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Theoretically, there is no lower or upper temperature limit governing when asphalt fiberglass shingles may be applied as long as appropriate precautions are taken.
? In cold weather, for easiest handling, temperatures should be above 40° F.
? In hot weather, for easiest handling, temperatures should be below 90° F.
Those are the recommended temperatures, if you really need a need roof as long as you get 2 or more days above 30° F. you will be cover.
Each shingle manufacturer will specify if they have minimum temperatures for install. 40 degrees is a good rule of thumb. Below that, crews may have issues with their equipment (air compressors and hoses) working properly and shingles may not seal, espescially on northern facing slopes.
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