What to lay before tiles?

[bluegazza]

Hi, I am new to tiling and about to embark on our first serious attempt at a bathroom.

My question (which I am sure has been asked lots before!) is this!

The existing bathroom had a carpetted floor which i have taken up which leaves chipboard flooring. What is the best thing to do with this before tiling?

Is it to remove the chipboard and put down plywood? If so, what thickness? I would prefer not to put down 18mm as this may make it to high! Is there a particular type of ply to use ie)marine

Or can I put down concrete board? If so does this go on to the chipboard?

Many thanks in anticpation of someone helping!

Gary

[Ceramico tiling]

I would prob put hardy backer board on floorboards if there is no deflection in the floor,,and if you use ply it can be no less than 15mm and requires correct priming before tiling.Chipboard is useless to tile on.Just hang around and I am sure these guys will give you very accurate info

[Scott]

As Russ says 15mm minimum for over laying. In an ideal world taking up the chipboard would be the way to go and replace with ply and add extra noggins to the joists if its needed to remove any 'bounce' from the existing floor. However in the real world its not always possible to remove it completely as it does tend to run under stud walls to other rooms.

[Yorkshire Tiling Services]

Hardie backer cemented & screwed down would be good, as long as there is no bounce on floor.
If this is floating floor, then consider something other than tiles, likely to crack

[merlecollins]

Is this a repeat thread??

What to put down before laying floor tiles

[paul flight]

if you are ripping out the bathroom the that that chipboard up and replace with W.P.B. 18mm ply . make sure the you put more noggins in between the joists If to have two bits of ply that join then brace under both edges that meet, screw down at every 20cm along the joists and bracings where boards meet !!! make sure you do not hit any pipe work or electrics!!!!! when screwing the ply down. bye some flexi decoupling matting ( only 3mm thickness. ) also some rapid set flexib grey adhesive to stick the matting to the ply. use small notch trowel. prime ply with tile primer ( not use PVA) stick down the matting. then tile next day. matting will help with any vibration . you must fix tiles with a flexi adhesive and use flexi grout. this will only work if the joists a stable / strong and there is not excessive movement in them. this way you only increase the height by 3mm + adhesive+ tile.

[Ceramico tiling]

if you are ripping out the bathroom the that that chipboard up and replace with W.P.B. 18mm ply . make sure the you put more noggins in between the joists If to have two bits of ply that join then brace under both edges that meet, screw down at every 20cm along the joists and bracings where boards meet !!! make sure you do not hit any pipe work or electrics!!!!! when screwing the ply down. bye some flexi decoupling matting ( only 3mm thickness. ) also some rapid set flexib grey adhesive to stick the matting to the ply. use small notch trowel. prime ply with tile primer ( not use PVA) stick down the matting. then tile next day. matting will help with any vibration . you must fix tiles with a flexi adhesive and use flexi grout. this will only work if the joists a stable / strong and there is not excessive movement in them. this way you only increase the height by 3mm + adhesive+ tile.

what do you mean by bracing?

[paul flight]

where two bits of ply meet then put a noggin in between the joists at the point.so that both edges of the ply sit on and are screwed to the noggin..