Void under shower tray former

[Deadpoet65]

Void under shower former
My recently installed solid resin shower tray / wet room former has around 4mm flex across a dinner plate sized area in the middle. It's on a concrete base that was unevenly screeded over. The gap will likely be under 10mm. It has not yet been tanked or tiled but would be a pain to entirely reinstall. Instead of taking the former out I'm thinking to drill a few small holes and inject a solution ( epoxy/polyester resin/ expanding foam) from the top of the tray to fill the voids underneath. Any thoughts appreciated.

 

[ShaunCorbs]

Remove and re install with it fully beaded down

 

[IND_Nick]

As above, don't cut corners at this stage it will not end well. Never easy but always best to do it right 1st(2nd) time.

 

[Deadpoet65]

7 months on from my original post and the tray is functioning well. To stabilise the void I injected low-expanding memory foam into 20 holes drilled through the tray into the void. What was injected through one hole would eventually emerge from other holes giving confidence the foam had filled the entire void. 2 days on and the tray was entirely rigid and ready for tanking and tiles. Was this the optimum way to install the tray ? No. Was it a bodge ? I would argue not entirely as the remedial foam was not the primary support to the tray but complimentary. It provided stability that would later be further strengthened by the addition of large tiles that spread the load more broadly across the trays surface.
The time, cost and stress implications of removing what had been installed didn't bear thinking about.
Perfection shouldn't be the enemy of the good ( or at least workable solution).

 

[IND_Nick]

Good the hear your solution appears to have worked well. As you say there's always a workable solution if you put your mind to it. When paying a professional to do it though I'm not sure you'd want to see a can of expanding foam being used on you wet floor former!! Ha

 

[Ben-gee]

That’s why we do such things when the customer is not around!!!!!!!