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Old 06-24-2004, 12:35 PM   #29
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Paul,
Can you do one test with cloth matting and one without? And one with polyester resin? And different amounts of hardener? How about West Marine vs System 3?
Please report results and confidence levels. Please randomize variables.
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Old 06-24-2004, 12:56 PM   #30
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Actually, blind examineers would be fine. Do you think the matting would matter? I wasn't going to use any. There must be a reason that this is not a common approach on the forum. Where's Andy the Wise?
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Old 06-24-2004, 01:16 PM   #31
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Quote:
Originally Posted by markdoane
Paul,
Can you do one test with cloth matting and one without? And one with polyester resin? And different amounts of hardener? How about West Marine vs System 3?
Please report results and confidence levels. Please randomize variables.
Paul - Please cc: me with the results

Don - Now THAT was funny!
Quote:
Originally Posted by psychpw
Actually, blind examineers would be fine. Do you think the matting would matter? I wasn't going to use any. There must be a reason that this is not a common approach on the forum. Where's Andy the Wise?
No need for matting; This is for water resistance, not strength. Plus, matting would soak up more resin thereby adding more weight. For some reason, I doubt Andy's place uses much, if any, resin. Hopefully he will catch this post & respond accordingly.

Tom
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Old 06-24-2004, 01:38 PM   #32
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If you are going to seal the plywood with epoxy without fiberglass mat, flex will not be a problem. The thin viscocity epoxies penetrate into the wood and essentially become part of the wood as opposed to being a topcote only. The fiberglass mat should be used sparingly from a weight perspective. I plan on using a 6" tape to go around the perimeter of the floor with the tape wrapped around the edge of the ply so I have a 2.3" strip on the top and the bottom while the end grain is completely covered. I am also considering using a 2'x2' mat in the doorway to help as well. There shouldn't be any issues with this type of setup.

I don't think it would be necessary or advisable to completely fiberglass the floor (although it can be done). Weight is the major factor. My wooden canoes are very flexible and can take tremendous abuse without cracking. I have an uncompleted one without seats, thwarts, etc that you can twist and turn with no damage to the epoxy/fiberglass. I was using lightweight 4 and 6oz cloth.

I really like the composite idea. I had already planned on using the honeycomb composite for use as a substrate on the cabinet tops with thin 1/8" corian. I have my dad researching it further. He works for a major airplane outfitter.

My .02c

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Old 06-24-2004, 02:13 PM   #33
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Overall floor cost?

How about the overall cost of the new floor with the various approaches?

I would like to use something that would be a permanent solution but I am certainly not willing to pay an astronomical amount to do it. Here are rough cost estimates that I have looked at so-far for a full replace of my floor. I would need 7 - 4'x8' sheets to fully cover my 31' AS.

1.) Preasure treated plywood (the non-toxic variety).
CCX plug and touch sanded about $69 per sheet (7*69 = $483)
CDX about $50 per sheet (7*50 = $350)

2.) 11/16" tounge and groove OSB sub-floor
about $29 per sheet (Lowes) (7*29 = $203)

How much for enough epoxy to coat about 200 square feet of plywood on both sides? I estimated that I would need about 2 gallons of Rot Doctor at about $150.

What kind of numbers are you guys seeing for your various approaches?

Malcolm
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Old 06-24-2004, 02:27 PM   #34
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Thats about what I figure except I should be able to use the original 1959 plywood floor with minor patching. I'll soak it with CPES and then an epoxy primer and epoxy urethane top coat, then strip the walls. Let the expoxy protect the floor. Looking at about 250 total I would think for the floor stuff. If I have to replace the floor price goes up as I really like the plymetal concept. Everything is out but the tub.
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Old 06-24-2004, 03:34 PM   #35
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I have yet to understand why everyone wants to use pressure treated plywood for an interior floor. Maybe where you live it lays flat, but everything I have seen around here is a warped, rough mess. And I would NEVER put any sealing coats on anything pressure treated unless it was allowed to dry for a year or two. Sealing in all that moisture is the kiss of death for wood products in spite of what ever chemicals it has been subjected to.

And, maybe your Airstream's original floor was a moldy mess that should have been treated at the factory for moisture resistance. Mine was not. I felt no need to apply "just in case" coatings to the original decking because it survived 37 years without my help. With the exception noted in my above post, I did nothing to the new decking I installed.

Maybe I am deluding myself, but with my new-found appreciation for how important it is to keep the seams etc. on the outside sealed against water intrusion, I would like to think that I will maintain my Overlander, AND know where the trouble spots are, in such a way that soft decking will not be an issue while I am enjoying its use.

I would say more, but I need to take my medication now...

Tom
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Old 06-24-2004, 05:20 PM   #36
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I am the only one...

Tom,

Actually I seem to be about the only one suggesting preasure treated as an option. If I were to use preasure treated I would not intend to coat it with anything (other than the floor covering of course). The hope being that the preasure treating materials do a good enough job and save me the trouble of coating with anything else.

