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Old 04-17-2013, 08:06 AM   #15
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1988 25' Excella
1987 32' Excella
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I do not think that there is a "magic" floor material for airstreams.
Exterior plywood will work fine. Treated plywood is very corrosive to both steel and aluminum. Marine plywood offers no advantages over exterior plywood for this application. One just has to stay up with the leaks and keep the floor dry. Even if you put in a floor that is unaffected by water the frame will still rust from the leaks. I think the floor provides horizontal racking strength for the trailer frame so I would not use strips or planking to replace the plywood.
Looking at your pictures I would just patch any weak spots in that floor and go forward. Most of it looks sound to me.
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Old 04-17-2013, 12:09 PM   #16
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Originally Posted by Jamespio View Post
Why are you replacing those floors? I don't see any significant damage, other htan some water stains. Are they rotting in ways or places not obvious in the photos? THey may not need replaced.
I will take and post more pictures when I can of the floor rot that is in several places. There is even holes. The floor is also very uneven. It sinks in some places and bulges in others. That is hard to show in a picture. We also maybe replacing it out of ignorance. I fully admit that. We also would like to check the frame to make sure it is in good, so thought we would need to pull up floor. We also would like to reinsulate. I really appreciate everyone thoughts, advice, and opinions. It is very helpful!.
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Old 04-17-2013, 12:12 PM   #17
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The biggest area for concern is the rear floor area which is the main structural attachment area for the shell. Small areas can be patched or treated with epoxy/fiberglass resin. Bleach and then some good deck and floor paint will solve smell and stain issues with the old floor.

Perry
Good Advice! Thank you!
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Old 04-17-2013, 12:17 PM   #18
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Originally Posted by Bill M. View Post
I do not think that there is a "magic" floor material for airstreams.
Exterior plywood will work fine. Treated plywood is very corrosive to both steel and aluminum. Marine plywood offers no advantages over exterior plywood for this application. One just has to stay up with the leaks and keep the floor dry. Even if you put in a floor that is unaffected by water the frame will still rust from the leaks. I think the floor provides horizontal racking strength for the trailer frame so I would not use strips or planking to replace the plywood.
Looking at your pictures I would just patch any weak spots in that floor and go forward. Most of it looks sound to me.
You give me excellent advice. We were in the process of looking into Nyloboard after reading an extensive thread here on the forums. I was beginning to wonder if we were chasing rainbows and there is no "perfect" subfloor. My husband owns/manages a building supply company and plywood would definitely be the cheapest route for us to go. Thank you so much for taking a look and your advice.
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Old 04-17-2013, 12:56 PM   #19
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Here are some more detailed pictures of the floor where it is damaged and where it slopes. Maybe these are better.
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Old 04-17-2013, 12:58 PM   #20
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We went with exterior BCX due to cost. Marine grade is EXPENSIVE! Even though most of our floor was "sound" and just the back and couple places in front rotted, we replaced it all. It was amazing how solid the new floor felt as compared to the old. I recommend replacing. It gives me peace of mind, too.

Kay
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Old 04-17-2013, 01:18 PM   #21
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We replaced a couple of places where the plywood was rotten, but left the rest in place. If it ain't broke...

After patching the rotten spots with fresh plywood, we treated all the parts of the floor that we could reach with penetrating epoxy - epoxy diluted with xylene to make it liquid enough to soak into the floor.

Then we covered the surface with epoxy mixed with a thickener that made it sandable. It takes way more of that powder than you would think. If it's too runny, it doesn't have enough thickener in it and it will be nearly impossible to sand, just like plain epoxy.

There are some pics on our blog.
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Old 04-17-2013, 03:29 PM   #22
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The floors looks almost perfect. I would not replace it but I would patch it. You can cut out small sections and splice in new sections by putting pieces underneath to attach to. I see one section at one of the corners but other than that is looks good.

Perry
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Old 04-17-2013, 08:15 PM   #23
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The floor looks water stained, but a photo doesn't show everything. If only stained, it just needs sealing. But if it has weak spots or mold or is swelled, it probably should be replaced. Only seeing it in person would tell.

But Bill M. says something important—it is always important to prevent water intrusion before it gets to the floor.

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Old 05-17-2013, 07:31 AM   #24
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Hello,
I have a question on the plywood subject. My Airstream has had several leaks over the years.The PO didn' t take care of things. The worst leak came from the refrigerator vents. Most of the floor had to be replaced in front of the entrance. I bought a sheet of 19/31 construction plywood, sealed the underside and installed it. That piece seems "springy". There seem to be more give with this plywood than the remaining original. I will add 5 mill birch plywood as underlayment and some type of vinyl tiles. I am worried there will be too much" movement". Should I be concerned? Should I remove it and look for some Stiffier Plywood? I want to do it right. Thanks for your input.
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Old 05-17-2013, 07:40 AM   #25
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Sorry about the sideways view...
Forgot to say that all fasteners are tight and it probably would not matter if I was installing carpet again. Thanks. Luc
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