Underlayments For Metal Roofing

In addition to choosing roofing materials you should also consider roofing underlayment.

Underlayments for metal roofing.

The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment. However contractors now recognize the benefits of synthetic underlayment for metal roofing particularly when it comes to its tolerance to heat and ultraviolet uv radiation. When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended. There are two types of underlayment for a metal roof felt paper and synthetic each with its pros and cons.

Synthetic underlayment is a roofing accessory created by weaving spinning together polypropylene or polyethylene and a polymer to form an all over protective barrier to put between the roofing material and the roof deck. Synthetic underlayment is a newer innovation that is taking over the metal roofing industry as a better more advanced replacement for felt underlayment. Underlayment is the final weather barrier between your finished roofing and your roof s raw plywood. Synthetic underlayment for metal roofing if you still use 30 roofing felt you re throwing your money away.

It s a better and more advanced metal roof underlayment. Synthetic underlayment heat and uv resistance. The synthetic type is a relatively newer technology and is made by spinning together polyethylene or polypropylene with a polymer. Once again this is used on cold roof construction.

Traditionally metal roofs have used standard 30 pound felt paper underlayment. It s about 10 times lighter than felt so it goes up faster and puts less weight and stress on your roof. Underlayment must also act as a secondary weather barrier in case the roof fails. It serves as a moisture barrier as well as a slip sheet.

Shingles for example are just the first line of defense against elemental damages. The temperature under a metal roof can get very high. Our synthetic underlayment is 20 times stronger than felt it won t rip or tear and it won t buckle when wet.