1st Job: slate tiles what thickness of ply????????

[jon moore]

Hi need some help, just about to do my first slate floor would it be ok to use 4mm ply as floor height is an issue would this be ok to use?

hope someone can give me some advice thanks

[Dave]

Hi jon and welcome....4mm ply...sorry NO...

What substrate do you have...floorboards...chipboard etc..?..is it up stairs or down stairs.....

[jon moore]

It is on to floor boards and downstairs in kitchen, the reason for height issue is there is not alot of room above the washer under the worktop.
thanks for reply

[Dave]

6mm hardi backer is good....make sure the floor boards are solid and well screwed down then use a flexible adhesive to stick the boards down...then scew the hardi backer down every 200mm and around 50mm in from the corners and edges..

Mapei keraquick is a good adhesive for this job...

[jon moore]

thanks dave were is the best place to buy these 6mm boards from and also if i was to use ply what is the smallest thickness i could use

thanks for your help

[smurf21]

18mm ply min recommended but a 6mm backer board ie NO MORE PLY is strength equvilent,
http://www.nomoreply.net/overview.htm