How to fill void around tile-over shower tray going into non square corner

[Matt K]

Hi all,

Quick question re a tile-over shower tray I'm installing as part of bathroom renovation...

I have a Marmox square tile-over shower tray that I'd like to put into a corner of what will be my new bathroom, unfortunately the walls of the room meet at an angle that is slightly larger than 90 degrees, I can line up one side of the shower tray with one wall but will always have a small gap (2cm maximum) on one of the sides. My question is what should I use to fill the gap?

I'm planning to use the waterproof corners and tape before then tanking the wall in usual way (though if anyone has a good youtube video for how this should be done I'd love to have a reference!), could I use ply to fill the gap between wall and tray, then tape/tank over that perhaps?

I've included a couple of pics for reference.
http://www.matt-k.com/downloads/house/bathroom/floor/shower_tray_installation.jpg
http://www.matt-k.com/downloads/house/bathroom/floor/shower_tray_installation2.jpg

If possible I'd like to step the shower tray out from the wall by about 100mm (as per the second pic), in order to leave a gap for false wall containing pipes etc which will also become a shelf for bottles etc. Is this possible? What would I use between the wall and shower tray if I do this? Please tell me if this not something I should consider!

Cheers for any help, Matt

 

[Madrab]

Proper tanking is the key, make a box section then wrap and coat with tanking tape and membrane. Then use a shower to wall seal. http://aquastrap.com/

The 20mm gap can be bridged by a suitable filling and then covered by a suitably sized seal. Used these guys products several times and found them to be excellent.

http://www.sealuxseals.com/sealux_product_range.htm

 

[Matt K]

Thanks Madrab, really helpful. Out of interest, do you have a recommended tanking tape and membrane?

 

[Madrab]

I use tape on all the corners/edges, then use a liquid membrane to coat everything within the wet area including the tape, always give it 2 coats and cover extensively, the more the merrier IME.