Is Felt Paper Required Under Metal Roofing

What types of underlayment are available for metal roofing and which is the best choice for your design or installation.

Is felt paper required under metal roofing.

The roof deck should be sound and level before laying the underlayment. Felt paper or not under metal rofing. Most codes and good roofing practice would require felt. Underlayment must also act as a secondary weather barrier in case the roof fails.

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

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. 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.