For the LEED AP ID+C V4 Materials and Resources Credit, under Interiors Life Cycle Impact Reduction, Option 1: Interior Reuse, hazardous materials that are remediated as part of the project must be excluded from the calculation. This ensures that the assessment of reused materials does not inadvertently promote the retention of hazardous substances in the interior space.
References: The information is based on the guidelines provided by the U.S. Green Building Council, specifically for the LEED v4 Interior Design and Construction rating system, which outlines the exclusion of hazardous materials from life cycle impact calculations1.