Roof Tar Temperature

When to tar a roof.

Roof tar temperature. At low temperatures of 7 degrees c to 4 degrees c 20 39 degrees f asphalt temperature may drop 20 degrees c 50 degrees f in a matter of seconds. It can be applied to a roof in temperatures as low as 40 degrees fahrenheit but it will not properly seal until the temperature is at least 70 degrees fahrenheit. This article describes the different temperatures involved in asphalt roofing product manufacture and compares that to the on roof temperatures to which asphalt shingles are exposed when in service. You should also not apply tar when it is overly hot as the high temperature can cause it to drip.

Temperatures of asphalt shingles. The rooftop temperature results from two different properties. Avoid roofing in temperatures above 80 degrees f to eliminate these issues. If the asphalt is applied below the ideal.

While you can apply roofing tar at lower temperatures it will not properly set until it reaches 70 degrees. Ideal temperature to get the best results and to prevent breakage or softening of materials install roofing when the temperature is between 50 and 60 degrees f if at all possible. However this is more challenging in the winter. The ability of the material to reflect the sun s energy back into the atmosphere called solar reflectance and the amount of heat the material rejects instead of absorbs called thermal emittance both are measured on a scale from 0 to 1 with higher scores translating into cooler roofs.

At hotter temperatures. If the roofing job needs to be done immediately due to leaks or wind damage lay a tarp. Cold air can rob the asphalt of its heat between the roofing kettle and the roof s surface.