Fiberglass rigs with plywood bottoms - Page 3 - Fiberglass RV


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Old 09-17-2015, 09:13 AM   #29
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Fiberglass rigs with plywood bottoms

Actually I just looked that up, John, because I was curious how much weight. Looks like three-quarters OSB adds about 22 pounds over three-quarters plywood, assuming about 64 sq ft of material.

http://www.nachi.org/osb-plywood.html
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Old 07-09-2017, 07:10 PM   #30
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Just bought a 17' boler

We have decided to move from our current 13' boler to a 17' model. I recently purchased one locally that looks like it has the usual wear and tear but solid.

My question is: Has anyone applied fiberglass to the bottom/underside of the floor? This model has fiberglass inside and exposed plywood on the bottom. wondering if it is worthwhile for longevity?
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Old 07-09-2017, 07:42 PM   #31
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Whatever material is used in the floor I think all manufactures encase it in fiberglass. I am actually not sure what Scamp uses, there is no mention on their website, From personal experience my previous Casita used OSB (which I am not a fan of), my current Escape does use marine grade plywood in the floor fully encased in fiberglass
Not the case unfortunately. Many do not encase the wood floor.
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Old 07-09-2017, 09:27 PM   #32
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Encased floor or not, OSB in my humble opinion is a poor choice for the floor. So you save a few bucks over plywood, and lose strength in the process. Yes there are tradeoffs and cost decisions that have to be made in lots of different areas, but an OSB floor - nope.
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Old 07-09-2017, 10:43 PM   #33
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Jim Palmer at Eggcamper always coated the top of his plywood floors with FG resin, but never the underside. He said the wood must breathe and let any trapped moisture escape somehow or it could rot. And wetting from the road during rain doesn't hurt the wood, he said, because it does not sit on the wood long enough to really soak in.

Does Escape coat their plywood on all surfaces with resin, or does it sit on a molded fg shell like Casita's floor? I assumed the latter, but could be wrong.

Use exterior grade plywood, which has the plies glued with water resistant adhesive. Or marine plywood if you want to be extravagant.
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Old 07-09-2017, 11:35 PM   #34
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Originally Posted by Matt4483 View Post
We have decided to move from our current 13' boler to a 17' model. I recently purchased one locally that looks like it has the usual wear and tear but solid.

My question is: Has anyone applied fiberglass to the bottom/underside of the floor? This model has fiberglass inside and exposed plywood on the bottom. wondering if it is worthwhile for longevity?
Since Boler's haven't been made for a good long while and if there's nothing wrong with the floor and it's never been replaced, why worry about it? Obviously if it's original, it's lasted a good long while and will for many more as long as you do proper maintenance.
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Old 07-09-2017, 11:50 PM   #35
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Encased floor or not, OSB in my humble opinion is a poor choice for the floor. So you save a few bucks over plywood, and lose strength in the process. Yes there are tradeoffs and cost decisions that have to be made in lots of different areas, but an OSB floor - nope.
If your house was built in the last few decades it is surely made of OSB!
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Old 07-10-2017, 05:28 AM   #36
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Originally Posted by Mike Magee View Post
Does Escape coat their plywood on all surfaces with resin, or does it sit on a molded fg shell like Casita's floor? I assumed the latter, but could be wrong.

Use exterior grade plywood, which has the plies glued with water resistant adhesive. Or marine plywood if you want to be extravagant.
Escape uses marine grade plywood, and it's encased. Nothing on the bottom of the trailer but the shell. I think you're right about not coating the bottom of the floor on trailers where the wood is exposed. There's probably some validity to the theory of letting it dry.

About OSB specifically, I know some will say they use it on the floors in homes. Yes, but it's an entirely different application than in an RV. Your home's floor doesn't go bouncing down the road exposed to the elements.

Unless of course your home IS your RV, then it becomes even more critical.
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Old 07-10-2017, 12:39 PM   #37
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As a retired adhesives guy, who supplied both plywood and OSB manufacturers with adhesive, I for one do not like OSB for an application where it will get exposed to moisture. Plywood floor might cost manufacturer $100 more per rig. Marine plywood would be more.

Eventually I think manufacturers will all go the Oliver or LS route, using a floor that does not rot when wet.

While OSB adhesive has some similarities with plywood adhesive, it's cut with the post addition of urea and water, to cut cost. Adhesive is much more important to OSB given the small wafers that are glued together versus large sheets of veneer. It's no wonder OSB is cheaper. 90% reduction in labor cost, any species of wood works, they just shave the end of a chunk of wood. Meanwhile, a large log is lathed down into a long sheet to make plywood, with the center core wasted or converted to landscape timber or similar.
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Old 07-10-2017, 04:08 PM   #38
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Eventually I think manufacturers will all go the Oliver or LS route, using a floor that does not rot when wet.
I agree with you 100% on OSB Bill, but not on what the manufacturers will eventually do. I think most manufacturers will do what they've always done - and that's whatever they can get away with and still sell trailers.
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Old 07-10-2017, 06:45 PM   #39
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Yes I guess I agree. Two manufacturers in the US, I won't mention names, have shown little to no interest in upgrading their product. Eventually they may be drug along as competitive forces intervene.
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Old 07-10-2017, 07:07 PM   #40
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Yes I guess I agree. Two manufacturers in the US, I won't mention names, have shown little to no interest in upgrading their product. Eventually they may be drug along as competitive forces intervene.
That's key. Competition means better products. Always has.
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Old 07-10-2017, 08:09 PM   #41
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My 1986 Scamp has a factory resin coating on the topside of the floor. The underside exposed floor has no coating. This allows the wood to dry when wet from driving down the road. Without the ability to dry the core wood would retain moisture and then dry rot.
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Old 07-11-2017, 01:10 AM   #42
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Originally Posted by thrifty bill View Post
Yes I guess I agree. Two manufacturers in the US, I won't mention names, have shown little to no interest in upgrading their product. Eventually they may be drug along as competitive forces intervene.
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That's key. Competition means better products. Always has.
What competition? What competitive forces? Speaking as the owner of one of the nameless brands, I can say with certainty the Scamp 13 has no direct competition. Casita has abandoned that segment. There are several new 13' models on the market, and they all cost over $20K once they are fitted out comparably to a Scamp 13S1 with the basic option package, which retails for about $12K. The only thing they really have in common is size. They are certainly not aiming for the same market segment.

As to upgrades, the nameless companies have both made hundreds of incremental changes over the years. Most constitute improvements.
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