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Old 10-13-2019, 03:13 PM   #1
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Wood floor joist

Hi , as some of you know, i am looking at moving up to a class a motorhome from 5th wheel. I am looking at tiffin , fleet wood bounder or south wind and newmar. I am looking at a 2018 Bay Star 3518. Looking at newmar it looks like they build on a wood platform , wood floor joist. The fleetwood i think is built with aluminum. I would think aluminum would b the preferrable choice. Wood warps, absorbs moisture, rots. I know newmar builds many RVís . But am i missing something, should that be a real concern . I would like to see what other folks think about it.
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Old 10-13-2019, 08:33 PM   #2
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I suggest you drive up to Newmar and take the long factory tour. Every RV I have ever seen has a chassis, and some wood foundation which the house is built upon. Newmar uses OSB which comes in 40' lengths, so the floor has no seams in it, if a cut is made, it's a swivel cut, because that locks those two seems together and they cannot move. Learned that at the tour. Aluminum floor would be prohibitly expensive, now their might be a layer of aluminum sheeting to protect the bottom of the coach, but not floor, cannot imagine that.
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Old 10-14-2019, 09:00 AM   #3
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What do you mean wood floor joists?
The Newmar I have has a steel tube superstructure (Newmar) welded to the steel frame rails (Spartan) with aluminum sheet, foam insulation and then OSB plywood and then carpet / tile finish flooring. No wood "joists".
The sidewalls use aluminum spars and the top are aluminum "joists".
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Old 10-14-2019, 01:53 PM   #4
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Wood joists? Really?

I know of no one building Motorhomes using wood floor joists. They all use aluminum or steel. They do use a OBS platform which is twice as strong as plywood and is water resistant. If you don't want to go to the factory and see how they're built you can go to YouTube and search Newmar factory tour and see how they're built.
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Old 10-14-2019, 02:00 PM   #5
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Yes, it is wood framing 16" centers. However, those sit on top of the frame's steel joists.


Heres the brochure for 2018 Baystar, and you can see a cutaway view in there.


https://newmar.imgix.net/wp-content/...hure-combo.pdf
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Old 10-14-2019, 10:33 PM   #6
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Yep, thats where i got it from, online brochure for 2018 , ( and i think it is still being made that way for all newmar coaches. I under stand the decking being osb, but joist? I would of liked to see aluminum or steel joist. I believe winnebago and fleetwood do an aluminum joist. I think there is more advantages to it..., no rot, not adversely affected by water, sturdy, less likely to twist, warp etc.
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Old 10-14-2019, 11:01 PM   #7
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Wood has better insulating and anti vibration properties for floors. There is a steel structure under the floor for strength.
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Old 10-15-2019, 06:46 AM   #8
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Quote:
Originally Posted by Jukenut View Post
Yep, thats where i got it from, online brochure for 2018 , ( and i think it is still being made that way for all newmar coaches. I under stand the decking being osb, but joist? I would of liked to see aluminum or steel joist. I believe winnebago and fleetwood do an aluminum joist. I think there is more advantages to it..., no rot, not adversely affected by water, sturdy, less likely to twist, warp etc.
Winniebago only shows the super structure and does not show the actual floor that goes on top like the Newmar brochure does.


https://winnebagoind.com/products/cl...superstructure
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