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Old 07-22-2020, 10:01 AM   #1
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Lumber for floor joists?

What sort of wood is used for floor joists in a trailer? Regular pine? Treated pine? Spruce? something else?
I am replacing a few and want to make sure I do it right.
I also assume the same wood type for wall studs too.
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Old 07-22-2020, 10:38 AM   #2
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I would us treated lumber, it will stand up to bugs and any moisture intrusion.
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Old 07-22-2020, 10:42 AM   #3
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I doubt any manufacturer is using treated based on cost. Any normal stud wood material should be adequate.

As far as the walls...if they are laminated...per your post in the other thread, there probably won't be much, if any. Laminated walls generally don't have much in them except perhaps some for hung cabinets to attach to and around a perimeter. Think "surfboard"...that's what a laminated wall is. The laminated sandwich is the structure with very little else.

You might find this short read helpful for wall construction:

RV sidewall construction | RVwest

Do a search on RV Delamination Repair and you'll get all kind of returns that will provide you with a lot of information so you can choose wisely what you do next.

Here is a video from Keystone showing laminated wall construction. Actually, they have quite a bit of aluminum studs/supports in their sidewalls, but you'll still notice that it's not 16" on center or anything. I've been to Winnebago's motorhome facility in Iowa twice for tours. I'm amazed how little structural support metal is in their sidewalls. Around edges, windows, some plates for hanging cabinets, not much else. So it does vary from mfg to mfg.



Good luck! I wish you the best.
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Old 07-22-2020, 10:45 AM   #4
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Fir.....like 2x4's.....
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Old 07-22-2020, 11:16 AM   #5
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Correct me if I'm wrong but I think treated lumber is not used for structural support.
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Old 07-22-2020, 05:21 PM   #6
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Correct me if I'm wrong but I think treated lumber is not used for structural support.
It's what they use for decks
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Old 07-22-2020, 05:28 PM   #7
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Lumber for floor joists?

Pressure Treated should be approximately same strength if dry. Incised pressure treated is derated up to 20%.
If using treated I would highly recommend using kiln dried treated lumber.

Lumber that may be in wet service like a deck is also derated as strength is lowered. Usually means just have to upsize some on joist and beams.
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Old 07-23-2020, 09:21 AM   #8
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Any kind of pressure treated lumber is not recommended for interior walls. The pressure treatment infuses poisonous chemicals to prevent microbe growth. Vapors are harmful to your health. It the bottom of your TT is enclosed, do not use it there either.
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Old 07-23-2020, 09:27 AM   #9
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Quote:
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Any kind of pressure treated lumber is not recommended for interior walls. The pressure treatment infuses poisonous chemicals to prevent microbe growth. Vapors are harmful to your health. It the bottom of your TT is enclosed, do not use it there either.
In times past this was true but not anymore.

https://www.prowoodlumber.com/en/Blo...swer%20is%20no.
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Old 07-23-2020, 04:36 PM   #10
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Few trailers even have wooden floor joists anymore, probably not in 25-30 years. Sometimes just a couple metal ribs between the frame rails and a layer of plywood, insulation, and more plywood. The typical RV trailer construction bears little resemblance to residential floors with large joists on 16" centers. Or even 24" centers as in many mobile homes.
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