sub-floor lip

[Stef]

Depends on what size trowel?
I wouldn't bother about 1mm, tiled to a lot worse than that.

 

[Mr Tiler]

30mm centres?? You would use a box of 500 screws for one sheet!!

yeh is that not b.s? or is it the other b.s? lol

 

[Mr Tiler]

the floor I done recently fixed down ply at 20mm centres took me all bluddy day! think I used around 250-300 screws cant remember exact

 

[Stef]

the floor I done recently fixed down ply at 20mm centres took me all bluddy day! think I used around 250-300 screws cant remember exact

150mm centres is more than adequate.
At 30mm centres you would use 3240 screws,a bit much if my calculations are correct.

 

[beanz]

20mm or 200mm? 20mm centres would be a LOT more than 200 screws lol!

 

[Mr Tiler]

7.5m2 room overboarded and screws went down at 20cm/200mm centres drew the centres on boards and away I went had to wait ages cuz my crappy drill kept going flat.... I have been told in the past on this site that when boarding up 30mm is standard. I purchased 300 screws and there where about 15-20 left in the box

 

[Guitardedleon]

Depends on what size trowel?
I wouldn't bother about 1mm, tiled to a lot worse than that.

say for a pretty standard 300x300 ceramic floor tile - what trowel would you use (over ply+ditra)?
the ditra is only 50 quid so for the sake of say £70 and an hours work Id rather use it anyway.

regarding screws.. i used around 170 :lol:

 

[Stef]

say for a pretty standard 300x300 ceramic floor tile - what trowel would you use (over ply+ditra)?
the ditra is only 50 quid so for the sake of say £70 and an hours work Id rather use it anyway.

regarding screws.. i used around 170 :lol:

I think? Ditra goes down with a 4/6mm trowel,
I would just overboard with 6mm Hardie on top of the ply.
If its only ceramic I wouldn't bother with Ditra but if your getting it at a decent price then go for it, it won't do any harm.

 

[Guitardedleon]

sorry for yet more questions..

with hardiebacker do I need to tape/fill/anything where the ply joins, before spreading addy for the backer?

 

[Stef]

I never do, just stick the Hardie down, glued & screwed.

 

[beanz]

I've used a 6mm trowel once with Ditra.. Never again! Way too much adhesive under it. I use a 3mm trowel now, and it goes down really nicely. 10mm on top.

 

[beanz]

sorry for yet more questions..

with hardiebacker do I need to tape/fill/anything where the ply joins, before spreading addy for the backer?

There should really be Silicon filled expansion gaps between the sheets of Ply.

 

[Guitardedleon]

sorted the floor out this morning!
flat as a card now. zero lip anywhere! :hurray:

thanks again all - massive help!

 

[Dan]

Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.