Rating System

LEED BD+C: New Construction, LEED BD+C: New Construction, LEED BD+C: New Construction, LEED BD+C: New Construction, LEED BD+C: Schools, LEED BD+C: Schools, LEED ID+C: Commercial Interiors, LEED ID+C: Commercial Interiors, LEED BD+C: Core and Shell, LEED BD+C: Core and Shell

Rating System Version

v2 - LEED 2.0, v2 - LEED 2.2, v2 - LEED 2.2, v3 - LEED 2009, v2 - Schools 2007, v3 - LEED 2009, v2 - LEED 2.0, v3 - LEED 2009, v2 - LEED 2.0, v3 - LEED 2009

Inquiry

One of the most significant materials we have specified for this project is a wall system that is comprised of recycled polystyrene embedded in a Portland cement matrix cast into panels to provide both structural support, and a high insulation value. This system (Perform Wall) has an average weight per panel (10"x15"x10\') of 156 lbs. Because polystyrene is so much lighter than cement, the polystyrene within the panel only weighs 37lbs, but comprises 85% of the panel by volume. We have this information documented from the manufacturer. To calculate the percentage of recycled material based on the criteria of weight only, the polystyrene would only be 24 % of the total weight, while the manufacturer states that the polystyrene is 85% of the product volume. We believe we have followed the design intent by specifying a product with a high percentage of recycled content, and would like to be granted an exception to the calculation method and be permitted to utilize the 85% for submittal purposes. We will include the manufacturer\'s information in the submittal.