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Old 02-11-2004, 08:34 PM   #29
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A single sheet would be the ideal, all areas would recieve the same stress. It's just what would happen when the stress that is spread across 5 or 6 joints is concentrated in 2 or 3?

John
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Old 02-11-2004, 09:12 PM   #30
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Joints

John,
I understand what you're saying. I think the answer is to bolt it down everwhere it crosses a crossmember, not just at the end-to-end joints. I got some good information on joints from the APA (American Panel Assoc) web site, on concrete form building.
Thanks for your suggestion.
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Old 02-12-2004, 07:16 AM   #31
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At lest on my '67 floor, there is a 4" wide piece the is used to back the joint in the ply wood that appers to be glued and screwed in place. It is the full length of the joint. This will strengthen the joint .
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Old 02-12-2004, 07:24 AM   #32
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Plywood joints

Tedd,
All the joints in my trailer were directly over crossmembers, and there are no joints at all in the fore and aft direction, so I'm really interested in how the joint in your unit was made. Was this joint you're talking about a side-to-side or a fore-aft joint?
Thanks for your help!
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Old 02-12-2004, 11:20 AM   #33
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My 1969 also originally had/has the 4" wide 1/4" plywood, glued and screwed beneath the subfloor panel edges.

I was surprised to find this, and I'm continually impressed by overall AIRSTREAM quality. It certainly does help to have the extra width for the subfloor panels edges to bind to, since the main frame channels only have ~1-3/4" wide flanges.

While I had the bellypan off, epoxying/replacing portions of subfloor, I added some "Simpson Strong Tie" strap ties between the panels to make the subfloor act even more as a continuous diaphram, as it is ideally intended. This distributes the stresses more evenly.

Christopher
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Old 02-12-2004, 12:34 PM   #34
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Mark,

The joint is side to side. You can see the seams on the floor as you walk from one end to the other of the trailler. I will get a photo of it tonight and post it or e-mail it to you. I'm thinking that since there is 8 years differance in our trialers, there are going to be some big differences. I'm upgrading my frame to a 1975 style with the steel cross member. There was an attempt made at some point to bolt in a cross member, but it failed.
I hate to take out all my floor since I can see where things went and where the tile and carpet were. I have photographed just about every square inch of the floor and walls to use as a refferance.
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Old 02-12-2004, 12:56 PM   #35
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Confused

When you say you are going to put in steel crossmembers like the '75, are you referring to just the one at the very rear? I thought all frames had crossmembers.

My crossmembers are 24" OC, so it matches the plywood joints very well.

Enjoyed your earlier post about the angle iron clips on the rear to anchor the frame to the body. I think I will do the same, but maybe go frame-to-frame across the back, or as far as it will go before the curvature becomes a problem.
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Old 02-12-2004, 06:55 PM   #36
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Mark,

You are correct, just the one across the back. The rest start at 48" from the back of the shell and are on 24" centers from there forward. From what I can tell and have been told, the rearmost cross member didn't start till around '75.
You have the right idea about the angle. I will trim my angle to match the body curve. Got to love those curves.

Sorry, I ran out of day light to get the picture. I will try tomorrow, if not Saturday for sure.
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Old 02-12-2004, 07:02 PM   #37
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let me see if this works....it ain't pretty.
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Yes, four kids and two adults in the thing.
Happy wife, happy life.
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Old 02-12-2004, 07:38 PM   #38
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Frame crossmembers

My '59 has a crossmember 22.5" forward of the rearmost xmember, don't see it on your drawing.
I think maybe this has something to do with the tanks. My blackwater tank sits above the floor. Do you have a blackwater below the floor, in the space where mine has the crossmember?
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Old 02-12-2004, 07:57 PM   #39
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Yep! A black water tank goes in the space between the dashed line and the first cross member. There is a whole thread on this in the plumbing section of interior restoraton forum. I will give you a link here in a little bit. You can see what I'm up against in there. tcwilliams has been a huge help to me on that subject.
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1967/8 Overlander International Twin w/ bunk/s.
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Old 02-12-2004, 10:09 PM   #40
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Here is a link to another forum thread where I posted some progress graphics. It shows both a rendering of the frame section and underfloor tank in question, as well as a diagram. I didn't want to waste server space by posting them again.

Also, note the foreground, where a section of the 4" wide plywood is shown spanning a crossmember at the plywood panel joint.

http://www.airforums.com/forum...&threadid=8560

enjoy,

christopher
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Old 02-13-2004, 05:29 PM   #41
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Here is a shot of the backing plate for the floor deck. As you can see it is like a spacer for the floor I'm still puzzled that the insulation is sandwiched between the cross members and floor. Won't that kill the R value?
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1967/8 Overlander International Twin w/ bunk/s.
Yes, four kids and two adults in the thing.
Happy wife, happy life.
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Old 02-13-2004, 05:38 PM   #42
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Here is a shot of the failed attempt to renforce the rear to prevent the dreaded SAG
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