hair line cracks on wall tiles

[The Legend; Phil Hobson RIP]

but would crazing follow the tiles right across a few in a line which he said,which would prob be slight movement causing the crazing phil?

Good point, not a normal characteristic in crazing.

 

[AliGage]

Can you tell us exactly what the tiles are and where they came from please?
Are these cracks running through the body of the tile or is it just the glaze of the tile cracking?

Had my local topps come to me with a similar question late last year, they supplied a cheapish, glazed ceramic wall tile to someone and it looked like they were all cracking. It was a faulty batch of tiles.

So don't be too hasty in ripping them off and starting again just yet.

 

[DHTiling]

A lot of glazed tiles are prone to glaze crazing, this would not normally show up with a white grout but would with a grey etc..

Stress crack would normally effect the tile biscuit as well but as phil said sometimes on cheap glazed tiles the rapid setting and shrinkage of adhesive can craze a thinner tiles finish without cracking the biscuit and transfer through more than one tile in a line..

Sometimes these glaze cracks are already there from the firing process , so don't right off your tiling and just replace ones that are effected..