Wolf Creek 850 front box issues

1mtnman wrote:
I recently repaired a Hallmark that had a very thin sheet of plywood as that of your Wolf Creek. It had rotted over the years and was a poor design coming from the factory. I use 1/2 marine ply and 3 coats of Flex Seal. I applied the Flex Seal prior to installing the plywood and then just had to touch up where the screws into the frame were installed. If you haven't use Flex Seal it is a outstanding product. I then use aluminum angle to cover the outside edges.

.....I did exactly the same repair/reinforcement under our 2005 Outfitter (8 foot long tub). Most of the 1/8 inch lauan thin veneer ply rotted right off, exposing the aluminum frame and XPS foam block insulation between the aluminum joists. I had to strip off what was left of the rotted 1/8th inch lauan, yank out the several hundred staples from the aluminum (that was brutal to do, on my back, under the camper tub, with a pair of pliers LOL). Then, I coated 1/2 inch marine plywood with 3 coats of marine hull varnish (the 2 flat sides, and the 4 perimeter edges), then applied sealant to the exposed aluminum floor joists, and using hydraulic jacks, and bracing, raised the 1/2 inch plywood up to the under-floor, and compressed the new treated ply onto the underside, and screwed the new ply in place through the aluminum floor joists..I also caulked the joints where the several sheets butted together, and applied aluminum L extrusion to the whole perimeter of the tub....feeew. I don't want to have to do that again!

*On edit: ...our under-tub floor does not have access to any "equipment", nor does our under-floor cap any hollow pockets, so, as mentioned above, you may want to consider 3/4 inch plywood, and not 1/2 inch