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Old 04-25-2011, 03:38 PM   #1
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What is the metal sub-floor made of?

Looking up at the underside of my Classic, above the P30 Chassis, and on top Airstream Subframe, I see a metal sheet... looks like Aluminum.

I see them rolling it out on that great Motorhome Construction video on Youtube, and pop riviting it in place...
Good excuse to watch it again!
YouTube - Airstream Classic Motorhome Factory Production Vintage 1980's

Is it Aluminum, or something else?
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Old 04-25-2011, 05:27 PM   #2
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It is most definitely aluminium.
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Old 04-25-2011, 05:32 PM   #3
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Quote:
Originally Posted by Keyair
Looking up at the underside of my Classic, above the P30 Chassis, and on top Airstream Subframe, I see a metal sheet... looks like Aluminum.

I see them rolling it out on that great Motorhome Construction video on Youtube, and pop riviting it in place...
Good excuse to watch it again!
YouTube - Airstream Classic Motorhome Factory Production Vintage 1980's

Is it Aluminum, or something else?
I love that video!
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Old 04-25-2011, 07:31 PM   #4
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I think mine is steel, it is rusting badly. It may be galvi I don't know.
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Old 04-25-2011, 08:18 PM   #5
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Stick a magnet on it.
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Old 04-25-2011, 10:43 PM   #6
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I will be getting under there and testing with the Magnet, but I was puzzled as to what it was... I was swinging between galvi and Ali!
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Old 04-25-2011, 11:30 PM   #7
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Mine is aluminum covered with a rubber or vinyl membrane and then the plywood sub-floor.

Cheers, Dan
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Old 04-26-2011, 12:21 AM   #8
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Subfloor...

don't get it wet to find out!!!m
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Old 04-26-2011, 12:35 AM   #9
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Hi Key,

That metal layer is definitely steel on my 1990 325. I had to do MAJOR repair/replace work on my floors and spent lots of time cutting out big sections of that layer in the process. I removed everything from the rear bumper to the wheel wells, the entire raised cockpit floor, and four feet of the living room. It was heavily rusted and quite deteriorated in many areas. What a bear of a project it was. While that metal layer offers protection to the subfloor from the road below, it also prevents any interior water leaks from escaping through it, or gradually drying out. While some units seem to have plywood, my subfloor consisted of a layer of flake board, and we all know what happens when that stuff gets wet.
I hope that your floor doesn't look like mine! Good luck! Charly.
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Old 04-26-2011, 05:28 AM   #10
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Hi Key,

While some units seem to have plywood, my subfloor consisted of a layer of flake board, and we all know what happens when that stuff gets wet.
I hope that your floor doesn't look like mine! Good luck! Charly.
I have the same thing in mine must have been an effort to save money in the mid to late 80s.
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Old 04-26-2011, 01:23 PM   #11
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Mine is flakeboard too where I can see it, and I have some water ingress in the curbside bedroom closet next to the safe... First I thought it was the leak I found in the shower plumbing, so was puzzled by the fact it was wet and soggy again a few months later, after we had rain.
I think its the awning mounting, so i have some new sealant and will get up there and look soon.
My question was born out of my concern for that interlayer, and sounds like I need to be concerned...
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Old 04-26-2011, 10:39 PM   #12
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Hey Key,

The fun never ends in Airstream World!! PARTY ON!!!!
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Old 04-27-2011, 12:05 PM   #13
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Yup, and my party has barely started!
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Old 05-08-2011, 06:38 PM   #14
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OK, OK.....
Drum Roll................

The Metal Sub floor on my 1984 is NOT Steel or Galvanised Steel.
I checked today, and a strong magnet will not stick, even slightly.
I poked and prodded and I am fairly convinced its Aluminum!
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