Not sure if this might be a suitable solution. But highly flexible waterproof membranes available from tiling stores( preferable or hardware store). Apply thin reinforcing tape across crack and apply membrane to recommended thickness. Apply a tape around bottom of base as low as possible to peel off later and leave a neat finished edge. May require popping out waste grate so membrane can be continued into waste pipe then reinstall grate. Some colours are available in different brands such as white , blue green. A non slip grated shower mat cut to size covering the taped membrane line, so the different floor finish is mostly covered and not too visual. Not ideal but if the crack has occurred through the base flexing due to body weight or motion flexing it will probably keep doing so with minor epoxy or fibrelass repairs.

Hi 2abrest,
I replaced the floor on a friends campervan, it was a similar floor to that installed in some caravans, the plastic like substance was around 2 or 3 mm thick. The problem came about becasue the floor was not put down correctlly and supported, so walking on it caused the cracks. I had to remove the built in cassette toilet to take the floor out and put the new one in.

I would suggest you call Jayco but also follow up with caravan parts suppliers.

Peter

Re Flooring support.
The Plastic floor on the underside was not level, ie there was an indentation around the plug hole, and not enough of the wooden floor was taken out, so the plastic around the plug hole was raised with no support. Stand in this area while showering helped to make the crack.

Around the ouside edge of the floor was a 60mm horizontal section that then dropped down ( about 70mm) to the floor, standing on this horizontal section, put pressure on the plastic floor that had no support so cracks appeared.

The floor had the option of 2 plug holes, the second one was not used, but the wooden floor was not set up to allow the platic to seat correctly and so the plastic floor was not supported.

Peter

THE ONLY LONG TERM SOLUTION (Retired engineer)

I had the same problem in the motor home. Two part epoxy kept cracking and leaking. In the end I got

fed up and got 3  fibre glass kits with matting from Bunnings. Just follow instructions.

I sanded (course) the whole floor and applied it, brush on apply matting, brush over again.

about 4 cm up the wall as well which gives more strength. I ran a fan for the fumes though.

This stuff cures very quick, and took about an hour all up. Use gloves and face mask though !!

Three days later; lightly sanded (fine, to remove the gloss ) the new floor and painted it with a matching

coulor Auto" acrylic" car paint, spray can;  from Supa Cheap. Must be acrylic car paint not just oil base !

One mist coat, let dry then two final heavier paint coats. We used the shower 12 hours later, no problem.

I masked off with tape,still looks like new 4 years later. Solid as a rock. Did not remove the floor drain.

I placed a tight fit removable plastic tube in the drain hole and fibre glassed around it.

 

(A lot of stuff does not work as it's supposed to )

The motor home repair shop quoted me $350. to do the same job. Ha ha.... it's easy done.

Fiber glass ;; nothing beats it.

 

 

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Thanks for all the replies.... Still have the problem and planning what to do