Is Felt Paper Required Under Metal Roofing

Underlayment must also act as a secondary weather barrier in case the roof fails.

Is felt paper required under metal roofing.

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. Might require a slip sheet a slip sheet is a layer of building paper that is installed beneath the roofing material to further protect the felt underlayment from damage or sticking that can occur when coming into contact with metal panels. Roofing underlayment or felt is usually required for the ul fire rating to apply since shingles are usually tested with underlayment. Fifteen pound or heavier felt underlayment is required by code in some areas.

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. What types of underlayment are available for metal roofing and which is the best choice for your design or installation. Most codes and good roofing practice would require felt.

Felt paper or not under metal rofing. The addition of a slip sheet will increase the cost.