Roofing Rain On Felt

The material may dry out or leach oils in the heat.

Roofing rain on felt.

Waterproof roofing felt gives the roof temporary protection from rain while you apply shingles tiles or other roof coverings. 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. Roofing felt helps ensure the water drains off the roof and doesn t leak into your home. There are several disadvantages to using felt underlayment on a roof.

In high humidity materials may bulge or wrinkle causing ripples and bumps on the exterior surface of your roof. If it starts to rain or drizzle the roofers should act quickly to cover your osb most likely with a tarp. 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. 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.

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. The decking sheathing should have been tarped and work stopped as soon as it was evident enough rain was going to fall to wet the wood or water barrier felt. It provides backup protection in the event of ice or water damage. Roofing felt is not designed as a permanent exterior barrier against water.

It is safe to walk on. One disadvantage of traditional felt roofing underlayment is it generally can t be left exposed for more than a few hours. 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.

This would impact the felt s ability to protect against moisture.