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Old 05-20-2018, 10:18 PM   #1
Join Date: Jan 2018
Location: Alabama
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Year: 2001
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Plastic Sheeting under the subfloor?

Ok I've prepped my floor and now I am about to lay down insulation and Plywood.
I've seen pics of people putting different plastic sheeting down under the insulation between the metal floor and the insulation.
I am concerned that if water gets under the insulation if will really just sit around under the plastic and cause rusting.
I've treated the existing rust and painted the floor with Rustoleum paint.
Should I now cover it with plastic before I put down the insulation and plywood?

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Old 05-20-2018, 10:31 PM   #2
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That's an unnecessary step with potentially harmful consequences.
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Old 05-20-2018, 10:38 PM   #3
Join Date: Jan 2016
Location: Greater Boston
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I'm not sure its going to really matter. Since you're insulating, there shouldn't be very much sweating from the metal. If water gets in, it will get into the insulation, and over time, rust the floor. If you put plastic down, the water will end up under the plastic, and over time, rust the floor.

I think I'd just paint it with a couple of coats, and forget about it. Most of these buses have gone 10-15 years without fully rusting through - with leaky windows, windows just plain left open in the rain, and being hosed down inside every now and then. No more water inside, no more leaks, and a few good coats of paint should do the trick.
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Old 05-21-2018, 04:24 AM   #4
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Originally Posted by Twigg View Post
That's an unnecessary step with potentially harmful consequences.
I agree. No need for the plastic.
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