How to Fix Rotted Walls in a Motor Home

Remove the rotted wall areas. If the rotted wall is behind fixtures such as cupboards, completely remove those first and inspect them for damage. If the wall is badly rotted, you will be able to pull it out by hand in pieces. If only a small area is rotted, you can use a saw to cut out the damaged part. If the wall panelling is not rotten, you will need a screwdriver or small crow bar to begin prying it free.

Inspect the insulation behind the wall to see whether water has damaged it, in which case it might already have developed mold. Damaged insulation will have to be taken out and replaced. Inspect the wall studs to ensure they aren't rotten. If they are, replace them. Everything must be thoroughly dried before further work is done. This can be done by running a heater in the motor home for a couple of days.

Replace studs if necessary and coat with clear penetrating epoxy sealer. Replace insulation. Carefully measure the size of the wall panel area for replacement and cut the new paneling to size with a saw. Get help to hold it in place and carefully line the edges up. Use a combination of adhesive and wood screws into the studs to hold it in place. Apply trims or seam strips, and clean up any mess.