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Between 40 and 85 degrees is ideal!
In order for shingles to sit and form properly, it should be at least 36 degrees fahrenheit (2.2 celsius) outside when laying shingles.
I would recommend not less than 40 degrees. If the shingles are a dark color in direct sunlight they will seal in one day from the solar radiance from the sun even if temps are low.
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.
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.
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