Asphalt shingles may be damaged or punctured when nailed onto a non rigid surface such as roofing insulation.
Roofing shingles and foam insulation.
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Spray foam insulation effect on a shingle roof.
An attic that is properly vented has 50 intake of fresh air and 50 exhaust of the hot air.
Bailes iii phd july 3 2013.
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Nail it around the edges with roofing nails.
The moisture from above they thought comes from rain and dew on the shingles migrating inward and then being forced farther inward during the day by solar vapor drive.
The main concern with spray foam insulation and shingle warranty is proper attic ventilation.
The nail holding ability of the insulation is not adequate.
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Acute temperatures in uninsulated ventilated attics impact comfort and energy efficiency in living spaces below.
Most people do not realize the requirements for proper venting of an attic.
If you do not have proper ventilation you are in essence cooking your shingles.
Start at the bottom of the roof and place the first piece of rigid foam insulation against the metal flashing starting at the center line.
It hits the osb roof sheathing and keeps going through the foam into the attic air.