cracked tiles on ply.

[freewilly]

hi, Can someone tell me why tiles would have cracked along the join lines of the overlaid ply.The ply was screwed down as it should have been.cheers. Tom

 

[dextrous]

how thick was the ply?

what spacing between the screws?

 

[freewilly]

how thick was the ply?

what spacing between the screws?

Hi.Ply was 5/8th and it was screwed every 6 inch?

 

[dextrous]

Just read the word "overlaid ply". To be honest, don't know why it's flexed enough to crack the tiles - hope someone else works it out, 'cos I'm interested too!

 

[IJWS15]

I would guess it is the floor moving under the ply - what type of floor is it?

 

[Richard C]

Joist spacing, size & span of joists, type of existing floor? Type/make of adhesive & grout used? If the floor flexes, it will crack up. Over boarding can also give problems if you don’t fix it down correctly; support along the joints, screwing into the joists not just into the top of the floorboards; personally I always prefer to replace rather than overboard as it can often lead to disappointment.

Are you really in Bahrain? Local factors could have some significance!