I posted this in the insulation section but i need to get some fast answers and i know not a lot of people wander over there so i am going to post it here as well.
I have four of my rooms taken down to bare studs and i am about ready to insulate the exterior walls. I am really like idea of the spray foam but i hate the price. Can i first use 2" XPS board and then 1-1.5 inch of closed cell spray foam to get 3.5" of insulation and still retain the value of spray foam? This may be a stupid question but i have searched and searched and i cant find anything about it anywhere.
I am looking at the DIY spray foam kits and they are around $1400 for 1200 board feet. That comes to about 1.16 per foot not counting waste. Foam board is about $.50 per foot and is closed cell. If this would [COLOR=blue !important][COLOR=blue !important]work[/COLOR][/COLOR] would the spray foam stick to the smooth surface of the XPS?
by the way I am in nashville tn and the home is 1200 sqf main floor and a 1200 sqf basement (70% below grade) all brick/block.
Thanks
Brad
I have four of my rooms taken down to bare studs and i am about ready to insulate the exterior walls. I am really like idea of the spray foam but i hate the price. Can i first use 2" XPS board and then 1-1.5 inch of closed cell spray foam to get 3.5" of insulation and still retain the value of spray foam? This may be a stupid question but i have searched and searched and i cant find anything about it anywhere.
I am looking at the DIY spray foam kits and they are around $1400 for 1200 board feet. That comes to about 1.16 per foot not counting waste. Foam board is about $.50 per foot and is closed cell. If this would [COLOR=blue !important][COLOR=blue !important]work[/COLOR][/COLOR] would the spray foam stick to the smooth surface of the XPS?
by the way I am in nashville tn and the home is 1200 sqf main floor and a 1200 sqf basement (70% below grade) all brick/block.
Thanks
Brad