Tiles Cracked in New Extension - Help Please !

[DAK]

Sorry for your problems. Tiles that cost £11.00 a box should be an indication of quality.B/Q probably have 100% mark up do the maths. You should use Porcelain, that can be around £20.oo mt

Thanks Simon - understood. Does this also account for the grout cracking?

 

[Simon Dale]

Thats a different issue, things have moved IMO a lot

 

[Julian 'Farmer' Bonsall]

Understanding the deflection is important. The L/360 comes from 24" centre floors (I think) but L/720 is what I used for firming up my floors. If your span is 4m then thats either 11mm deflection or 5.5mm. I couldnt see the grout cracks in the photos.

 

[Spare Tool]

If you heat and cool wood it WILL move no question..

 

[Simon Dale]

Understanding the deflection is important. The L/360 comes from 24" centre floors (I think) but L/720 is what I used for firming up my floors. If your span is 4m then thats either 11mm deflection or 5.5mm. I couldnt see the grout cracks in the photos.

There is no grout as its moved so much. Look at first picture 🙂

 

[DAK]

There is no grout as its moved so much. Look at first picture 🙂

I think this picture is probably from a tile that was taken out to check underneath - hence the lack of grout. The second picture is more accurate - apologies if misleading. Was sent these pictures - I'm out at the moment.

 

[Julian 'Farmer' Bonsall]

I can see the grout cracks - zig zag from tile end to tile end. How much movement do you have?

 

[Time's Ran Out]

The issue you have here is the tiles!
Ceramic tiles are not suitable for this floor construction and your tiler should have made you aware of that!
As per @Tom Astley if they are indeed BCT (as I assumed ) then it’s just another case of materials being not fit for purpose.
A porcelain tile may have given you a better job but only a time served professional would understand the substrate preparation suitability.
There is a thread on here regarding BCT tiles do add your comments.

 

[Julian 'Farmer' Bonsall]

The grout has also failed on the opposite rows to the tiles. Would this not suggest the floor has excess movement?

 

[Ajax123]

120cm apart cracks suggests along the joints in chipboard rather than joists which would be maximum 60cm apart but mior like 40.