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Old 10-22-2012, 01:13 PM   #15
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Indeed
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Old 10-22-2012, 01:17 PM   #16
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Are you familiar with SIP's? They are insulated panels, I won't get into it more than that....which are built like your describing here. You can have a SIP manufacturer make up the thickness you want...they will even put in runs for wiring and plumbing, tanks...whatever. Best of all they use specialized wood, glues and foams.
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Old 10-22-2012, 01:48 PM   #17
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Are you familiar with SIP's? They are insulated panels, I won't get into it more than that....which are built like your describing here. You can have a SIP manufacturer make up the thickness you want...they will even put in runs for wiring and plumbing, tanks...whatever. Best of all they use specialized wood, glues and foams.
Thanks for the input, we are looking into it right now, unfortunately the smallest thickness that we can find is 4 1/2 and we will need to stay at 2" to be able to slide it under the walls.
They look pretty similar to what the Refrigerated Trailers use on their construction, but we couldn't find that much info on it.
Will be interested on finding a place or to get a quote for 2" thickness and if we redo the whole area up to the bathroom that is 8wx30L...wow that is a lot of subfloor
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Old 11-16-2012, 05:27 AM   #18
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Hi guys,
Found a lumber supplier that has the has 3/8 CDX plywood and luan 1/8. Lowes has rigid insulation 1 1/2 thick, so it seems like we should be able to match the 2" sandwich floor.
We were reading a lot about sealing the plywood with either Spar Varnish or Epoxy resin and we have 2 questions regarding them:
1) what will be better in terms of flexibility since the floor flexes while traveling?
2) the insulation supposed to be glued to the plywood and according to our understanding with either products nothing will glue on, so wouldn't that affect the floor installation?
Thanks again guys
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Old 11-16-2012, 09:57 AM   #19
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Most of that rigid foam has a membrane that can be removed that would make it possible to glue to it. I would try some non-solvent based adhesives like Silicone and Polyurethane. Liquid nails will melt the foam. The latex based tile flooring adhesive might work well and you can trowel it on with a notched trowel. I would experiment first. If the floor is not adhered to the foam it will flex like mad.

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Old 11-16-2012, 11:44 AM   #20
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I believe Liquid Nails or PL has a Foam Insulation adhesive. I used it in a home renovation.
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Old 11-16-2012, 01:10 PM   #21
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Well we used this when doing the side walls of another RV and it worked great!
Loctite PL 300 VOC Foamboard Adhesive from Loctite Adhesives
The concern is that if we "seal" or waterprof the plywoods how will be possible to glue the rigid insulation to it?
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Old 11-16-2012, 01:11 PM   #22
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I believe Liquid Nails or PL has a Foam Insulation adhesive. I used it in a home renovation.
Hi Mixter,
Are you interested in making your subfloor a 3 layer one like this?
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Old 11-16-2012, 01:36 PM   #23
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Ha- not if i can help it! Although if the whole thing ends up coming off, then who knows !
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