Cement base for shower tray

[wibbit]

Good afternoon all.

I'm in the process of doing up my bathroom, which is a wooden floor (raised floor I think is the term) and have a question regarding "anti crumble" additive to cement when putting down a shower tray.

I'm placing a 800*1200 shower tray on to a single piece of ply as per the manufacturers instructions, however I'm slightly stuck.

They tell me to mix some cement/sand to create an absolutely level surface for the shower tray, and to add an anti-crumble additive to it.

I've done some searching and for the life of me I can't seem to find any thing that acts as an "anti crumble" solution.

At B&Q I found some thing that is meant to prevent cracks (lots of small bits of plastic fibre to be mixed in with the mix), but to me cracks are different to crumbling.

Any thoughts?

 

[Richard C]

and to add an anti-crumble additive to it.

I've done some searching and for the life of me I can't seem to find any thing that acts as an "anti crumble" solution.

I’ve never heard of that one & certainly never done it ; just use a weak, dryish mortar mix (soft sand), you’ll have no problems. Maybe it’s a Chinese derived installation manual

Use WBP not standard ply.

 

[wibbit]

and to add an anti-crumble additive to it.

I've done some searching and for the life of me I can't seem to find any thing that acts as an "anti crumble" solution.

I’ve never heard of that one & certainly never done it ; just use a weak, dryish mortar mix (soft sand), you’ll have no problems. Maybe it’s a Chinese derived installation manual

Use WBP not standard ply.

Thanks for that, it puts me at ease to an extent, and yes I think it is a Foreign language derived instruction manual.

I've got a plastersizer (used for plastering), so that should allow me to easily level the mix without over wetting it.

I believe its WBP and 18mm thick (same as the rest of the floor boards) as per the instructions.