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qhumberd
Moderator
Cracked Shower Pan
I have a 2017 T@b 320 Boondock with a shower pan that has developed multiple cracks. I previously repaired two cracks a couple of years ago by drilling small holes and applying Flex Glue. Recently, I discovered a new crack.
I believe the cracking is due to a lack of support under the pan, exacerbated by the weather extremes in my area. An RV technician I use for more complex repairs suggests a repair method that involves drilling holes through the pan and filling the void underneath with up to three cans of expanding foam. After the foam hardens, he trims and smooths the excess. He claims this provides support and is waterproof.
I am concerned about potential damage to any mechanical parts located under the pan and toilet area. I would appreciate any thoughts or experiences others have had with this type of repair. Thank you.
Comments
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@bruja65, the below discussions show what the area under the shower pan looks like:
https://tab-rv.vanillacommunity.com/discussion/5025/just-fyi-on-what-is-under-the-shower-toilet-floor
https://tab-rv.vanillacommunity.com/discussion/comment/82182#Comment_82182
NOTE: If you look at the photos in the second link, you can see that there is some limited access to the area below the shower pan, which you can get to by removing the black cover (box) that surrounds the shower drain pipe (P-trap.)
These videos (3 parts) provide a solution similar to what the RV technician suggested:
https://www.youtube.com/watch?v=OSmotwjvuGo&list=PLkvn7Q21IZaJF6ydrwcDoEvROETxF-p8o
https://www.youtube.com/watch?v=VTFmJbjbPRQ&list=PLkvn7Q21IZaJF6ydrwcDoEvROETxF-p8o&index=2
https://www.youtube.com/watch?v=jsKApHNJqgI&list=PLkvn7Q21IZaJF6ydrwcDoEvROETxF-p8o&index=3 2019 T@B 320 S Boondock Lite; 2025 Toyota Tundra CrewMax 4x4
(Alde: 3020; Refrig: Isotherm Cruise 65 Eleg; Battery: BB 100Ah LiFePO4; Solar: Renogy 220W Portable Suitcase w/ Victron SmartSolar MPPT 75/15 Controller; Victron BMV-712 Battery Monitor w/ Shunt; Pwr Cntr: PD-4135KW2B; EMS: PI-HW30C)
Greg & Marlene (Tucson, AZ) -
@Bayliss Thank you for the resources. I just need to decide do I use foam or outright replace as I got some good sized cracks. If I go the foam route, what would be the best way to disguise the cracks? More Flex Glue, Flex Tape? I'd like to sell in the next year.

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@bruja65, I do not have any helpful suggestions, primarily because I have not had to deal with this particular issue. However, I found this discussion thread (which has the same videos I sent you), which may be of interest to you:
https://tab-rv.vanillacommunity.com/discussion/14983/squeaky-moving-bathroom-floor-cracked-shower-pan-tab-400#latest
Although not the particular issue you trying to resolve, maybe there is something in this discussion that will spark a different approach:
https://tab-rv.vanillacommunity.com/discussion/8929/crack-in-shower-pan#latest2019 T@B 320 S Boondock Lite; 2025 Toyota Tundra CrewMax 4x4
(Alde: 3020; Refrig: Isotherm Cruise 65 Eleg; Battery: BB 100Ah LiFePO4; Solar: Renogy 220W Portable Suitcase w/ Victron SmartSolar MPPT 75/15 Controller; Victron BMV-712 Battery Monitor w/ Shunt; Pwr Cntr: PD-4135KW2B; EMS: PI-HW30C)
Greg & Marlene (Tucson, AZ) -
Thank you! This is very helpful.
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