The nail holding ability of the insulation is not adequate.
Roofing shingles and foam insulation.
An attic that is properly vented has 50 intake of fresh air and 50 exhaust of the hot air.
If you do not have proper ventilation you are in essence cooking your shingles.
Consequently shingle damage and or blow off may occur if shingles are applied directly to insulation.
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Most people do not realize the requirements for proper venting of an attic.
Asphalt shingles may be damaged or punctured when nailed onto a non rigid surface such as roofing insulation.
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Research from florida shows that shingles don t get much hotter with spray foam insulation under the roof sheathing.
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The main concern with spray foam insulation and shingle warranty is proper attic ventilation.
Bailes iii phd july 3 2013.
Nail it around the edges with roofing nails.
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.
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.
Spray foam insulation effect on a shingle roof.
It hits the osb roof sheathing and keeps going through the foam into the attic air.