For recycled content of concrete, I followed the "Sample Supplementary Cementitious Materials Calculation" in the LEED reference guide to find the recycled content value. I put this price in the "Sustainable Criteria Value ($)" column in the Materials Calculator. For our project, we're using the actual cost of materials, not the 0.45 multiplier. In the "Material Cost ($)" column, do we put the cost of the concrete mix or the cost of the cementitious materials only? It seems like putting the cost of concrete would cancel out the reason behind the cementitious materials calculation, but it also seems strange to leave out the cost of the non-cementitious materials (especially if we want to count those toward the regional materials credit). And either way, do we just leave out the pre- and post-consumer content percentage since we're putting a price into the spreadsheet directly?
Thanks,
Roxanne
RETIRED
LEEDuser Expert
623 thumbs up
November 5, 2013 - 2:53 pm
Roxanne - It is unfortunate the Supplementary Cementitious Materials Calculation in the Reference Guide does not jive with BDC Materials and Resource Calculator (Calculator). I recently updated the SCM spreadsheet that I use to mesh with the Calculator for fly ash. I took the last column from the example in the Reference Guide times the number of yards of concrete times two (to overcome pre-consumer reduction) and entered that as the Material Cost ($) in the Calculator. Then I used 100% in the Percent Pre-Consumer column for the Recycled Content to end up with a Sustainable Criteria Value that is 50% of the Materials Cost. If the SCM is local, enter the correct percentage into the Percent Regional column.
I know it seems strange to leave out the costs of the non-cementitious materials but that is how it works for SCMs.
If the rest of the non- cementitious materials are local, you need to enter the remaining cost of them as a separate line item and then enter the correct percentage into the Percent Regional column.