Temperature Under Metal Roof

While most are designed to last 20 years or longer black roofs can suffer because heat speeds up the breakdown of materials in fact heat wear and tear is the main issue from a longevity standpoint.

Temperature under metal roof.

Because a metal roof can get hotter than a black asphalt shingle roof underlayments for metal roofing must resist flow at even higher temperatures. This is especially pronounced in aging roofs. The temperature under a metal roof can get very high. It is available to use as flashing tape to provide a secondary water barrier.

The temperatures histories discussed hereafter pertain to wood. Conversely a metal roof is very reflective which means that a majority of light rays are reflected away from your home keeping your home and attic at an even temperature year round. When 30 pound asphalt felt is exposed to excessive heat it will dry out quickly. For more exposure temperature histories for shingles the reader is referred to publications by the national bureau of standards nbs 1979 and blackenstowe 1987.

In metal roofing applications it is critical that the underlayment used must have the ability to withstand high temperatures. In addition it is susceptible to failure because uv radiation deteriorates the asphalt felt. 1989 metal roof temperatures reached as high as 163 f 73 c during january and may in eastern tennessee. Metal roofs also get hot.

Also the sbs asphalt blend must remain stable at these temperatures. Our fabral high temperature underlayment is a durable self adhering modified composite underlayment specifically designed to withstand the rigors of most roofing applications.