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Old 12-15-2018, 03:31 PM   #1
sweetlou
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Underbelly covering

I want to ask if anyone has used plywood to cover the underbelly of 5th wheel?
I was thinking of doing this but I got to thinking if it would stay in place while underway!



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Old 12-15-2018, 04:11 PM   #2
sourdough
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My bigger thought would be what are you going to do to keep it from rotting?
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Old 12-15-2018, 04:12 PM   #3
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I can think of two problems you'll face right off the bat:

1. Plywood is far too heavy to use and once it gets wet, even heavier.
2. Plywood is not waterproof, once it gets wet, it will start to rot/deteriorate. Even marine plywood is not "completely resistant to the damaging effects of water".

Coroplast is a corrugated plastic sheeting that is lightweight, not affected by water and much more durable as an undercover than wood.

Another product, DARCO, is a plasticized fiber sheeting (think blue plastic tarp) that would also provide a suitable underbelly covering. In fact, it is used by many (probably most) RV manufacturers to line the wheelwells in towable RV's.
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Old 12-15-2018, 05:31 PM   #4
fjr vfr
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[QUOTE=sweetlou;319024]I want to ask if anyone has used plywood to cover the underbelly of 5th wheel?
I was thinking of doing this but I got to thinking if it would stay in place while underway!

Why?
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Old 12-16-2018, 12:42 AM   #5
sweetlou
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Thanks for information.
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Old 12-16-2018, 06:21 AM   #6
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Coroplast is your best option, easy to work with and durable, I used 4'X8' sheet and cut to fit. I had to work around inboard mounted shocks, but with using heavy gauge steel building studs it worked out well.
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