Wet bay floor

[JES3]

I can’t find anything about this topic so I’m putting this out to everyone.
I have a newly purchased (to me) 12 Aspire 42 RBQ. While under the coach today I found a soft spot in the wet bay floor near the center of the Coach. The black membrane on the underside is in perfect condition but, it seems some of the floor is very soft. The flooring has bracing on the underside so I’m not fearful of it falling out but this can’t be good. The outer sections are solid as a rock and I see no leaks from the tanks. I know Travel supremes suffered wet bay floors falling out. Has anyone come across this and know what the cause may be? Pretty sure I know what the cure is and it’s not pretty.

[fla tom]

I called Entegra about this issue just after my 2 year warranty was over on my 2015 Entegra. The tubing on the back side of the wet bay(in front of the drive tires ) are open at the top,the tubing filled up with water leaks through to wood in the wet bay past screws holding plywood to the tubing. Entegra needs to add drain holes/seal the top or add wheel well shields. They have not made any of these changes(as of the Tampa rv show).

[JES3]

Thanks for that info, I will have a look tomorrow and figure a cure so it doesn’t happen to the new floor when I get to it.

[fla tom]

When you replace it look at “king starboard “ it will never rot.

[voltdoc]

Originally Posted by fla tom

When you replace it look at “king starboard “ it will never rot.

Starboard is good stuff for some uses, but look into it carefully. Starboard is not intended for structural applications. It is also at least 3x the cost of marine ply and double the weight. Epoxy coated marine ply is much stronger, lighter and would last a very long time.

If it's just a small area and the structural aspect isn't at issue, a penetrating epoxy sealer might be an option. You would need to dry it out first tho. I've used this product to successfully repair rotted fiberglass boat deck coring.

[JES3]

Got a second look at the area today and I see what Fla Tom is talking about with the top tubing draining water down the wall. After further inspection it seems water may have also taken out the bottom 1” of the wet bay back wall as well.
This changes the entire scope of the repair. I was intending to only pull the water tank to replace the floor but the back wall replacement or repair looks like it would require the gray water tank to be removed as well. Was hoping not to touch the gray or black tanks. If I have to remove all tanks I would also investigate re-plumbing the 1/2 bath sink drain as Entegra plumbed it into the black tank for some reason. Has anyone completed either of these jobs? With photos?
I think Volt Docs idea of marine ply with epoxy is the way to go. I have worked with Ply/epoxy and Starboard as I have owned boats for 30 years and repaired many.