Can I Use Felt Paper Under Metal Roof

Synthetic also alleviates some of the weight on the roof because it is so much lighter.

Can i use felt paper under metal roof.

It s created by saturating paper or fiberglass mat with asphalt. Architectural metal roofs with felt underlayment are best suited for buildings with proper slope and low moisture loads in dry or arid climates. No 15 felt and no. When it comes to metal roofing there are two main options for underlayment.

Applications are similar for both materials and both stand up to the elements. 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. This allows moisture that can become trapped in the roof deck to evaporate and escape. 30 felt doesn t come with any kind of warranty as opposed to synthetic underlayment which can come up to a 50 year warranty.

Synthetic or felt paper. Underlayment must also act as a secondary weather barrier in case the roof fails. Once again this is used on cold roof construction. Both are good choices to use for metal roofing but there are some distinct differences to keep in mind.

Conversely felt underlayment is appropriate in conjunction with ice dam protection at eaves and other critical transitions in cold climates. When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended. 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. Make sure the product is designed to be used under metal.

Felt roofing underlayment is typically available in two types. Felt paper or not under metal rofing most codes and good roofing practice would require felt. The temperature under a metal roof can get very hot and over time 30 felt which is composed of asphalt will dry out quickly leaving not much in the way of a secondary weather barrier. The main advantage of using felt roofing underlayment is cost.

30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events.