A new LEED pilot credit, Building Material Human Hazard & Exposure Assessment, will award credit to building project teams that incorporate products that have assessed human health-related hazard and exposure for products in their installation and use phases.
Participating in this pilot credit benefits building project teams and product manufacturers alike:
- Project teams can receive a LEED credit for specifying and using materials and products that have undergone a hazard and exposure assessment
- Product manufacturers that complete the hazard and exposure assessment can promote their products to building project teams as a means of earning LEED credits.
Pilot Credit Requirements:
Project teams must use at least five different permanently installed products from at least two different manufacturers that have completed human hazard and exposure assessments and received acceptable risk scores. Project teams must submit product documentation from manufacturers to Green Building Certification, Inc. (GBCI).
The manufacturer must complete a screening-level hazard assessment for each substance in the building product present in concentrations greater than 1,000 parts per million (ppm) for each endpoint listed below:
- Reproductive & Developmental Toxicity
- Acute Toxicity
- Eye & Skin Irritation
- Aspiration Hazard
- Chronic Toxicity: Skin & Respiratory Sensitization
- Specific Target Organ Toxicity (Single Exposure)
- Specific Target Organ Toxicity (Repeated Exposure)
If any of the ingredients are flagged in accordance with GHS Hazard Criteria thresholds, the product will proceed to the Exposure Assessment, described below. If no ingredients are flagged in the hazard assessment, then no exposure assessment is required.
For ingredients flagged as meeting or exceeding designated hazard thresholds in the previous step, manufacturers must perform an Exposure Assessment. This assessment uses established exposure tools to assess occupant and worker exposures during product installation and use.
After selecting the appropriate tool and exposure scenario, manufacturers should input relevant physical chemical properties and model each flagged chemical from the hazard assessment. For the risk calculations to work properly, the exposure scenarios must evaluate the exposure route relevant to the hazard threshold. For example, if the ingredient is a skin irritant, then the assessor would need to run a dermal exposure model.
Data from the exposure model will be used to determine whether a product ingredient is a low risk in the specific application.
The following decision tree illustrates the process assessors can undertake to run products through a hazard and exposure assessment: