Roofing Rain On Felt

Roofing felt helps ensure the water drains off the roof and doesn t leak into your home.

Roofing rain on felt.

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. 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. If it starts to rain or drizzle the roofers should act quickly to cover your osb most likely with a tarp. 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. In high humidity materials may bulge or wrinkle causing ripples and bumps on the exterior surface of your roof. 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. Waterproof roofing felt gives the roof temporary protection from rain while you apply shingles tiles or other roof coverings.

Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. 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. It provides backup protection in the event of ice or water damage. 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. Roofing felt is not designed as a permanent exterior barrier against water. 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. The material may dry out or leach oils in the heat.

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