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I had a similar problem with a motorhome I previously owned.
Side of the motorhome was damaged when a car sitting next to it caught fire and burned...melted part of the fiberglass siding and some plastic parts.
The people who repaired the RV did a poor job of sealing a bedroom window (along with other issues) which resulted with the same problem you have.
First, I removed the inner window frame, then I cut the inner panneling and removed the damaged portion until I was shure I had all the damaged material removed.
The structure of the RV was square steel tubing and I had to remove the rust and retreat and paint the steel. The insulation was styrofoam block and was not damaged by the water and was reusable.
I did have to add some wooden strips where the replacement panneling abutted the original to have something to fasten both to. I did that and installed some trim molding over the joints and the finished job looked really good. I did remove the entire window and reseal it.
There was luck involved in that the bedroom was twins and the panneling that the matress pads were on were the same panneling as the side wall. I simply used that for the side wall and replaced the bed top with the nearest match I could find.
That is what I did; however, each case is different...if you have wood structure, you may have to replace some of the wood as well as possibly the insulation.
Be careful around any plumbing and electrical stuff.
Good luck with your project,
John |