect or engineer to translate product data into an assembly quantity before calculating the impact of the design.
How should service life and climate affect your choice?
Consider the material in the assembly and climate where it will actually serve—not just as a product on a data sheet. Moisture loads, the assembly’s ability to dry, and other service conditions can affect performance and durability. ASHRAE’s building-envelope guidance and its more recent material-properties chapter provide context for evaluating envelope conditions and moisture-related performance.
Climate exposure should be discussed in practical terms: where water can enter, how quickly layers can dry, and whether heat and air movement create conditions that accelerate deterioration. A material that performs well in one enclosure may need a different detailing or maintenance approach in another. Durability is therefore a property of the product and its installation, not a label that can be assigned to a material name alone.
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Include expected maintenance and replacement over the assumed service life of the home. A product comparison focused only on initial manufacture can miss impacts associated with replacing or maintaining materials later. The U.S. Green Building Council’s building life-cycle impact reduction guidance includes maintenance and replacement in lifecycle considerations. The service-life period used in an assessment is an assumption in the method, not a guarantee about how long every product or home will last.
Ask what evidence supports a durability or lifespan assumption for the proposed product and its specific application. Then consider whether the assembly design and exposure conditions support that expectation. Avoid assigning a universal service life to a material category: product, installation, maintenance, climate, and assembly conditions can differ. Record who will maintain the component, how it can be inspected, and what would trigger repair or replacement so those assumptions are visible in the LCA or comparison.
What should you ask about concrete, steel, wood, and insulation?
Use material-specific questions to gather evidence, not to assume that one category is always the low-carbon or long-lasting option. The DOE’s Low Embodied Carbon Tenant Fit-Out Guide identifies strategies to investigate for concrete, steel, and wood; the project-specific product, plant, and application still need to be considered.
- Concrete: Can the proposed mix meet the specified strength and exposure requirements with less cement, Portland limestone cement, or suitable supplementary cementitious materials? Request the plant-specific EPD and check its declared unit and lifecycle scope. Ask whether the lower-cement design changes curing, schedule, or other required performance. A strategy is worth considering only if it meets the project specification and the EPD supports the comparison.
- Steel: Ask about recycled content and the production route, including whether electric arc furnace production is relevant to the product being proposed. Request an EPD for the relevant product and plant; a broad claim about recycled content is not a substitute for an apples-to-apples comparison. Confirm that the reported product is the same grade and form needed for the design.
- Wood: Ask whether reclaimed wood or wood from a responsibly managed, certified source is appropriate and documented. Then confirm that the proposed assembly meets structural, moisture, fire, and maintenance requirements. A sourcing attribute alone does not establish that the assembly is suitable or durable.
- Insulation and other envelope layers: Compare options that provide equivalent thermal performance, and consider how the entire assembly manages heat, air, and moisture. Comparing products only by mass or area can be misleading when they deliver different thermal functions. Check whether changing insulation alters thickness, framing, vapor control, or drying behavior.
These questions help a homeowner and design team turn broad claims into project evidence. For any material, ask for documentation tied to the actual product, source, function, and installation context—not just a category-level statement. If a supplier proposes a substitute after specification, repeat the comparison rather than assuming the replacement has the same impacts or durability.
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What is a practical selection process for a new home?
Use this sequence with the architect, builder, or other design professionals responsible for the assemblies. It keeps the choice focused on the home’s requirements and makes the evidence easier to review.
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- List the assemblies and required functions. Identify the components under consideration—such as the foundation, structure, envelope, and roof—and record the performance requirements each must satisfy.
- Look for ways to reduce demand. Before selecting a lower-impact product, ask whether the design can meet its purpose with less construction or material. Keep required safety and in-service performance intact.
- Ask for comparable product evidence. For functionally equivalent products, request current, product-specific EPDs. Note the manufacturer and plant where available, the declared unit, PCR basis, lifecycle stages, and reported GWP.
- Check whether the alternatives are truly equivalent. If a proposed substitution changes the assembly or its performance, do not rank the products by isolated EPD figures. Ask the design team to compare complete assemblies or design options using a suitable LCA.
- Review durability for the actual exposure. Discuss climate, moisture loads, drying potential, maintenance, and likely replacement needs for the proposed assembly. Make the service-life assumptions explicit.
- Compare other relevant impacts. Review additional EPD indicators where they matter to the decision. Do not describe a carbon reduction as an overall environmental improvement without checking the relevant impacts.
- Verify procurement. Keep the selected product, plant information, and EPD with the specification. When submittals arrive, check that the proposed product is the one evaluated; a different source may require a new comparison.
