Building-product disclosure gives architects, specifiers, contractors and owners evidence about what materials contain and how they affect the environment across their life cycles. The two principal tools discussed in the original 2014 Building Enclosure article are Environmental Product Declarations (EPDs) and Health Product Declarations (HPDs).
Neither document is a “green” or “safe” label. An EPD quantifies selected environmental impacts using life-cycle assessment; an HPD identifies ingredients and screens them against hazard lists. Used with performance requirements, project conditions and current rating-system rules, they replace some guesswork with structured evidence without pretending that a single score settles a product decision.
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Why disclosure matters in a building project
Energy use and recycled-content percentages answer only part of a material-selection question. A product can perform well on one attribute while creating burdens elsewhere in manufacturing, transport, installation, use or disposal. Designers also need to know what goes into a product and whether any ingredients are associated with recognized health hazards.
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- Do we have the kind and quality of information about building products needed to make an informed decision?
- What goes into the materials we are specifying, and how might a product affect occupant safety, health and wellbeing?
The answer is not a universal product ranking. It is a documented comparison in which the team checks whether the products serve the same function, whether the evidence covers the same scope and whether the information is current and independently verified.
Jim Hoff’s February 21, 2014 article, “Disclosure: The Newest Dimension in Green Building,” presented disclosure as an emerging practice. Its central warning still applies: a headline environmental percentage or a hazard flag can hide trade-offs when considered without context.
What an Environmental Product Declaration (EPD) tells you
Life-cycle impacts, not a pass/fail grade
An EPD is a standardized environmental statement based on life-cycle assessment (LCA). It reports quantified inputs and outputs for a defined product and a defined set of life-cycle stages. Depending on the declaration, categories can include global-warming-related emissions, energy and resource use, water consumption and waste.
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The result is a set of impact indicators, not a certification that a product is environmentally preferable. An EPD can reveal burdens that a marketing claim leaves out, but it does not decide whether those burdens are acceptable for a particular project. Durability, thermal performance, maintenance, installation waste and end-of-life options may also affect the decision.
System boundaries determine what the numbers mean
Every EPD states a system boundary. A cradle-to-gate declaration generally covers extraction and processing of raw materials through manufacturing and the point at which the product leaves the factory. A broader declaration may include transport to the site, installation, use, maintenance, replacement and disposal. Two values cannot be compared fairly if one includes stages that the other excludes.
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USGBC’s Building Product Disclosure and Optimization—EPD Guide describes an EPD for the referenced LEED credit as having a scope of at least cradle-to-gate. The guide identifies ISO 14025, ISO 14040, ISO 14044 and either EN 15804 or ISO 21930 among the applicable standards for that credit. Those requirements are credit-specific; they are not a universal rule for every rating system, product category or project location.
Read the declared unit and product category rules
An EPD reports impacts against a declared or functional unit, such as a mass, area, volume or service provided for a specified period. A comparison is meaningful only when the units represent the same function. Comparing one square metre of a floor finish with one kilogram of another material, without converting them to an equivalent performance basis, can produce a misleading result.
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Information to record from every EPD
- Product name, manufacturer, model or formulation and intended function.
- Declared or functional unit and reference service life, if stated.
- Life-cycle modules and system boundary.
- Impact categories reported, including global warming potential and resource or energy indicators where provided.
- Geographic and manufacturing representativeness.
- PCR, LCA standards and program operator.
- Whether a third party verified the declaration.
- Publication date, validity period and any version or amendment.
These details belong in the project record. A single number copied into a spreadsheet without its unit and boundary is not a usable comparison.
What a Health Product Declaration (HPD) tells you
Ingredient disclosure and hazard screening
An HPD identifies product ingredients, often by chemical name, percentage range and role, and screens them against reference lists for known or suspected health hazards. It can show that a formulation contains a substance appearing on a recognized carcinogen, reproductive-toxicity or other hazard list, or that a manufacturer has not disclosed an ingredient because of proprietary restrictions.
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The document supports a more informed conversation among the design team, manufacturer, contractor, facilities staff and occupants. It can also reveal where additional documentation, substitution analysis or exposure controls are warranted.
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An HPD is not a risk assessment
Hazard describes an inherent ability to cause harm under some conditions. Risk depends on exposure: dose, route, frequency, duration, concentration and the way a product is installed and used. An HPD generally does not model indoor-air concentrations, worker tasks, occupant exposure or the effects of a complete assembly.
Therefore, a hazard flag must not be translated automatically into “unsafe,” and the absence of a listed hazard must not be translated into “safe.” Chemical mixtures, impurities, reaction products and changes during curing or weathering may require separate technical review. Safety Data Sheets can provide handling information, but they are not substitutes for an HPD or a full exposure assessment.
Questions to ask when reviewing an HPD
- Is the disclosure complete to the stated threshold, or are some ingredients withheld as proprietary?
- Which hazard lists and list versions were used?
- Are ingredients reported as individual substances, ranges or generic families?
- Does the document describe the product as sold, or a cured, dried or installed form?
- Are impurities, residual monomers, catalysts and reaction products addressed?
- What date, expiration period and verification process apply?
Hoff’s article also discussed a proposed Product Transparency Declaration and the role of Safety Data Sheets as historical alternatives. Those references describe the debate of 2014, not a current status report or a replacement for today’s project requirements.