It seems to me that most of the people that have commented on their approach in the forums favor some form of un-treated exterior grade plywood that is then treated with some sort of sealer. The two contenders that I have seen most in the forums appears to be epoxy or in one or two cases Thompsons Water Seal.

So far I don't remember having had anyone say that they would whole heartedly endorse using OSB even though it appears that the AS factory may be using it.

Most everyone seems to like the idea of having a material that would never have a problem with rot. The entry level costs for some of the more exotic solutions seem to be a bit too pricy still.

I am definitely intending to take various steps to help ensure that water is not a problem in the future (during the time that I own my AS anyway). This being the case you may be right that totally un-treated plywood might very well be just fine. I still feel a little uncomfortable with not having anything protecting the wood though.

The most vulnerable part in my mind is what happens around the edges since the body is held on largely by the connections from the u-channel to the edge of the plywood (or not held on in some places on my unit). At the very least I think that I will be adopting an approach that at least protects the edges. I am still pretty likely to take an approach that I documented elsewhere in these forums. I am actually looking at TREX deck lumber with the thought of making an edge band all the way around that is rot proof. That is one of the reasons that I thought OSB might make a good floor - use if for everything except around the edges.

I need to make a decision pretty soon - maybe over the weekend. I need to get the work done and proceed with other aspects.

Malcolm
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Old 06-24-2004, 05:20 PM   #37
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Tom

You raise some good points - I've often wondered if sealing with epoxy is really needed - when you put screws/bolts through it, seems like you would defeat the purpose of the epoxy............... Having said that, I've used eposy on my edges - figure it can't hurt.

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Old 06-24-2004, 07:07 PM   #38
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Quote:
Originally Posted by malconium
Tom,
Actually I seem to be about the only one suggesting preasure treated as an option.
In this thread, "Yes". I foraged through a multitude of threads when I was contemplating my floor repairs that suggested pressure treated lumber. If nothing else, bear in mind that pressure treated lumber was created more to keep bugs from destroying your wood as opposed to rot.

Quote:
So far I don't remember having had anyone say that they would whole heartedly endorse using OSB even though it appears that the AS factory may be using it.
Earlier in this thread, I allowed that I used it in my floor repair. To me that was an endorsement. I try not to tell people what to do, only present case examples. If you prefer more sentiment, I whole heartedly endorse the use of OSB.

Quote:
I still feel a little uncomfortable with not having anything protecting the wood though.
No problem with that. You need to do what you are comfortable with.

Quote:
I need to make a decision pretty soon - maybe over the weekend. I need to get the work done and proceed with other aspects.
I fully understand schedules. Normally, I would say PM or call me if you think I could help you decide your course of action. But I am leaving at 0800 in the morning to return Sunday afternoon. Please drop me a PM if you think I can help.

Tom
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Old 06-25-2004, 06:31 AM   #39
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[QUOTE=malconium]Tom,
So far I don't remember having had anyone say that they would whole heartedly endorse using OSB even though it appears that the AS factory may be using it.

Does it bother any one but me that Airstream is using a "product" that (leaving personal feelings aside) That costs less than plywood and when exposed to moisture falls apart. I havent noticed a price rebate to the end user that reflects the cost savings. If in fact Airstream is the best of the best maybe they could use the best materials from the start. If some one could tell me how many sheets are in each length I will go to my neighborhood lumber yard and figure the cost diffeence per sheet. They still load your lumber for you, tie it up and put the red flag on for you..... Some days I just stop in so they will say my name. If any one is ever near Richmond Va stop in and visit a world class family owned business. Only open M-F till 4:30 but call if you are running late and they will wait.....(no kidding)
http://siewers.com

Abe
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Old 06-25-2004, 07:24 AM   #40
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Quote:
Originally Posted by vajeep
Does it bother any one but me that Airstream is using a "product" that (leaving personal feelings aside) costs less than plywood and when exposed to moisture falls apart.
I believe you are confusing OSB with particle board.
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Old 06-25-2004, 11:37 AM   #41
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floor material?

Quote:
Originally Posted by tcwilliams
I believe you are confusing OSB with particle board.
My bad, before I go any farther, What product does Airstream use as their flooring? I thought they were using OSB? Is this an incorrect statement?
Some body that knows please let me know what product is used and how they know that this product is used.
Thank you in advance,

Abe
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Old 06-25-2004, 01:45 PM   #42
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Quote:
Originally Posted by vajeep
My bad, before I go any farther, What product does Airstream use as their flooring? I thought they were using OSB? Is this an incorrect statement?
Some body that knows please let me know what product is used and how they know that this product is used.
Thank you in advance,

Abe
The 22-footers use a single piece of OSB for the entire floor. As far as I know, all other models use T&G plywood; I know that the larger models do. If any other models use OSB, it would be the 16' and 19'.

When I put the cork floor in my 2003 22' International, it was obvious that the floor was a single piece of OSB. I just looked at a small piece of OSB that I cut out under the seats that was slaying behind the shop for 2 years. It has blackened, but it has not deteriorated in any way that I can see.
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