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Old 01-03-2012, 06:26 PM   #1
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1979 28' Ambassador
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Shell off floor pattern - rear corners different!

I started a shell off restoration a couple weeks ago on a 1979 28'. It was the first Airstream my grandfather ever sold when he started working as th GM at the now gone AS dealer in New Orleans.

Anyway, i have the shell off and before i pulled the floor and started my metal repair i used the old floor to pattern new pressure treated plywood. Since there was some plywood rotted away i used the best corner on the front to to help fill in a gap in the radius on the other side. Both front corners proved to be identical. When i got to the back i started with the best corner and cut it. When i took the drop and placed it on the other side to fill in the missing radius i dicovered it was drastically different. The street side rear corner had a smaller radius or was pulled in a good 1.5 inches. All the steel, aluminum, and plywood are all original so it appears to have left the factory this way.

I would guess all plywood is cut from a jig at the plant. It seems very strange that the two rear corners were cut so different. I was curious if anyone had ever run across this. I would imagine many may pattern and never compare but was wondering if anyone else had seen the same thing.

Replacing rusted out steel now and to the sandblaster hext week!


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Old 01-03-2012, 06:45 PM   #2
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Please do a search on the use of pressure treated plywood and it's interaction with aluminum.

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Old 01-03-2012, 06:49 PM   #3
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you would never use PT wood inside your house would you? PT plywood is very unstable, not flat, full of voids, and varies drastically in thickness over the sheet. The way it reacts with aluminum is just one of many reasons why not to use it.
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Old 01-03-2012, 06:53 PM   #4
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wow, that is odd. I can comment that my '91 is consistant from side to side. I'm pretty sure my '63 was, based on the small shards of flooring that was left.

I know the '63 is the same now, that's how I 'cut the corners'...
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Old 01-06-2012, 02:16 PM   #5
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I can tell you neither our (at the time) '64 GlobeTrotter or our '56 Safari were consistant side-to-side or front-to-back at the curves.

I concur...don't use pressure treated plywood in your trailer. We used marine grade, it's much more stable, flat, consistant and it doesn't off-gas or interact with the aluminum.

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Old 01-06-2012, 02:42 PM   #6
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Go with MGP you will love it! Frank (62overlander) recomended Aquatec and it really worked well for me.
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Old 01-06-2012, 05:55 PM   #7
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The floor on our '59 was in good enough shape to measure. No two corners were the same radius. And some of them weren't even circular.

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