I have a 3-panel patio door (center opening french door) where the caulking deteriorated in the two lower corners — and yes, I didn’t catch it until after damage occurred. What occurred was water seeped into the lower corners and rotted the 3/4 OSB subfloor material – the bottoms of the door 2×4 framing looks OK. The problem it that the OSB subfloor has turned into a dry spongy consistency that turns to dust when touched. This area is in both subfloor corners of the patio door and is several inches under door and under the 2×4 framing of the frame itself. To add insult to injury, a local ant colony made its new home in one corner as well. They dug or ate away about a 2 1/2″ diameter section of the OSB material. I can literally put my index finger through the OSB into the basement. My question is how do I fix (or replace?) the OSB subfloor that is part under the patio door and part under the patio door framing?
A carpenter friend of mine suggested taking out the patio door and cutting out a 1 foot wide strip of the OSB in front of the door the entire length and extending past the framing to include the all the damaged area, digging out the damaged OSB under the framing, and then sliding in new OSB/plywood to replace. Another friend, not a carpenter, said to get the epoxy material the sell for fixing rotted wood, he thinks is would be less work and easier to do… Advice from you experts is appreciated.
Edited 5/7/2006 9:45 pm ET by mark14