So this is how I rebuilt the floor with 2x4s and 3/4″ plywood:
Here’s a good shot where you can see how the flat 2×4 acts as a surface for the subfloor to screw into. You can see the 2×4 floor joists (I would have loved to stand them up for added support but couldn’t change the height of the floor without causing a lot of other work). You can also see the type of foam insulation used and how I filled the gaps with spray foam.
I added plastic over the original aluminum and under the wood.
Add 1 1/2″ insulation and spray foam.
Tricky subfloor install around all the plumbing (I really did not want to re-do that as well).
Some brackets added for strength through the wheel well area.
I chose to run floor joists perpendicular to the frame as opposed to parallel with the frame. I’m not sure why but most trailers run the floor joists parallel to the frame. I decided my design would offer more support for the walls which were seriously sagging below the frame height. I am satisfied with the finished result of the floor. Very sturdy (not perfect) and easy enough to build.
The panoramas look a little wonky but give a wider perspective.
I drilled in half way before using decking screws (water resistant, stronger than brass grabbers) then screwed the floor joists in to the bottom plates.
Plastic foam and 3/4″ plywood complete the job.
The bottom plate in the wall above the wheels was a bit dry rotted but not completely compromised so I glued and screwed a 2×2 on the interior to provide added support for the wall and new wheel well.
Finishing the new subfloor. A milestone in the trailer project.
We wasted no time getting to work on the repairs. The old structure had a 2×2 on the bottom, then the 3/4″ particle board subfloor, and a 1×2 bottom plate sandwiched together under the studs. I decided to use a flat 2×4 on the bottom with a 2×2 bottom plate screwed up into the studs. The subfloor would no longer be part of the “sandwich” but would be screwed down into the exposed part of the 2×4. This would allow me to work around the plumbing with the new subfloor inside the trailer. You can see the dust on the ground that used to be the floor and bottom of the walls (completely rotted along the whole trailer). You can see I screwed a 2×4 into the studs and used a high-lift jack to support this section of the wall. I repaired each of the 4 wall sections separately.
Here I had to cut out the repaired section of the subfloor. It was 3/4″ plywood and was much stronger than the rest of the floor.
These pics really sum it up. The floor has disintegrated and caused a gap in bottom of the wall.
All better now:
Getting ahead of ourselves, we went to a few stores to look for items for our new travel trailer. We found a generator (which we eventually bought a year later) and a new toilet (which we eventually bought at a different store).
We found rot, evident when we removed the cushions of the couch (the floor far from solid). We found the front and rear walls were also completely rotted (you could poke your finger through the walls). At this point we were pretty disheartened about our poor purchase. We didn’t want to have to do so much work on this project. Since we’ve been through a home remodel and 100’s of other smaller home and automotive projects we decided to push forward with the project no matter what. We made the choice to commit to finishing the project.
After pulling up the carpet we can see obvious repairs to the floor (new plywood). Most of the sub-floor in the trailer is particle board. I can’t think of a worse choice for longevity and stability.
When taking this picture I realized I would need to remove the entire kitchen to properly replace the floor structure. I was still in denial.
The dust that used to be the floor is what convinced me we would need to rebuild the entire bottom structure of the trailer. To do so we would need to remove everything touching the floor in the trailer.
The rear wall and both sides in the rear of the trailer were completely rotted. Future posts will show the wall rebuild.
Most of the “floor” was broken up by hand, vacuumed, or swept out of the trailer. I can’t believe this thing made it home in one piece.
Moldy old holly broken retractable shade removal.
Some more “before” pictures of appliances and parts of the trailer. I wanted to get some more information and understand how this thing was put together.