Hello,

We are using Tally, the program by Kieran Timberlake, to complete our Life Cycle Assessment for LEED. Our engineers tell us that the best they can do, due to scheduling conflicts, is produce a concrete mix design with 15% fly ash. However Tally only gives us fly ash options in the form of 25%, 30% and 50%. That being said we have run into a wall because we are unsure how to proceed. Now, there is a text box on the LEED form for "Special Circumstances" though we are unsure, it is our first time doing LCA in our office, if we need to put our circumstance in detail in the "Special circumstances" box or if we need to contact Kieran Timberlake to express the need for more fly ash options in tally and our current predicament. Any help would be much appreciated.