Insulation/Spray Foam

[timmymac24]

I did what strousek did here in zone 5 after a lightning strike and attic fire in April 2024. We did spray and batt combo in exterior walls. The best improvement was having sill areas in basement sprayed that made a huge improvement. 2/3 of my Morton building has spray on the interior roof along with radiant floor heat. I keep it set at 55 in there and it's pretty efficient for the space that gets heated.

 

[Roofer1]

In the process of working this same issue out. The foam guy I got a price from said for our area the minimum he'd spray on walls was 3". Said that get it past the minimum R value for code and past any point he's seen with condensation within walls. Believe I'll do that and have the roof blown in.

 

[WeiserBucks]

What kind of pricing have you guys seen?

 

[Roofer1]

What kind of pricing have you guys seen?

I was told $1.35/SF per inch of thickness for closed cell

side note: apparently 300 is the magic # to become a WKR!!! nice...

 

[CMF]

This is for roughly 1850sq/ft living, 12' ceilings living/kitchen, 9ft ceilings everywhere else. Floor because it's a raised house on pilings.
I just asked for a spray foam quote and didn't specify any thickness or type and this is what they quoted.

 

[woods89]

I think a shop is one of the best uses of foam. I'm quite partial to closed cell over open.

If the space being insulated is being conditioned, make sure your HVAC guys know exactly what you are doing, as in some cases ventilation equipment may need to be added.

In southern MO where I live, we have quite a few local foam installers spraying open cell on roof decks. This makes me a little nervous, as there are some situations where open cell can load up with moisture against the roof deck and rot roof sheathing from the bottom side. If I were doing an insulated roof deck I'd prefer to see closed cell, and keep a close eye on attic humidity.

Buildings are a system. Whatever merit individual products have can be totally undermined by them being incompatible with other parts of the system.