Floor construction

[leighlandon]

I’ve looked around he forum and I see that when rebuilding the floor, it’s a layer of .75 PW, .50 foam, and .50 PW or .25pw...

I see some build out a frame around smaller squares of foam on top of the .75 and others put down full sheets of foam and screw thru the top layer...

Getting closer to tackling this project... and wanted some opinions on the 2 approaches.

Thanks,

Landon

[leighlandon]

Well posted this in exterior... how do we move this to interior...

[Razorback]

Moved to Interior......

[Salty]

I’ve looked around he forum and I see that when rebuilding the floor, it’s a layer of .75 PW, .50 foam, and .50 PW or .25pw...

I see some build out a frame around smaller squares of foam on top of the .75 and others put down full sheets of foam and screw thru the top layer...

Getting closer to tackling this project... and wanted some opinions on the 2 approaches.

Thanks,

Landon

3/4" PW, 1.5" foam, 1/4" PW. Edges are 1.5" poplar (2"x2"). Sleepers are originally 2x2 poplar (1.5")

[leighlandon]

Thanks Salty, so the floor is really 2.5inches... that’s incredible. Any thoughts on framing out the foam layer on the PW vs bonding the full sheets to the PW?

[Salty]

This may answer your question

[leighlandon]

Thanks for the picture, I see some who frame it like you did and I see others who will bond entire sheets instead of cutting into smaller squares... trying to understand the benefit to the extra work to frame the foam vs putting down the entire sheet of foam.

[KYAvion]

I may be wrong, but I believe that even though the foam has a good deal of compressive strength, 1/4” plywood is a pretty thin layer to have on top. Thus, the 2 x 2’s would provide additional support.

[Salty]

I may be wrong, but I believe that even though the foam has a good deal of compressive strength, 1/4” plywood is a pretty thin layer to have on top. Thus, the 2 x 2’s would provide additional support.

the 1/4" is next to the frame, but the rest of your statement is spot on!

In the photo above, you'll notice that the center sleeper is Oak. This was done for additional strength and support. I believe the factory used a single sheet across, but then the floor as a was assembled in its' entirety prior to the shell being affixed.

[SubAvion]

A basic question: can we put a layer of waterproof material (like vinyl) underneath the bottom layer of plywood, I.e., between the steel frame and the bottom layer plywood, to prevent moisture that rot the floor? Thanks