Is It Ok If Roof Felt Gets Wet

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.

Is it ok if roof felt gets wet.

Waterproof roofing felt gives the roof temporary protection from rain while you apply shingles tiles or other roof coverings. Roof replacement is expensive. During clear 70 degree days we have more flexibility in our schedule. 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.

The felt can be damaged if exposed to moisture too long. Any moisture trapped in the roof will flow down and out. This shortens the effective life of the shingles and can adversely affect the roof sheathing. But not for long periods of time.

I ve tried covering the roof to protect from rain with plastic or. That s why planning is so important during a roof installation. Doesn t matter at all. Osb like all other wood will expand when exposed to moisture and i assume the contractor spaced the panels the required 1 8 along the 4 edges and installed h clips along the 8.

Roofing felt should ideally be dry when shingles are installed to avoid ripping but it s still possible to install when wet. This moisture can lead to mold and mildew forming underneath the shingles. Roofing felt is not designed as a permanent exterior barrier against water. Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof.

When the felt gets wet it will crinkle up and not lay flat which may not be noticed if you have a thick comp shingle 30 year. The felt collects and then repels the water allowing the roof to breathe. The bubbled felt can cause a minor lump on the finished roof depending on what sort of roofing you re using. Certainly it would have been better to have covered the roof with a tarp or roofing felt before it rained.

However when the rainy season is here we make sure to work quickly efficiently and safely. 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.