What might cause moisture inside walls?
We're having the exterior of our house painted, and as the painters scraped the old paint, they found that the many of the clapboards and the wood behind them is entirely rotted. They opened some holes through the rotted wood and found the insulation soaking wet.
We do not have gutters, although after our experience today with the rotted walls, we're putting "install gutters" first on our to do list. However, the painter thinks that water INSIDE the walls (the sodden insulation in particular) would not be caused by a lack of gutters. He suspects there is another problem somewhere.
The house is perfectly dry from the inside. We have a one-year-old roof (with correct flashing, ice and water shield, etc.), and the walls were definitely wet with the old roof as well - so I don't think we can blame the roof.
Can anyone think of another possible reason for moisture inside the walls? Any idea what type of contractor we should call to investigate? Do you think it's just the lack of gutters, or do you agree with the painter than there is probably another issue?
Thanks for any advice.