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Old 05-29-2018, 01:12 PM   #1
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Floor insulation without 2x framing?

Getting ready to insulate the floor of my bus. Looks like some people use just foam sandwiched between plywood and their metal bus floor without any 2x2 framing. In this case, when you screw down the plywood, do you use long screws and go all the way thru the insulation and into the floor?


Is there an advantage of using the framing method over just insulation?
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Old 05-29-2018, 01:29 PM   #2
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I have seen it done both ways and i am almost to step as well. Curious to know myself.
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Old 05-29-2018, 01:34 PM   #3
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Depends on how your top floor is secured. I plan on a a floating floor of snap together laminate on top of 1-1/2" foam insulation with Pex heating coils. Cabinets will be secured to the walls., nothing through the floor.
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Old 05-29-2018, 01:37 PM   #4
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Interesting. I like the idea of not having the additional cost or height of plywood. What concerns would there be doing it this way? in this case, does anything get glued? Insulation to metal or laminate to insulation?
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Old 05-29-2018, 01:43 PM   #5
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i plan on a tight fit with the insulation and slight gap on the laminate, don't plan on gluing anything, which would make it no longer floating.
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Old 05-29-2018, 02:04 PM   #6
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I have some leftover laminate and a foam sheet at home. May just try this to see if the laminate joints buckle. That would be my main concern
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Old 05-29-2018, 03:22 PM   #7
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I am getting ready to do my floor as well, and going to try to do without framing too.


A couple of questions to add, does putting foam or plywood against the sides lead to squeaks while moving or walking? or is there something you are suppose to do to prevent the materials from rubbing.



And the only area I was concerned about framing would be the handicap lift. I am wanting to leave it in, at least for now. Not sure if I should just work around it, since I assume moving it and then putting it back will be tough. But if I did move it, would you frame underneath it since there is potentially so much weight in one spot if the lift was fully loaded?
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Old 05-29-2018, 04:10 PM   #8
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The only thing I did was to carpet the front and rear 1/3 and lino the middle. I've survived 3 Montana winters so far without frozen tootsies.
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Old 05-29-2018, 06:34 PM   #9
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I've got the metal floor, an inch of XPS, 3/4 inch of plywood, and then snap together "luxury" vinyl planks. So far so good! Framing under the floor didn't seem useful.
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Old 05-29-2018, 06:37 PM   #10
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I thought the framing may have been to keep the play from bending. Really wonder if I could get away with 25psi xps underneath with no wood
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