Temperature Under Metal Roof

It is available to use as flashing tape to provide a secondary water barrier.

Temperature under metal roof.

For more exposure temperature histories for shingles the reader is referred to publications by the national bureau of standards nbs 1979 and blackenstowe 1987. Our fabral high temperature underlayment is a durable self adhering modified composite underlayment specifically designed to withstand the rigors of most roofing applications. Clearly black roofs get the hottest. The temperature under a metal roof can get very high.

This is especially pronounced in aging roofs. Also the sbs asphalt blend must remain stable at these temperatures. 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. Metal roofs also get hot.

When 30 pound asphalt felt is exposed to excessive heat it will dry out quickly. The tough slip resistant poly fabric surface provides a rugged barrier to physical damage uv degradation weather and moisture. Because a metal roof can get hotter than a black asphalt shingle roof underlayments for metal roofing must resist flow at even higher temperatures. 1989 metal roof temperatures reached as high as 163 f 73 c during january and may in eastern tennessee.

In metal roofing applications it is critical that the underlayment used must have the ability to withstand high temperatures. The temperatures histories discussed hereafter pertain to wood.