Floor construction

[KYAvion]

Moisture in the floor ordinarily happens from leaks that occur from the top down, so I’m not sure a layer underneath would do much good. Now wrapping the edge of the plywood might have some benefit, but it would be somewhat negated by the fasteners attaching the shell to the frame that go through the floor. One concern would also be any water that gets through the holes for those fasteners might take longer to dry out due to being wrapped in vinyl. One thought might be to cover the top 6” or so of the floor with a waterproofing material, and just wrap the material under the floor just enough to cover the frame.

[SubAvion]

Thanks Paul!

I see some tiny nails to fix the shell to the floor plywood; outside the nail heads are sealed/covered by the black rubber band. I think these nails are of little use; the shell should Mainly be supported by aluminum studs.

[leighlandon]

Coosa... I am strongly considering 1 and done by using the Coosa board... has anyone used this on an Avion? In an Airstream the application works pretty well. Avion Layering is an additional issue since the product doesn’t hold screws well...

We all know it’s expensive, I’m just trying to work thru how best to secure it down.

It does come in 2inch thickness...

I am tinkering with the idea of not layering and using 2inch across the floor. Elevator bolts on the shell and self taping screws thru the frame... and that’s it.

Thoughts?

[Salty]

shooting from the hip:
On first glance, the product looks good. Easily shaped, no tools different from shaping plywood. Adhesives would be different. These would be my concerns.
I haven't seen the 2" thickness listed. I've seen 1/4" - 1 1/2", but I don't know the full product line. I haven't seen an R value listed, and while the propaganda sheet says it has excellent sound dampening and insulating qualities, I'd like to see that quantified - If a complete stack replacement is to be considered.
As for using it for top and or bottom layer replacement a couple things come to mind. For repairing a section - IE front corner, what is the thickness and how does it stack in relation to the balance of the floor components.
If you're replacing an entire floor, front to back, this wouldn't be a concern, but the trailer was designed with a flooring dimension of 2.1" - 2.2" total floor thickness. Dunno if that would create a problem.
Lastly, yeah, it's expensive, but one and done.

[leighlandon]

Did your 2.5 floor cause any notable issues?

[Salty]

I'm going to be Captain obvious. A 2 1/2 inch floor isn't going to be 2 1/2 inches. Lumber sizing.
Problems: getting the correct angle on the outer edge was a bit troubling, but doable.

I had to strip 4 inches of original vinyl so the floor height would match. Stripping that original vinyl was a pain

[Jason]

Has anyone tried this https://www.huberwood.com/advantech/subflooring its relatively cheap and I can get it locally. Watching the demo https://youtu.be/xZ9wy-8_rPc looks promising and the reviews online seem good.

[KYAvion]

Advantech is great stuff, but it’s heavy. It’d be worth looking to see how much heavier it is though. Maybe it’d be negligible.

[leighlandon]

Happy November! Quick question...

What are the length of elevator bolts that are used to connect the frame and floor to the shell?

Im thinking 2.5 or 3inch? Planning my attack...

[Salty]

You want 3 inch. 2 1/2 won't give you any room for a washer & nut.