Misinformation on a couple of threads. I built a custom home in Georgia and I used this closed cell foam in my attic and walls and my attic (5500 sq ft home) was always 70 degrees in the attic.
The 2 posts above that had misinformation were the ones that said you still needed a ridge vent and baffle. NOT TRUE! The foam was sprayed directly onto the plywood in the attic and in each cavity between the studs in the walls. I know, I watched them spray it.
I had no vents at all, it was a completely sealed attic: no ridge vents, no soffit vents, no can vents, no builders gap. I also had a friend that put this in his exiting home and the 1st thing they did was to seal his whole attic: take out all the vents.
There are 2 types of foam and there is a big difference in price, the closed cell being the most expensive. And yes, if you develop a leak, you won’t know it for a long time if it’s closed cell because it’s so dense, it will have to soak thru all this foam then onto your drywall in the ceiling before noticing you got a leak.
If I built a new home, I would definitely put it in because it’s too big of an expense sealing all the vents/soffits before spraying
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