99 HR Endeavor interior wall rebuild

[Endeavor99]

Due to water damage I’m having to reconstruct the interior wall behind the passenger seat on the curbside of my coach. Unfortunately the wood luan has disintegrated that is glued to the outside skin behind the wall joists. I suspect there is no way to replace w/out removing the outside skin so I’m looking for alternatives. I noticed the bedroom wall had been replaced and it appears some sort of spray insulation was used in place of the fiberglass batts when I inspected thru a electrical outlet. Not sure if that offers some additional structural integrity in place of the luan. Appreciate any other recommendations. Thanks.

[153stars]

Marine wood hardener / rot repair epoxy. You would want to kill any mold and mildew. Absolutely dry wood with fans and dehumidifier .

[jacwjames]

A closed cell foam would provide some support and provide better insulating characteristics. You can buy kits to do small areas at a reasonable cost. https://www.lowes.com/pd/Dow-FROTH-P...Kit/1000015591



I built a new house and got quotes for insulating. All the contractors offered the full foam package but I couldn't afford the cost but a viable option was to do a "Flash & Batt" method where by they sprayed a ~3/4 layer of foam on all exterior walls and then used batt to complete the job. The foam sealed all the crack to prevent air infiltration, added about ~R2-3, and also stiffened everything up.

[Endeavor99]

I definitely will plan to treat the rotted wood and look into the insulation you suggest prior to reinstalling the walls (I will need to make). Thanks for the tips.

[Dav L]

You can consider removing the interior, removing insulation and sliding out the bad Luan and sliding in new Luan after all is demolded and dry. As big a sheets that are manageable. Probably a little narrower than a stud cavity. Unless you can use Height, double up and then shift into position (if that makes any sense). You can always glue a second layer of luan where the seams are (mid stud) so mid stud there aren't any weak spots. Worse case is messing with the exterior on difficulty to fix cosmetically without paint et al that is lots more work.

You can also glue Pink insulation inbetween studs to the exterior luan that will provide further strength and help straighten the exterior fiberglass. Spray foam can make this worse as it expands in unexpected ways. If it pushes on the exterior (like if it gets between stud and Luan) then it can create a wave. I do use spray foam on side cavities the rigid foam inevitably has from misfit.