uneven bathroom floor

[Ricky H]

hi all first job first problem
im going to be tiling my bathroom floor the floor is uneven got a 10-15mm run in places the floor is chipboard.
if i use a self leveling compound can i tile straight on to it? or should i ply the chipboard first then self level all replies appreciated

 

[Ricky H]

the point off the question is, if i self level the floor do i still need to ply?

 

[bigandy]

you will struggle to get a self leveler that you can put down that thickly.i am not sure of other brand names but know bal do a pourable thick set(not sure what correct name is,someone will shout up).
re ply i would say yes put it down first due to all the problems associated with chipboard. you could also use hardibacker or no more ply

 

[div]

ply it out mate screw down...sometimes the screws eat into the chipboard so have some ring nails handy 2

 

[Ricky H]

thanks for replies having checked the floor again theres not that much of a run through the room 1-2 mm, it's the bit of floor under the window, from the window wall to about 10 inch in theres a 6mm run then rest of rooms not to bad

 

[doug boardley]

still ply it Ricky, if necessary fill out the run out with flexi slc

 

[Ricky H]

cheers doug going to use 12mm ply the tiles r 330x330 ceramic? the run goes into the room the high point is at the wall

 

[tilum]

ricky says 12mm ply, would 9mm ply be ok to save taking the floor too high, i'm only asking because i am doing a similar job at my mates house.
cheers to you all.

 

[AllurePTS]

9mm ply is unlikely to be any good mate ....be careful with your slc ....there are many different characteristics with different brands and some say you can pour up to 8mm , however - the thicker it is the more likely it will crack so IMO - I would suggest with all of them it is safest to build it up in thin layers (up to 4mm) rather than thicker ones. Read the instructions carefully and prime/bond as recommended (with sbr and the like) do NOT use PVA !!!

 

[bigandy]

there are several self levelers out there now that can be poured up to 50mm in one application.the one i know off is granfix's but am sure most addy companies do there own variant