Is Felt Paper Required Under Metal Roofing

There are several types of felt underlayment including both organic reinforced and inorganic reinforced.

Is felt paper required under metal roofing.

Felt paper or not under metal rofing. The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment. With metal roofing its also a good idea to put a layer of red rosin paper between the felt or ice water shield and the metal that way it wont potentialy stick to it and cause oil canning and would allow for expansion. The addition of a slip sheet will increase the cost.

The roof deck should be sound and level before laying the 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. Most codes and good roofing practice would require felt. Roofing underlayment or felt is usually required for the ul fire rating to apply since shingles are usually tested with underlayment.

What types of underlayment are available for metal roofing and which is the best choice for your design or installation. Underlayment must also act as a secondary weather barrier in case the roof fails.