Good light weight Subfloor for bath?

[Mrcrowley]

I have cut out a piece of the bath floor behind the toilet and under inside skin had got water in and rotted it out . Ok here is the thing I DO NOT want to replace whole floor so I need a good light weight sub floor any suggestions?

[CanoeStream]

I'd go with what was originally there. Does it seem like you're seeing 1/2"? Marine ply aims to minimize unrepaired veneer defects in middle layers. I had trouble getting that locally and used 19/32" underlayment ply on my Argosy -- that caused a mismatch with existing floor but wasn't too bad.

It's hard to visualize how minimal you can keep this repair. Pictures are gooder...

[Mrcrowley]

Originally Posted by CanoeStream

I'd go with what was originally there. Does it seem like you're seeing 1/2"? Marine ply aims to minimize unrepaired veneer defects in middle layers. I had trouble getting that locally and used 19/32" underlayment ply on my Argosy -- that caused a mismatch with existing floor but wasn't too bad.

It's hard to visualize how minimal you can keep this repair. Pictures are gooder...

Well I have the pictures on my cell phone.But I want to go over the floor not replace the floor it is only like a 1.5 foot by 2.5 foot piece I have removed and it is half over a beam and no support under the inside skin. So If i can over what floor I have now which is in good shape I would prefer that (how about aluminum ,or thin metal of some kind?)

Actually I am going over today Ill get some more pictures...

[Mrcrowley]

Also there is no weight to bare wherer the hole is ..

[Ganaraska]

Here is a good way. Get some plywood the same thickness as the old stuff. Cut out a nice neat patch. Lay the patch on the floor and cut the old floor to match. Use a router to rout a step in the floor and in the patch so they overlap. Put the patch in with wood glue and screws for a permanent repair.

This is too obvious but you have to measure back from the traced outline, before you cut, to leave enough material to overlap.

[Mrcrowley]

Originally Posted by Ganaraska

Here is a good way. Get some plywood the same thickness as the old stuff. Cut out a nice neat patch. Lay the patch on the floor and cut the old floor to match. Use a router to rout a step in the floor and in the patch so they overlap. Put the patch in with wood glue and screws for a permanent repair.

This is too obvious but you have to measure back from the traced outline, before you cut, to leave enough material to overlap.

What about fabricating a fiberglass wood patch have the fiberglass over lap the wood subfloor have a tight fit with fiber glass over hang for support? anyone?

[Mrcrowley]

Originally Posted by Mrcrowley

I have cut out a piece of the bath floor behind the toilet and under inside skin had got water in and rotted it out . Ok here is the thing I DO NOT want to replace whole floor so I need a good light weight sub floor any suggestions?

The direct front part of the the floor where the two battery boxes and the Univolt is. It is getting week but I dont want to pull up the floor. What about fabricating a fiber glass subfloor over existing floor have aount 1/2 inch fiberglass subfloor and I could togle bolt floor down and deck screem it to . Would this be more problomatic or even work?

[Mrcrowley]

Actually the hole runs close to the rib beams I could put a piece of treated 2x4 across the length bolt it to the frame make a plywood patch matching floor and patch then screw patch to 2x4 then bondo or fill in seams and sand it . As far as the front goes could make a plywood patch with treated plywood and cut past first cross beam about a foot make a under liner for support and bridge patch to existing plywood then bolt it to the cross beam with new bolts and holes then bondo any spaces. I mean honestly I have another 15 years at least I can get out of this trailer after that I could do a full renovation.