city threw me a curve today. I called and explained how I was going to do this including electrical. Inspector says sounds like a good plan and should work well.
I glue bottom 2 foot of 2 inch foam on half the house and the phone rings. Inspector says whats the r value of the foam. Its R-10. He says has to be minimum of R-14. So I said have to add another layer of 3/4 then. Well IF you glue 2 " to wall,3/4" to that, and drywall to that, the manufacturer (Owens Corning ) has to certify its a allowed acceptable use of their product. OR a structural engineer to sign off on it!!! 20 years ago that cost min of 750 bucks.
Only way its automatic to the city is to 'stud' the wall inside the first layer of foam. Not knowing I had some on already he says glue 1" to wall,,,then stud and put insulation in stud bay.
Putting 3/4 or 1" inside a 3 1/2 " wall seems goofy waste. Thought of asking if I put studs on flat...or use 1 X 3 firing strips BUT in any event the extra 4 r value is not continuous, broken by fir or stud.
Next problem is new heat ducts are close to blocks in places and NO room for any of this,,,then what??? Maybe I can alter some of them to make room.
This is turning into a nightmare OR huge learning curve, whichever comes first!!! What am I missing??Any suggestions???