Can I Use Felt Paper Under Metal Roof

When it comes to metal roofing there are two main options for underlayment.

Can i use felt paper under metal roof. Applications are similar for both materials and both stand up to the elements. Make sure the product is designed to be used under metal. 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. Synthetic or felt paper. Traditionally metal roofs have used standard 30 pound felt paper underlayment. 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. 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. 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.

30 felt doesn t come with any kind of warranty as opposed to synthetic underlayment which can come up to a 50 year warranty. When hot roof construction is done a roof with no ventilation a breathable underlayment is recommended. Architectural metal roofs with felt underlayment are best suited for buildings with proper slope and low moisture loads in dry or arid climates. 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.

Once again this is used on cold roof construction. Underlayment must also act as a secondary weather barrier in case the roof fails. 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. 30 felt is typically thicker stronger and may be less prone to tearing or ripping off during installation or weather events.

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