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