Not only does this violate building codes but your roof just won t last if installed atop a wet base layer.
Roofing in the rain wet wood.
Make sure your roof is completely dry before reroofing.
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.
As wood absorbs water it expands.
The above article mentions that the shingles won t adhere properly if the wood or water barrier is wet when the roofing is applied.
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.
Know what to look for.
Homeowners often worry that the wood is ruined if a house gets wet during construction.
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.