Tanking shower walls and sealing around the existing shower tray

[Spinny]

I have just joined the forum and I'm hoping for some advice. I had a leak in my shower which now needs retiling. I have replaced the area of water damaged plasterboard with a sheet of aquapanel. The shower tray is remaining in place and I am now planning to tank/waterproof the three walls that make up the shower area above the 900mm tray. Firstly I would be grateful for advice on the best way of sealing the gap between the wall and the shower tray and secondly what tanking kit would you recommend.
Thank for your help

 

[Minmax89]

I would advise removing the tray to apply a flexible upstand (example classi seal plus) to the perimeter of the tray that abuts any wall. Then put the tray back in and bond the upstand to the wall. You can then add adhesive backed corner tape for any corners (or any change of plane) Then tank the walls (example aqua seal).
Read and Follow the instructions of both the upstand and tanking solution carefully.

Adam

 

[Ben-gee]

I would seal the gap with stixall, tank the walls using solution. Use the tape in the vertical corners and at the base of the wall - running it 4/5mm onto the top of the tray, this will be covered by the tiles.