Big Foot leaking toilet floor damage fix - Fiberglass RV
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Old 07-14-2018, 05:33 PM   #1
Junior Member
Name: Charles
Trailer: Big Foot
Posts: 12
Big Foot leaking toilet floor damage fix

“There is risk in a used one” …

Soft spot in front of bathroom discovered by barefoot feel. No smell, no visual cues, no wetness above the floor. But an extensive wet area developed over time beneath the linoleum. Rot and mold was present.

The installed floor flange and rubber seals were not correct for the Dometic D 510 H toilet. Said flange was cracked … silicone sealant was present from a past un-professional & unsuccessful fix attempt.

My fix:

• Peeled back linoleum for inspection.
• Cut out all damaged floor structure.
• Treated area for mold and extensively dried the open floor structure.
• Fabricated replacement subfloor structure of a “sandwiched” ½ inch plywood bottom sheathing, wood structure joist/lattice support, interspersed with layered ½ inch Styrofoam sheathing insulation,& then top floor sheathing of another ½ inch plywood … leveled by adding some 1/8 inch plywood shim as needed.
• Installed entire trailer new waterproof laminate vinyl floating plank floor & trim over existing linoleum.
• Cut down a correct RV toilet flange, “ABS plastic repair welded” it to the existing (incorrect) floor flange. Shimmed the toilet mount as required. Installed toilet with the correct toilet seal.
• Btw, also replaced the toilet ball valve seal (it was slowly leaking t.bowl water) while at it all.

It seems to be working.
So currently I’m happy … and I do really like having new flooring!

(sorry no pics of the mess that was under there ... wasn't exactly in a picture taking mood as I dealt with that)
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Old 07-14-2018, 08:24 PM   #2
Junior Member
Name: Charles
Trailer: Big Foot
Posts: 12
P.S. Meant to tell you that I posted the above for three reasons ...

#1 I'm just happy/celebrating to get it done!

#2 To tell you that RV toilet repairs by themselves are pretty easy & simple ...
(assuming the toilet was correctly installed ... mine was not) ... anyway don't be afraid to pull your toilet.

#3 To let you see a pic of what is under a Big Foot floor ... I always knew what my Scamp floor was all about ... I never needed to dissect my Casita floor ... and above in the 1st pic you can see the BF construction ... bottom fiberglass skin (beneath which is frame & black tank) ... dark outline of where wood joists were, thick styrofoam insulation, plywood deck and linoleum over the top.

Cheers, CJ
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