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Old 03-05-2014, 06:35 PM   #1
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1960 33' Custom
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Euro floor sandwich

I've been reading up on different structural floor materials for an eternity and have started to come full circle and hence back to marine plywood. I've got the samples and it all looks good. So now I'm focused on insulation and specifically I'm intrigued with how exactly the Euro Airstreams and brands like Vantage here in North America utilize the 48mm sandwich floors, (I'm visualizing a couple of skinny layers of luan stuck either side of some polysomething or other board). I'm assuming they don't have the shell attached through the floor to the chassis but I really don't know.

There's a few reasons I'm really attracted to an insulated floor rather than insulating under the floor and as a starter I was wondering if anyone had started with the traditional 5/8" or 3/4" ply floor and added a layer of hard insulation board, say 3/4" thick then another layer of ply say 3/8", all with adhesives or mechanical fasteners. Even typing it makes it sound a bit sketchy but who knows I just thought I'd throw it out there.

Let's assume I'm not bothered by anything under the floor freezing and that I believe insulation products have moved on since the 70's, just in case

1960 Sovereign 33' Pacific Railroad Custom
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Old 03-05-2014, 06:50 PM   #2
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1980 31' Excella II
Sprung Leak , North Carolina
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I did some repairs on another AS, we put the blue dow board insulation on the underside of the plywood. IIRC it was 4" and was glued and screwed to the underside. I am not a fan of the AS system using the fiberglass batts. I would rather go without insulation than use that mess again.


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Old 03-05-2014, 06:56 PM   #3
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For sure fibreglass batts are not going anywhere near the chassis or floor! I used Styrofoam SM pink on my Overlander like you did with the Dow blue and it seems good but it's early days as it's not been installed for many years yet. I really like the idea of trying it above the floor, more like a click together floor that floats on a thin layer of foam but not so much floating :-)
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