Shingles will not stick to a wet roof.
Rain on wood roof.
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.
If the sheathing or wood is wet during the time of installation it can trap moisture inside of your roof leading to mold rot or other severe problems.
Rain can also make it harder to sealants and other materials to dry or be secured in place properly.
Wood rot can and will start when the moisture content of the wood reaches 20 percent.
What to do when it rains during a roofing job.
Note that you should never shingle over bare wood like a bird s feathers shingles shed the qwater but are not watertight especially in windblown rain or melting snow conditions.
Wet or rain soaked framing lumber will not rot in a matter of days.
It might even be unsafe for roofers to work on your roof during rain so these aren t risks you should take.
Water can cause problems if the lumber is allowed to stay wet for weeks and weeks so do whatever is possible to get a roof on the house.
Roofing in the rain not only means you or your roofing experts will be extremely wet uncomfortable and exposed to more risk but it also means that your new roof could have less integrity than if it were installed in dry conditions.
It is not the fault of your contractor and while the delays can certainly be frustrating a contractor who attempts to install a new roof in the rain is going to be compromising the overall integrity of the installation.
Aside from the damage it could do to your home or unfinished roof rain is harder to work in.
But wood rot is a slow process where the fungi start to grow and feed on the cellulose in the wood.
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Be wary of a roofing contractor who promises to install a new roof regardless of the weather.
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.