There are many variables that affect when shingles seal down, not just temperature. First is the color of the shingles; darker shingles will seal faster than a lighter color shingle. Second is position; shingles installed on the south and west-facing roofs will seal faster than the north and east sides. Third, the slope of the roof can also play a factor. A lower sloped roof will typically seal faster than a steeper sloped roof. In addition, a sunny day at 50 degrees will cause the shingles to seal faster than a cloudy day at 50 degrees. A calm day will cause the shingles to seal faster than a windy day.
With all these variables, it is very difficult to state what the temperature needs to be for them to seal down, but simply, the warmer the better. In related fashion, Malarkey’s wind warranties go into effect once the shingles seal down. We advise roofing contractors and building owners discuss whether the roofing contractor will stand behind the installation until the shingles do seal down.