Floor rot/water problems - Fiberglass RV


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Old 09-08-2017, 12:40 PM   #1
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Name: Michael
Trailer: 17ft Bigfoot trailer
British Columbia
Posts: 63
Floor rot/water problems

Hello All,

My 86' 17ft Bigfoot has some ongoing issues with rot in the bathroom/just outside the bathroom floor. I have tried locating where water is getting in but not having much luck. Here's where I looked and what I'v done so far:

[
  • All windows have been removed and resealed using butyl tape.
  • All vent stack pipe covers have been replaced.
  • All water lines have been checked for leaking while the pump is running.
  • The fresh water tank has been filled and check for leaks. Not leaking.
There are no other wet spots on the floor, only where described. The only other thing to replace would be the small 9x9 vent in the bathroom. Any ideas on where else I can look or check would be helpful and appreciated...at a bit of a loss

Thanks!
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Old 09-08-2017, 05:23 PM   #2
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Name: Eric
Trailer: 1987 Casita 16
Illinois
Posts: 462
Could it be coming from when the shower is being used, or the toilet flushed?
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Old 09-08-2017, 09:42 PM   #3
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Name: JJ
Trailer: 2008 Bigfoot 25RQ
Idaho
Posts: 67
Is the rot on top, bottom?

I ditto on the shower/toilet. Have you checked the existing toilet flange?

If the connection between the toilet and the black tank has come loose or is cracked, every time you flush the water can spew out possibly getting the underlayment wet and pooling on the tank itself. Best bet is to crawl underneath, remove the underbelly material - coroplast?, inspect the tank for pooling and then check your connections. Have someone flush the toilet, run the shower, etc. . Hope that helps.
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Old 09-09-2017, 09:23 AM   #4
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Name: Tom
Trailer: Sprinter 'til I buy
Denver, CO
Posts: 944
Consider putting some food grade dye (not Rit) in your freshwater tank. You probably don't need to fill it. That might allow you to isolate the source, internal or external. Alternatively pour dyed water into shower, sink, & toilet drains. Perhaps into fill tubes? If you have an isolated suspect, test it first before dyeing your whole system. Pouring dye down the drain pipes would have the least impact.

Others may be able to suggest better alternate methods.
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Old 09-09-2017, 09:42 AM   #5
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Name: Jack L
Trailer: Sold the Bigfoot 17-Looking for a new one
Washington
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Also, check the water pump.
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Old 09-10-2017, 11:50 AM   #6
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Name: Michael
Trailer: Trail Cruiser
Alberta
Posts: 520
I would agree with the food dye (colouring) suggestion. Put some in your fresh water tank and use your plumbing, one piece at a time. Take your time as the leak could be slow, to allow time for the dye to show up.
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Old 09-11-2017, 08:29 PM   #7
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Name: Michael
Trailer: 17ft Bigfoot trailer
British Columbia
Posts: 63
Turns out is was the bathroom vent. Thanks a lot for all the great suggestions @EricAllyn, @jimKE, @Tom 72, @Jack L and @Mike L. Appreciated!
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Old 09-12-2017, 02:49 AM   #8
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Name: Gerry
Trailer: 1979 Boler 1300 / 1991 Casita Freedom Deluxe
Maine
Posts: 1,590
Thank you Mike for letting us all know that you've located the problem. I doesn't leave us hanging, wondering, and it gives others an idea of HMMM maybe that's where mine is leaking.
To many threads go with no response from original poster, getting back to us.
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