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Old 04-25-2011, 02:38 PM   #1
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1984 34.5' Airstream 345
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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!


Is it Aluminum, or something else?
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Old 04-25-2011, 04:27 PM   #2
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It is most definitely aluminium.
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Old 04-25-2011, 04:32 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!


Is it Aluminum, or something else?
I love that video!
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Old 04-25-2011, 06:31 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, 07:18 PM   #5
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Stick a magnet on it.
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Old 04-25-2011, 09:43 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, 10:30 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 04-25-2011, 11:21 PM   #8
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Subfloor...

don't get it wet to find out!!!m
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Old 04-25-2011, 11:35 PM   #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, 04:28 AM   #10
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Quote:
Originally Posted by streamquest View Post
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, 12:23 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, 09:39 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, 11:05 AM   #13
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Yup, and my party has barely started!
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Old 05-08-2011, 05:38 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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Old 05-08-2011, 07:01 PM   #15
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Metal Subfloor

Keyair,
Just did a complete renovation on the underside of my 1993 LY MH and my metal subfloor was galvanized having a little bit of surface rust. I spray treated the entire underside with two coats of Rust Cutter and then repainted the complete bottom. (sounds a bit extreme) but wanted to try and stop any further rusting. Took a little while but finished last week. Here are a few pictures.

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Old 05-08-2011, 07:12 PM   #16
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Underside of motorhome

While working under the motorhome I noticed this and was wondering if anyone knows what it is - or what it does??
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a few more pics
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gloran - 1993 LY MH 33' - Banks System, Steer Safe, IPD front stabilizer, Super Steer - Bell Cranks, Motion Control, Coil

https://s1290.photobucket.com/user/gl...58808196506793
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Old 05-08-2011, 08:12 PM   #17
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That round disc with the cross pattern and a bunch of wires is the level sensor for your HWH leveling jacks. It's mounted on three bolts so you can fine tune it. I don't know if your system is automatic or not but on my manual system it lights up four lites. You raise the corners that are lit up and when all the lights are out the coach is level.

If you have any of that paint left feel free to come play under my coach. My sub panel is aluminum so you only have to do the frame rails and suspension.

Cheers, Dan
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Old 05-09-2011, 06:22 PM   #18
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Dan, thanks for the info on my jacks. Actually the project took way more paint, time and work than I thought it would, and I used every bit of the paint up, sorry. But it was one of those projects that I would classify as, once is quite enough. Thanks again Randy
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gloran - 1993 LY MH 33' - Banks System, Steer Safe, IPD front stabilizer, Super Steer - Bell Cranks, Motion Control, Coil

https://s1290.photobucket.com/user/gl...58808196506793
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Old 05-09-2011, 06:51 PM   #19
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Very, Very Impressive glorian

The effort and talent of persons posting , and sharing on this Forum is Supreme. to say the Least.

where did you get your coil springs and IPD stabilizer glorian
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Old 05-10-2011, 11:21 AM   #20
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John, I had the IPD front stabilizer and Steer Safe installed at Gary's Safty Center in Bay City Mi. The Henderson front coil springs I bought through Camping World. I think the coil springs made a big difference in ride.
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