Installing a new TT subfloor

[Susie410]

After 12 years we need to replace the plywood floor in our toy hauler . We’re not sure if we should use marine grade plywood with light waterproof treatment or regular grade plywood with heavy waterproof treatment . Hubs is very capable of construction /installation ability, but any suggestions regarding tearing out and installation of new plywood would be greatly appreciated! Thanks in advance!

[BeatCJ]

My choice would be a marine grade material. The glues are better suited to a moist atmosphere. No matter what you do as a surface treatment, it will eventually allow moisture penetration.

I would be curious why you need to replace it? Is there another problem? I would want to make sure you eliminate the cause, too.

[hamm2018]

Originally Posted by Susie410

After 12 years we need to replace the plywood floor in our toy hauler . We’re not sure if we should use marine grade plywood with light waterproof treatment or regular grade plywood with heavy waterproof treatment . Hubs is very capable of construction /installation ability, but any suggestions regarding tearing out and installation of new plywood would be greatly appreciated! Thanks in advance!

I have had to replace small sections of the subfloor and have just used regular plywood. How large of an area our talking about?

[tuffr2]

If you are planning on keeping the trailer I would use marine grade plywood. If not, use regular plywood.

[Susie410]

Originally Posted by BeatCJ

My choice would be a marine grade material. The glues are better suited to a moist atmosphere. No matter what you do as a surface treatment, it will eventually allow moisture penetration.

I would be curious why you need to replace it? Is there another problem? I would want to make sure you eliminate the cause, too.

Mostly soft spots around the ramp door. We are guilty of sleeping with it open and the screen down,,and have had a few times when we got soaked. We’re also planning on replacing the weatherstripping around it. Checked for leaks and didn’t see any

[Susie410]

Originally Posted by hamm2018

I have had to replace small sections of the subfloor and have just used regular plywood. How large of an area our talking about?

The entire floor from the kitchen back. Kitchen and bathroom are good

[hamm2018]

It will be a task to replace the "entire floor", because the walls sit on the floors.
You will have wood under the walls, it could be difficult to get it all out and the replacement pieces installed.

[JMitchell]

Ok I ruined my edit by adding pictures.. but the TL/DR was:

I replaced a portion of my rear floor and interior wall on my Sonic 190VRB. Method was learned from YouTube university and involved a mold/rot killing with chlorine and then sistering rotted joists with new PT exterior ground contact lumber and new flooring also ground contact PT. And using 2-part epoxy off Amazon to strengthen/seal/waterproof the whole solution.

With the non-porous epoxy finish, laying down peel and stick was a great solution to the Linoleum removed. And the fix was rock solid.

Btw for rear wall repair, utilized FRP from Home Depot. Heavier, but totally waterproof required no finishing, and easy to work with.

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