By Steve Ratcliff, President of Tarco, Little Rock, Arkansas. The special
requirements of underlayment applications for primary roofs made of
tile and metal are clearly explained in this article in
Florida Forum magazine.
A closely watched application for premium underlayments is in metal and tile roofing. This application is an ideal match because it combines the watersealing performance of premium underlayments with the physical ruggedness of a metal or tile rooftop. Underlayments protect the building from water damage when the primary roof leaks while the primary roof protects the underlayment from physical harm and UV rays.
Modified bitumen has been used in underlayments for metal and tile roofs in the past but there were several drawbacks associated with them. The first has to do with the high temperatures that are reached beneath a metal or tile roof. In direct sunlight these roofs become quite hot, and this heat is conducted to the underlayment. Aluminum or copper roofs, and dark-colored painted steel roofs, can be hot enough to cause SBS-modified bitumen to melt and drip down the side of the building. In metal roofing applications, it is critical that the underlayment used have the ability to withstand high temperatures. Also, the SBS-asphalt blend must remain stable at these temperatures.
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