Can I Use Felt Paper Under Metal Roof

This allows moisture that can become trapped in the roof deck to evaporate and escape.

Can i use felt paper under metal roof.

Make sure the product is designed to be used under metal. Synthetic or felt paper. 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. Traditionally metal roofs have used standard 30 pound felt paper underlayment.

When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended. Once again this is used on cold roof construction. 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. When it comes to metal roofing there are two main options for 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. Underlayment must also act as a secondary weather barrier in case the roof fails. 30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events. Felt roofing underlayment is one of the oldest types of roofing underlayment.

Both are good choices to use for metal roofing but there are some distinct differences to keep in mind. Synthetic also alleviates some of the weight on the roof because it is so much lighter. 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. The main advantage of using felt roofing underlayment is cost.

Felt paper or not under metal rofing most codes and good roofing practice would require felt. No 15 felt and no. Felt roofing underlayment is typically available in two types. Conversely felt underlayment is appropriate in conjunction with ice dam protection at eaves and other critical transitions in cold climates.

It s created by saturating paper or fiberglass mat with asphalt.