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It is difficult to suggest an exact temperature for shingle installation. There are several factors involved such as your geographical location, the amount of sun exposure at your particular home, etc. As always, we would suggest referring to your shingle manufacturer's guidelines.
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.
The BEST way would be infrared image testing. Only top-tier roofing companies will have them, so may be hard to locate in rural areas. However, the technology is getting older, and the cameras that were $1k, 2 years ago, are around $399.99. Its a solid investment, and requires none of the old, trial and error methods.
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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