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How to Apply Spray Foam onto a Low-Slope Roof?

How to Apply Spray Foam onto a Low-Slope Roof?


   
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Old 08-01-21, 09:49 AM
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How to Apply Spray Foam onto a Low-Slope Roof?
I need information on how to apply spray Foam onto a Low-Slope roof. I don't need to do the whole roof, just small parts of it. Let me explain:

I am removing 3 leaking skylights on my roof, and after I frame the openings (see pic), I will cover the openings with plywood, and seal the cracks with roofing cement. Then I plan on covering 12-18" beyond the patch, in all directions, with "90 weight" tar paper, nailed down with #12 x 1 in. Plastic Round Cap Roofing Nails:

https://www.homedepot.com/p/Grip-Rit...111688#overlay

https://www.homedepot.com/p/3-ft-x-3...oduct-overview

The tar paper will cover and overlap whatever underlayment is already on my roof. I plan to seal the roofing nails and the edges of the tar paper, with the roofing cement. But then I will need to spray foam on all three skylight patches, to replace the foam I need to remove, to put the patch in. I could either do the job myself, if given enough information, or hire someone to do the job.

Any good advice is greatly appreciated, and have a great day!

 
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Old 08-01-21, 10:44 AM
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Spray foam on top of the roof ?
Very doubtful. There would be no way to maintain a standard thickness.
You'd have to use a sheet goods product.
 
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Old 08-01-21, 10:46 AM
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Google froth-pak!
 
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Paul678 voted this post useful.
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Old 08-02-21, 07:12 AM
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Google froth-pak!
That's EXACTLY what I am looking for! Wow!

https://www.lowes.com/pd/Dow-FROTH-P...n-Kit/50375630

Thanks a Million, Marq1! You da MAN!
 
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Old 08-02-21, 08:02 AM
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Spray foam on top of the roof ?
Very doubtful. There would be no way to maintain a standard thickness.
You'd have to use a sheet goods product.
Well, you bring up a good point too. The foam thickness is hard to control.

Can I buy foam sheets of about 1/2 inch thick, that will survive on a roof, in the Arizona heat, after they have been coated with 2 coats of elastomeric coating?
 
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Old 08-02-21, 03:21 PM
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So I'm wondering if this foam board would survive in the Arizona Sun,
after being coated two times with elastomeric coating??

https://www.homedepot.com/p/Owens-Co...20WE/207179253
 
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