- Record the decision and its basis. Keep a short comparison showing the requirements, evidence, scope limitations, maintenance assumptions, and reason for selecting an option. This makes it easier to check that the specified product is the one ultimately supplied.
A simple comparison sheet can be more useful than a list of product carbon numbers:
| Question | What to record |
|---|---|
| Does it perform the same function? | Required performance and how each option meets it |
| What does the EPD cover? | Product, plant, unit, PCR basis, lifecycle modules, and reported indicators |
| What changes in the assembly? | Whether the substitution affects other materials, design, or performance |
| How is durability addressed? | Exposure, moisture and drying conditions, maintenance, and replacement assumptions |
| What happens at procurement? | Whether the specified product and source match the submitted product |
| What is the basis for the decision? | Product or assembly comparison used, limitations, and selected option |
What are the most common comparison mistakes?
The most consequential mistake is treating a single EPD number as a universal ranking. A number only has meaning in the context of the product function, unit, PCR, lifecycle stages, and application it represents.
- Comparing different functions: A lower-impact product is not a fair alternative if it cannot deliver the required performance. Define the job first.
- Comparing different units: A mass-based result and an area- or function-based result cannot be read directly against each other. Convert or assess the complete assembly.
- Ignoring lifecycle boundaries: EPDs with different included stages may not support a direct comparison. Match scope or explain the limitation.
- Using a generic declaration for a specific purchase: Manufacturing route and plant can affect the result. Ask whether the declaration represents the product actually available for the project.
- Choosing by upfront impact alone: Maintenance and replacement during the home’s assumed service life can affect lifecycle impacts. Include those expectations rather than assuming the initial figure answers everything.
- Ignoring moisture and exposure: A material’s performance depends in part on how the assembly handles its service conditions. Review moisture loads and drying potential as part of durability.
- Overlooking design knock-on effects: A substitution can change thickness, framing, connectors, or other layers. Use an assembly or building comparison when those effects are material to the decision.
- Overgeneralizing from examples: An illustrative concrete EPD in EPA guidance demonstrates how an EPD presents information; it is not a benchmark for all concrete or a cross-material ranking.
- Assuming a category winner: The available guidance does not establish that wood, concrete, steel, or a particular insulation type is always lowest-carbon or most durable. The answer depends on the product, plant, assembly, climate, service-life assumptions, and scope of evidence.
The DOE’s reference guide, the AIA-CLF comparison toolkit, and the EPA’s construction materials emissions resources are useful starting points for discussing methods and evidence. None turns a category-level claim into a project-specific result.
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How do you make the final decision?
Prefer the option that meets the home’s requirements and has the strongest relevant evidence for its carbon impact and expected service in the proposed assembly. If two products have comparable function and their EPDs align in unit, PCR, and lifecycle scope, the reported impacts can inform the choice. If they do not, compare the assemblies or seek a whole-building LCA rather than forcing a product-level ranking.
Before approving a selection, confirm that the comparison includes required performance, product-specific documentation, climate and moisture exposure, maintenance, and replacement assumptions. That process supports a defensible choice without pretending that one material is best for every home. Revisit the decision if the design, supplier, plant, or assembly changes; the evidence should follow the actual home being built.
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Frequently Asked Questions
Does a higher recycled-content percentage automatically mean a lower-carbon material?
No. Recycled content is one detail to investigate, but it does not replace an EPD-based comparison of equivalent products with aligned lifecycle scope. Ask for the documentation for the specific product and source being proposed.
What is the difference between a declared unit and a functional unit?
A declared unit reports impacts for a stated quantity of product, while a functional unit relates impacts to the function being delivered. Check which basis an EPD uses; different bases require careful conversion or an assembly-level analysis before comparison.
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When should I request a whole-building LCA instead of comparing EPDs?
Request an assembly or whole-building LCA when changing the product changes the wall, roof, floor, structure, thickness, supporting materials, or required performance. The broader assessment can capture those linked effects.
How should moisture affect a low-carbon material choice?
Review moisture loads, drying potential, and the conditions the material will experience in the proposed assembly and climate. A product’s category label does not establish durability if the enclosure cannot manage its exposure.
Who can help interpret an EPD for a home project?
An architect, builder, or design professional coordinating the relevant assembly can help check whether the EPD matches the product function and project requirements. For a substitution that changes the design, ask whether an assembly-level or whole-building LCA is more appropriate.
The Bottom Line
Choose the material that performs the required job, works with the home’s climate and assembly, and has credible product-specific lifecycle evidence. Use aligned EPDs for equivalent products; use an assembly or whole-building LCA when the design changes. Include maintenance, replacement, and other relevant impacts before approving the specification.
