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.
Roofing shingles and foam insulation.
If you do not have proper ventilation you are in essence cooking your shingles.
At night it goes back through the foam to the osb.
It hits the osb roof sheathing and keeps going through the foam into the attic air.
Get to know more about one of the most popular commercial roofing systems.
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The nail holding ability of the insulation is not adequate.
Research from florida shows that shingles don t get much hotter with spray foam insulation under the roof sheathing.
An attic that is properly vented has 50 intake of fresh air and 50 exhaust of the hot air.
Most people do not realize the requirements for proper venting of an attic.
Nail it around the edges with roofing nails.
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The main concern with spray foam insulation and shingle warranty is proper attic ventilation.
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How owens corning is responding to the covid 19 pandemic.
Asphalt shingles may be damaged or punctured when nailed onto a non rigid surface such as roofing insulation.
Consequently shingle damage and or blow off may occur if shingles are applied directly to insulation.
Spray foam insulation effect on a shingle roof.