Spray Foam Roof Underside Or Between Ceiling Joists - Insulation - Page 2 - DIY Chatroom Home Improvement Forum

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Old 07-11-2019, 11:00 AM   #16
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Re: Spray Foam Roof Underside or Between Ceiling Joists

Originally Posted by RustyRealtor View Post
I like the foam board idea. If I use four 2" pieces of the pink stuff I would have R-40 above the Pex. I just need the inspector's blessing. Then I will use rolled or blown-in insulation everywhere else. And I will spray foam the inside of the brick walls and leave the roof decking uninsulated

I think Yodaman's video concludes that a ridge vent is the way to go. But I don't have overhangs, so I'm not sure how to get air into the attic - especially with gutters. It used to said, by some, that ridge vents and gable vents don't work well together. Any thoughts on that? We dont have much snow in these parts,
If you had a new roof in the near future, there are drip edge vents smart vent that go just under the first shingles. I have seen a row of box vents but that doesn't look good on the front of a house. Maybe some gable vents but low triangles close to the soffet at the corners. Just above the insulation.

We have been building houses with in 6 ft of each other. That puts the gutters 5 ft apart then we can't have vented soffet. so they wrap a skirt roof around the front and back and that is where the venting comes from.
I'm not sure it works but that is what they want. What ever you do, you want more low than what you have up high.
Do not use flat bottom gables with scissor trusses.
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Old 07-11-2019, 11:26 AM   #17
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Re: Spray Foam Roof Underside or Between Ceiling Joists

There are shingle vents that could be installed for intake vent, but like Neil said, it is best if done during a re-shingle project.

There are several MFG's that make them. Lomanco, and Certainteed come to mind.

Combined with pan vents or spinner vents for exhaust could solve your issue.
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