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Old 04-30-2019, 11:34 PM   #1
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Large Holes in the Moisture Barrier!?!?

While under the trailer (2019 Salem FSX260RT) cleaning up the factory wiring, I noticed that there were places where the holes in the moister barrier like where the low point drains and the main wiring to junction box pass through that were filled with black expanding foam...sealing the opening in the plastic to the floor...and then there are these (see pics) places where the pipes from the toilet to the black tank and shower to the grey tank have none...(never mind the loose piece of plywood trapped in there too).

My questions is...should they be sealed with expanding foam like the others? ...if so can I just use any old foam from the local hardware store?

I plan on calling and emailing FR the pics and question...but I figured I would get a faster answer here on the forum!
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Old 05-01-2019, 12:27 AM   #2
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You can use expanding foam from any home center. hardware store or walmart. I would use the type that doesn't expand so much it puts pressure on the tanks as they may be pushed down causing the pipe to pull apart.


What you are calling moisture barrier is just close knit nylon webbing much like the bags you get bird seed and animal feed in. Look closely at your photos and you can see the individual strands hanging. It slows the penetration of water so splashes will drip off but will not stop water from soaking through if the rv sits in water that deep.
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Old 05-02-2019, 11:23 AM   #3
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I had some holes in the barrier around my pipes as well. I had a partial roll of black moisture barrier on hand and cut off a square and slit it. Using spray adhesive, wrapped the barrier around the pipe and stuck to existing barrier. Seems to be holding up well.
The manufacturer did a good job filling the gaps in the floor penetration with foam so I did not have to bother with that.
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Old 05-02-2019, 11:59 AM   #4
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If you get landscaping foam, it's a grey color and will be less obvious. You could also use gorilla tape instead. Considering the size of the opening, I think gorilla tape would work better.

That's too insignificant to worry about the dealer or manufacturer doing something. Save yourself the time and aggravation and take care of it yourself. Pretty simple and inexpensive to take care of.

Is that a piece of rigid foam or plywood sitting on the Darco fabric?
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Old 05-02-2019, 01:41 PM   #5
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I used the mice resistance expanding foam. Found it at Lowes
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Old 05-03-2019, 09:14 PM   #6
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Quote:
Originally Posted by myredracer View Post
If you get landscaping foam, it's a grey color and will be less obvious. You could also use gorilla tape instead. Considering the size of the opening, I think gorilla tape would work better.

That's too insignificant to worry about the dealer or manufacturer doing something. Save yourself the time and aggravation and take care of it yourself. Pretty simple and inexpensive to take care of.

Is that a piece of rigid foam or plywood sitting on the Darco fabric?
Its a piece of loose plywood...I think I will cut a slit big enough to get it out before I repair the holes...
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Old 05-05-2019, 10:08 AM   #7
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"mouse resistant" is a great idea. I wasn't aware of that product, but will look for it. I might suggest starting with a little of the foam then use brass wool (not steel which will rust) and more foam and more brass wool...until the hole is filled and then gorilla tape to finish.
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Old 05-05-2019, 07:50 PM   #8
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Large Holes in the Moisture Barrier!?!?

Whoever worked on that part of the RV was prob hung over and just cut the crappy holes and did not put the foam in. Its s shame for them not to not have any pride in what they do. And oh yea scrim shield tape is your friend.
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