Question: Tyler asks: I have a certification letter from a manufacturer that states “We use recycled steel in making our ductile iron: 8% ASTM A36 carbon steel, 27% 1010 slitter steel and 50% scrap ductile iron from our own processing. We use both pre-consumer and post-consumer material.” I have verified from them that the slitter steel is a waste product from another manufacturing process. My question is can I determine the pre-consumer and post-consumer material percentages based on the above data?
For steel products where no recycled content information is given, or unclear, assume the recycled content is to be 25 percent post-consumer, as stated by LEEDs V3 Building Design and Construction Manual.
There is also Equation 3 under this manual, that will help you calculate the assembled recycled content which requires assembly weights, costs and recycled content.
As an experienced LEED documenter, I would suggest gathering all items for this credit, and if you are at a point where clarifying this documentation will earn you extra percentages to obtain either 1 or 2 points – then work with the manufacturer to better understand where everything is coming from and why.