Mountain Man
Senior Member
I've done a building with the prescriptive path, and the cost for me to go and calculate the RSI value for each component of the cladding as well as the cost of the extra insulation required everywhere (mostly at the parkade) came out to about 2x what the energy model cost lol. That developer did that method once, then smartened up quick.That is true if you are using the modeling (performance) pathway but not if you are using the trade off or the prescriptive pathways. If a developer is smart, they will do exactly as you mentioned above but some of them get caught up in the cost of the model (I know, this makes no sense), and then outboard insulation because one of their better options.