Roofing Rain On Felt

There are several disadvantages to using felt underlayment on a roof.

Roofing rain on felt.

It provides backup protection in the event of ice or water damage. Having wet sheathing covered with tarpaper or membrane will trap the water in the sheathing very bad practice and contrary to industry standardss for roofing. One of the roofing pros we spoke with says mist won t affect osb any more than the humidity that osb absorbs on a hot day. In high humidity materials may bulge or wrinkle causing ripples and bumps on the exterior surface of your roof.

One disadvantage of traditional felt roofing underlayment is it generally can t be left exposed for more than a few hours. The material may dry out or leach oils in the heat. Roofing felt is not designed as a permanent exterior barrier against water. It is safe to walk on.

This would impact the felt s ability to protect against moisture. Felt that is rained on no matter how well its fastened imo will have bubbles it helps to let it dry out prior to roofing but bubbles will exist. Many of the inner components of your roof such as barriers osb boards and felt are also sensitive to water damage and should not be exposed to moisture. Roofing felt that has gotten wet can be covered with shingles as long as it is allowed to dry out first the surface underneath did not get wet and it did not wrinkle bubble or rip.

Wind driven rain or snow can trap water under your shingles putting your roof deck and inner residence at risk of moisture damage leaks rot and mold. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. Roofing felt helps ensure the water drains off the roof and doesn t leak into your home. Shingles or many other roof systems should not be installed over wet felt in the past i would cut x s thru the bubbles but now imo that should not be done.

Item 656632 model 0903000.