EPD and HPD answer different questions
| Comparison point | EPD | HPD |
|---|---|---|
| Primary question | What environmental impacts are associated with a product over defined life-cycle stages? | What ingredients are in the product, and which disclosed ingredients appear on hazard reference lists? |
| Method | Life-cycle assessment governed by stated standards and product category rules. | Ingredient inventory and hazard-list screening. |
| Typical outputs | Global warming potential, energy or resource use, water and waste indicators, depending on the declaration. | Chemical names or families, concentration ranges, roles and hazard-list results. |
| What it does not establish by itself | That the product is the best environmental choice, safest, most durable or lowest-impact in every application. | Actual occupant or worker exposure, dose, risk or overall product safety. |
| Best use in design | Compare environmental performance of functionally equivalent products with matching scope and units. | Identify ingredients requiring further review and improve material transparency. |
How to compare two products without creating a false ranking
- Confirm the function. Compare products that provide the same service in the same assembly. A lower impact per kilogram is not meaningful if the product requires twice as much material or has a shorter service life.
- Align the declared unit. Convert results to a common functional basis only when the performance assumptions support that conversion.
- Match life-cycle stages. Check whether both EPDs are cradle-to-gate, cradle-to-gate with options, or cradle-to-grave. Do not compare a factory-gate value with a full-life-cycle value as though they were equivalent.
- Check PCR and standards. Record the PCR version and whether the declarations use EN 15804, ISO 21930 or another applicable framework. Different rules can change assumptions and allocation.
- Check geography and energy data. Manufacturing location, electricity mix, transport distance and regional background data affect results. A declaration from one market may not represent a project in another.
- Distinguish product-specific from average data. Industry-average declarations can be useful when no product-specific EPD exists, but they do not have the same representativeness as data for the exact formulation and plant.
- Verify the document. Note the program operator, independent verifier, issue date, validity and any amendments. An expired or superseded document should not be treated as current evidence.
- Interpret all relevant indicators together. A product with lower global warming potential may have higher water use or resource depletion. Review the project priorities rather than selecting on one metric.
- Use HPD information separately. Ingredient hazard screening is not an environmental impact score. Keep health and environmental evidence in separate fields, then consider both alongside performance and exposure controls.
- Document the decision. Record the competing products, assumptions, excluded data, required performance and the reason the selected option fits the project.
Using disclosure with LEED today
The LEED names, thresholds and product-count rules described in the 2014 article were tied to LEED v4 at that time. They should not be presented as current compliance advice.
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USGBC now publishes LEED v5 resources, and its current product-documentation resource recognizes several documentation approaches, including EPDs and HPDs as well as other declarations and certifications. USGBC’s rating-system selection guidance lists LEED v5, v4.1 and v4 as open for registration at the time of retrieval. Registration status and credit requirements can change, so a project team must confirm the rating system under which its project is registered and follow that system’s current reference guide and credit language.
For a USGBC project, treat an EPD or HPD as documentation that may support a specific credit pathway, not as a blanket approval. Check the applicable credit’s definition of acceptable scope, verification, product categories, quantity and disclosure content. A document that is useful for material selection may not satisfy a particular credit, and a document that satisfies a credit does not automatically make a product the best technical choice.
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At schematic design
Set the information requirements before products are named. Decide which assemblies need EPDs, HPDs or both; establish minimum performance; identify regional or project-specific priorities; and ask manufacturers for current documents, PCR details and verification statements.
During specification
Write disclosure requirements into the specification with the exact document type, validity date, scope and product identity required. Allow equivalent documentation only when it can be evaluated against the same criteria. Coordinate substitutions so that a replacement product does not silently lose the environmental or ingredient information used in the design decision.
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Confirm that the delivered product matches the disclosed formulation and manufacturing location. Keep declarations, HPDs, safety documents and substitution approvals in the project closeout record. If a field-applied coating, adhesive or sealant changes the assembly, request documentation for that product rather than assuming the original declaration covers it.
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Common mistakes and how to correct them
- “The lowest carbon number wins.” Correct it by checking functional equivalence, service life, all reported impact categories and the project’s actual use conditions.
- “An EPD proves the product is green.” Correct it by describing the EPD as quantified, method-dependent evidence rather than a rating.
- “An HPD proves a product is safe.” Correct it by separating ingredient hazard from exposure and risk, then obtaining industrial-hygiene or toxicology advice when the use case warrants it.
- “An undisclosed ingredient is automatically dangerous.” Correct it by identifying what is unknown, why it is withheld and what additional manufacturer or regulatory information is available.
- “Any EPD can be compared with any other.” Correct it by matching unit, PCR, boundary, geography, product category and validity.
- “The 2014 LEED numbers still apply.” Correct it by checking the project’s registration version and the current USGBC credit documentation.
What disclosure can—and cannot—do for decision-makers
Disclosure is strongest when it makes assumptions visible. It can expose the difference between a product-specific result and an industry average, show whether transport or end-of-life stages were omitted, and identify ingredients that deserve further review. It can also improve manufacturer accountability by making missing data apparent.
Disclosure is weaker when documents are treated as interchangeable scores. LCA results depend on modeling choices; HPD results depend on the completeness of ingredient reporting and the hazard lists selected. Neither document replaces code compliance, durability analysis, specification review, indoor-air-quality planning, worker protection or a product’s required technical performance.
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Bottom line for green-building teams
EPDs and HPDs make building-product decisions more transparent, but they answer different questions. Use EPDs to examine quantified life-cycle impacts and HPDs to understand ingredients and hazard-list screening. Compare only functionally equivalent products with matching units, boundaries, standards, geography and validity. Then apply the evidence alongside performance, exposure, durability, cost and the current requirements of the project’s rating system.
As Hoff concluded in 2014, “Perhaps the best recommendation going forward is to be proactive in the process—but cautious with the results.” That remains a sound rule for any team using disclosure to make a consequential material choice.
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