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