Fitting plywood prior to tiling bathroom floor

fman02 · Post by **fman02** » Sun Nov 22, 2009 1:34 pm

Attempting my first tiling project and having trouble getting screw heads flush with ply that I have laid prior to tiling.

Is there a specific type of screw I need to use to get them flush (using countersunk zinc plated). Presumably I am right in trying to screw ply to joists at 200mm intervals?

Thanks

Fman

Simon Site Manager · Post by **Simon Site Manager** » Sun Nov 22, 2009 4:13 pm

Hi Fman,

You need to take up each screw and countersink the hole, this could be done with either a countersink bit of a lrge drill bit (larger than the head of the screw.

The screw centres are good at 200mm, make sure you nog any joints of the ply.

S

fman02 · Post by **fman02** » Sun Nov 22, 2009 5:38 pm

Thanks Simon.

Forgot to say that it is ply that is being laid over chipboard floor. When my other bathroom was completely refitted the guys who did that one just tiled straight over the chipboard - no issues 4 years on but all the advice , inlcuding that from a frierd in the building trade, says lay ply (or cement board ). Problem is that I can't then nog unless the chipoard joints are nogged?

Simon Site Manager · Post by **Simon Site Manager** » Sun Nov 22, 2009 6:26 pm

Hi Fman,

Chances are the chipboard joints won't be nogged (this NHBC rule has only just come out). As there is a sub floor, you won't need noggins anyway!

I have just (today) tiled over 22mm chipboard. I have done many projects were we just go over 22mm chipboard.

Simon

jozeffo · Post by **jozeffo** » Tue Nov 24, 2009 11:39 pm

I used to follow the rules and use 12mm ply screwed to the boards and boards screwed to the joists but as long as it is sound, the DIY tile on wood floors stuff seems to allow all manner of laziness. I have seen two guys laying tiles on floorboards with 4mm hardboard across and they claimed they did it all the time!

Unfortunately, it has a 48 hour drying time which can be a pain.

lamntile · Post by **lamntile** » Fri Dec 11, 2009 10:39 pm

I have never and will never tile directly onto a chiboard floor no matter how stable it is , having had to remove tiles directly onto chipboard and then replace the floor due to rock hard adhesive on to it or huge gouges out of the board,

IF the floor is a solid and stable chipboard i will put 8mm ply down to lay the tiles on