question for the contractors out there, R11 vs R13 insulation

[fishinpox]

Originally Posted by marty f

If you want the best R go with spray foam, there are do it your self kits out there. Ill be doing my own.

Not true
Open cell spray foam @ 3.5" ( 2x4) wall is r-13 . You can achieve r15 with blown fiberglass product called "assure-r" @ 3.5" thick

But

You will get a better seal with the spray foam than you will with the blown fiberglass


Another thing with spray foam is the majority of installers and the majority of Hvac contractors don't know how to properly install / mix product or properly design a Hvac system that works with a sealed envelope