159" Otto Vahn - Ram Promaster Forum
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post #1 of 18 Old 02-14-2019, 01:29 PM Thread Starter
brrogers12
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Question 159" Otto Vahn

Hi All - Just starting my conversion and thought I'd start a thread to document our build and ask questions as necessary. (I know there are MANY threads on topics similar to this but I find the search function inherently difficult and convoluted).

My first question has to do with insulation...thinking about doing the Frost King duct insulation on the floor as a vapor barrier and then doing Polyiso. Has anyone had any experience with this method either good or bad. Let me know your thoughts. It's a fairly expensive product so want to make sure I'll be getting value out of it.

Can't wait to share our build with this amazing community. Thanks in advance for your help!
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post #2 of 18 Old 02-14-2019, 02:40 PM
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Polyiso is a vapor barrier

2014, High Top/159 WB, 2500 gas Promaster camping conversion. https://www.promasterforum.com/forum...ad.php?t=43121
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post #3 of 18 Old 02-14-2019, 02:47 PM
phil
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IMO, don't spend that kind for money and effort for a small gain.

Why do you need a vapor barrier?

The money for the Frost King would be better spent on a roof vent and dry heat heater, IMO

Last edited by phil; 02-14-2019 at 03:00 PM.
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post #4 of 18 Old 02-14-2019, 03:56 PM Thread Starter
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Why do you need a vapor barrier?
I know this is a pretty controversial topic: to vapor barrier or not to vapor barrier - *that* is the question.
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post #5 of 18 Old 02-14-2019, 04:00 PM Thread Starter
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My other big lingering question is how everyone tackled the screw and bolt holes in the flooring to prevent moisture from coming up?
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post #6 of 18 Old 02-14-2019, 04:01 PM
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Originally Posted by brrogers12 View Post
I know this is a pretty controversial topic: to vapor barrier or not to vapor barrier - *that* is the question.
I think this page has a good explanation and solution, I also use heat and ventilation to control the moisture level.
https://faroutride.com/condensation-moisture-van/

Last edited by phil; 02-14-2019 at 04:03 PM.
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post #7 of 18 Old 02-14-2019, 04:06 PM
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My other big lingering question is how everyone tackled the screw and bolt holes in the flooring to prevent moisture from coming up?
My floor is held down with the cargo tie down bolts, so no screws or glue.
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post #8 of 18 Old 02-14-2019, 04:07 PM
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New build! Have fun with it!
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post #9 of 18 Old 02-14-2019, 06:16 PM
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My floor is held down with the cargo tie down bolts, so no screws or glue.
Ditto. I used all of them to secure the plywood floor and poly-iso with 8mm flathead machine screws countersunk into the plywood. Poly-iso is an effective vapour barrier all by itself. I taped the poly-iso seams with red tuck tape, which also keeps them from shifting. Stuffing foam backer rod around the edges at the walls completes the job. BTW, the plywood/poly-iso combo is also plenty strong enough to span the floor channels, so don't worry about filling them in.

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post #10 of 18 Old 02-15-2019, 03:58 PM Thread Starter
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Quote:
Originally Posted by SteveSS View Post
Ditto. I used all of them to secure the plywood floor and poly-iso with 8mm flathead machine screws countersunk into the plywood. Poly-iso is an effective vapour barrier all by itself. I taped the poly-iso seams with red tuck tape, which also keeps them from shifting. Stuffing foam backer rod around the edges at the walls completes the job. BTW, the plywood/poly-iso combo is also plenty strong enough to span the floor channels, so don't worry about filling them in.
Did you (or Phil) have any other screw holes in the floor? My floor is covered with random screw holes throughout the cargo area. These are not the same as the bolt tie-down holes. I'm thinking of sealing the tiny holes with silicon. Thoughts?
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