Enlarged Hole where Black Water pipe enters floor - Fiberglass RV

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Old 06-18-2016, 12:39 PM   #1
Name: Scott
Trailer: Scamp
Posts: 30
Enlarged Hole where Black Water pipe enters floor

At the Scamp factory they cut a hole in the floor for the PVC pipe that goes to toilet? The hole they cut is bigger than the pipe. I just sealed the exposed non fiberglassed wood with Rosewood penetrating stain. I am wondering if I should spray foam or something else in the large gaps around pipe vs. flooring? Advice appreciated!


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Old 06-18-2016, 12:47 PM   #2
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Name: Floyd
Trailer: 2004 13 ft Scamp Custom Deluxe
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Not positive but I believe they use a wax ring to seal the tank to the floor around the outlet
Mine still looks like it did on delivery with no ill effects so far after 12 years.

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Old 06-18-2016, 12:55 PM   #3
Name: Scott
Trailer: Scamp
Posts: 30
Enlarged Hole in Floor

Hi Floyd. Is it ok then to have the hole in the floor where there is a big gap between the plumbing PVC black pipe in the picture and the floor? I was just worried about moisture accumulation.

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Old 06-18-2016, 02:46 PM   #4
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If it were me, I would foam it shut.
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Old 06-18-2016, 04:04 PM   #5
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Name: Tim
Trailer: '88 Scamp 16, layout 4
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If you sealed the edges of the wood I would not worry too much. If anything I might spray some non-expanding foam around it.
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Old 06-18-2016, 04:42 PM   #6
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Name: Gordon
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On mine (which has the shower), I can see the wax ring by looking up from underneath into the hole. I think (but would not swear) that the wax ring is installed to insure that water in the shower pan goes out the drain and not down the hole. If the wax ring deteriorates (or should I say when it does), then I think that shower water will run out the hole. If you seal the hole so water cannot drain, then, when the wax ring fails, the water will sit in the black water drain hole in the floor and the wood will rot. The wax ring is under the black water tank so you cannot inspect it from inside. Leaking water would be your clue that it had gone bad.

Now if you don't have a shower then ignore what I just said.

If you are only talking about sealing the cut edge in the hole and not the entire hole, then ditto.

If you used to have a wax ring then perhaps replacing it would be the best option, but it entails removal of the commode and tank, and cutting the black water drain, then replacing it all while using new drain pipe.

If I am wrong about any of this I hope someone more experienced with Scamp construction will correct me.
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Old 06-18-2016, 04:59 PM   #7
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Name: Jack L
Trailer: Bigfoot B-17 CB
Posts: 1,011
I would use some closed cell foam weather stripping material sold in rolls in home centers. It's east to jam some in the opening and while the aerosol foam would do a better job of sealing, this is easier to remove later if necessary. Not as messy to install too.
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Old 06-19-2016, 10:16 AM   #8
Name: Scott
Trailer: Scamp
Posts: 30
Thanks for all the input on this!Working on a wood insert for the shower floor today!

Happy Fathers a Day to all!

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Old 06-19-2016, 10:26 AM   #9
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Name: Robert
Trailer: Scamp
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I have 2000 19' w/shower & toilet. I just pulled my toilet & tank out a couple of days ago. Yes there is wax ring under the tank. My wood under the shower is in good condition. I believe I will coat the wood with something but I will not seal between the drain pipe & wood . I think this has too much potential to trap moisture in the wrong place.

The reason I pulled the tank is because I had black water on my shower floor after traveling from boondocking to my next destination. In the process of pulling the tank I found that the vent pipe elbow was never glued. I have plugged the bottom of the tank and filled the tank w/water. I even plugged the vent fitting & pressurized the tank. No leaks. I can only figure that the black water leaked up & out of the not glued vent fitting. Another thing is that only 3 of the 4 mounting points had screws & holes in the shower floor. I will put it all back together after the cleaning is complete & I get the drain pieces. Thanks

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