Log homes must be maintained properly to control moisture. I recently inspected a home in Virginia that had numerous problems due to moisture intrusion into the logs. The logs will tend to split over time and water from rain will run into these cracks. This is conducive to wood rot and insect infestation. This house had both on a massive scale. Some wall sections will need to be completely rebuilt meaning big $$$$$$$. This could have been prevented with some simple maintenance
Trees absorb large amounts of water as they grow, this means that the tree cells are also able to absorb water very readily after the wood has dried. For this reason, a log home is very hydroscopic—it can absorb water quickly. This promotes wood rot and insect infestation. It is strongly recommended that you protect the logs from any contact with any water or moisture. One moisture control method is to use only waterproofed and insecticide-treated logs. Reapply these treatments every few years for the life of the house. Generous roof overhangs, properly sized gutters and downspouts, and drainage plains around the house are also critical for moisture control. Cracks surely will develop in the wood logs as the wood dries. These cracks must be filled with sealant to prevent damage.
If you own a log home, protect your investment, Log homes must be maintained properly to control moisture.
David DiRienzo, Richmond Virginia Home Inspector