I was just given an 8 foot cabover camper with straight aluminum siding, perfect windows and accessories, and significant wood rot in one side and the plywood floor. I think I'll remove all the siding, repair the damage to the frame, build a new base, install new insulation and new interior paneling.

Has anyone used PVC or Composite decking boards instead of wood for camper rot repair? I know it's expensive, but wouldn't it be useful for repairs in certain places, like window and door frames? Seems it would be a time-saver over waterproofing douglas fir boards.

Then there's expensive marine plywood. Is there a less expensive alternative? Like just painting exterior plywood or coating it with bed liner?

What about using fiberglass for building a new base using techniques similar to boat construction? What I mean is a thin plywood structure covered in fiberglass, instead of 1 inch plywood sheets screwed and glued together then covered with rubberized paint.

Thank you.

I think if I was going to do a rot restore, I'd use .40 retention pressure treated pine thats rated for water immersion. That stuff never rots and it's substantially cheaper that engineered (plastic) wood. Heck, it's Dug Fir injected with anti rot compound.

Just don't get any slivers in your hands. It festers right now and itches like heck.
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I'd do the lower in .40 retention marine grade 3/4" plywood as well. 4 ply with waterproof adhesive will outlast you,

Thank you sidecarflip. That's what I was looking for!

The 'plastic' wood is much heavier too. I did a deck with the stuff and I was amazed how much it weighed.