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Old 06-13-2017, 02:36 PM   #1
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Subfloor setups

So we have an elastomeric roof coat on our floor now and want to run out idea past some more people before committing. We are planning on taking 1/2" foam and gluing it to 4x8 1/4" plywood. We want to lay it down plywood side up with 1/4" gaps where the board butts the bus and 1/8" gaps between plywood. My only concern is that without having the plywood scrwed down to anything to may buckle irregularly. Any thoughts ?

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Old 06-13-2017, 03:00 PM   #2
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That's true, there can be some curl in the plywood if it's not held down by something. Most people have cabinets or other items that effectively hold down the floor and prevent warping.

That's generally called a floating floor and is pretty common in buses. I put screws in the corners and sides of the floor I did to make sure it wouldn't move or warp.
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Old 06-13-2017, 03:03 PM   #3
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Cool, I called the paint company that makes the elastomeric roof coating that we were planning on applying on the floor and they said absolutely not because of gasses that it releases. Does anyone know if there is a safe Interior paint that has the same properties as the elastomeric roof coating?

What did you screw into ? The metal floor? Is there a special kind of screw ?

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Old 06-13-2017, 03:16 PM   #4
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People have been using a number of methods to treat the rust on the steel floor. Ospho to kill the rust, then other treatments including Rustoleum. I've never heard anyone mention the solvents on these normal rust treatments. I can understand how an exterior sealant could have harmful solvents in it in comparison to other treatments, but I don't know much about that.

Yes, I just drilled pilot holes and put a wood to metal screw in each corner of the plywood sheets as cut to make the edges match. Don't make them to tight if you're including rigid insulation in your floor.
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Old 06-13-2017, 04:40 PM   #5
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1/4" plywood isn't going to give you much support to keep from denting the insulation underneath. I used 1" insulation and 3/4" tongue and groove Drymax OSB. I offset the seams of the insulation and the plywood to keep the seams from having a common weak area. All of mine is glued down.
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Old 06-13-2017, 04:54 PM   #6
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1/4" plywood isn't going to give you much support to keep from denting the insulation underneath. I used 1" insulation and 3/4" tongue and groove Drymax OSB. I offset the seams of the insulation and the plywood to keep the seams from having a common weak area. All of mine is glued down.
We are trying to keep the floor minimally thick as I'm 6'3. On top of the plywood we are putting 2mm underlayment and adding traffic master vinyl flooring. Do you think that will be adequate ?

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Old 06-13-2017, 05:45 PM   #7
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I don't know how flexible your other flooring materials are but I'd suggest thicker ply to make your floor solid. Tong and groove works well to keep the edges matching.
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Old 06-13-2017, 09:23 PM   #8
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I can only go by what I have done, but I would take away from the insulation thickness and add to the plywood. With your layers being thin I would try to avoid common seams. Maybe go with the 1/4" fan fold insulation and a 1/2" T&G plywood and use the same underlayment and vinyl. The adhesive I used is PL 300 which is specifically for foam insulation.
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Old 06-13-2017, 10:03 PM   #9
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What would be the downside to screwing to the floor? I planned on going under the bus to coat all the screws that came through.

I can relate to the OP. Im 6'2" and concerned about going to crazy on floor height. Im ok with slouching while walking, but my wife is not. If I go above the stock floor height by even an inch, she will be in danger of hitting her head...
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Old 06-14-2017, 05:53 AM   #10
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What would be the downside to screwing to the floor? I planned on going under the bus to coat all the screws that came through.

I can relate to the OP. Im 6'2" and concerned about going to crazy on floor height. Im ok with slouching while walking, but my wife is not. If I go above the stock floor height by even an inch, she will be in danger of hitting her head...
there is no downside, just a different way of doing it
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