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.

For the most part though felt paper and its synthetic counterpart both do a great job of weatherproofing the decking before shingles can be applied. 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. When it comes to metal roofing there are two main options for underlayment. Architectural metal roofs with felt underlayment are best suited for buildings with proper slope and low moisture loads in dry or arid climates.

It s created by saturating paper or fiberglass mat with asphalt. 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. Felt paper or not under metal rofing most codes and good roofing practice would require felt. Traditionally metal roofs have used standard 30 pound felt paper underlayment.

Underlayment must also act as a secondary weather barrier in case the roof fails. Felt roofing underlayment is typically available in two types. Applications are similar for both materials and both stand up to the elements. No 15 felt and no.

30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events. Synthetic or felt paper. The main advantage of using felt roofing underlayment is cost. When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended.

Both are good choices to use for metal roofing but there are some distinct differences to keep in mind. Felt roofing underlayment is one of the oldest types of roofing underlayment. 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.

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.