Hi All

I need to seal a shower tray but the tray is 0.5"-1" away from the wall at
the back (the wall facing you as you walk into the cubicle). I have filled
the hole with plumbers mate putty and now I'm not sure what to do next.

I could fit a long thin strip of WBP ply over the gap along the length of
the back wall so that it over hangs across the tray by half an inch or so,
then I could seal / stick it to the walls / the shower tray with no more
nails or silicone or something where the ply meets the tray, then tile over
the ply and seal with grout. Does that make sense? I assume nothing will
stick to the putty I have used. Would someone walk me through the process of
what I should do / not do to seal a gap like this?

Thanks

Haymish