There is a lot of research already done on building insulation, spray foam is not necessary above grade, but can be used.Jamal79 wrote: ↑Nov 5th, 2015 4:53 pmThank you. I will inquire.
I guess it's quite difficult to really determine energy savings. The only real way would be to build 2 identical homes in the same area, occupied by the same number of people who lead identical lifestyles. Only difference being one with batt and one spray foam.
To get the best performance you want an air barrier with your insulation (which spray foam can provide but so does wood and drywall if done properly). The advantage to spray foam is that it can compensate for poor construction practices if its installed correctly. If its not installed perfectly then its not compensating for anything.
Air leakage and insulation are related but different concepts.
I posted a fair bit of information on this here
ask-me-anything-about-energy-efficiency ... st23817201
In addition you can model energy requirements of a house, there is free software called Hot2000 that can do this for you (but its meant for professionals so there is a learning curve involved) and there have been duplicate homes built and energy loss and different technologies measured, its been done.