Tanking a wet room

[Wardle tiling]

can someone reccomend a good membrane or paint for tanking over marine ply in a shower area as i cant get a former in needs to be water tight.

 

[White Room]

Ply in a shower area...I'd be changing that for starters...

 

[PHG Dave]

can someone reccomend a good membrane or paint for tanking over marine ply in a shower area as i cant get a former in needs to be water tight.

Why can't you fit a proper former in?
How have you formed the required fall or located/fixed the drain?

 

[Wardle tiling]

Why can't you fit a proper former in?
How have you formed the required fall or located/fixed the drain?

Cant get a former in or shallow drain as have a supporting joist i need to get over so was going to send the water with a small fall formed with flexible floor adhesive with a membrane from back of shower with a shallow fall over the joist and into a gulley drain cant send the drain any other way once tested for water tightness i will tile

 

[PHG Dave]

Any pictures?

 

[Casper]

Drill thru the joist, any 2" hole near the centre of a beam will not weaken it