hi all....

[Andy Stile]

First of all i'd like to say hi to everyone, read a lot of posts on this site and it gives a lot of valuable information... First post this so go easy but can anyone give me any clues about what I've done wrong here.... I tiled a kitchen floor about four years ago and I've just bumped into the customer, he's informed me that every other row of tiles on his floor has a very slight crack across it, now these are black galaxy tiles with underfloor heating, the subfloor is ashphalt on concrete but I stuck no more ply boards down with webber spf and also used the same spf to tile the floor, and a flexible grout to finish... its only a galley kitchen around 2m wide by 3m long so didn't think an expansion joint was needed...Where did I go wrong????

 

[Qwerty]

Welcome. Sounds like a resin type tile that has warped with the UFH

 

[White Room]

Do the cracks correspond with the joints of the no more ply....

 

[DHTiling]

Why no more ply ? And what prep did you give the asphalt ?

 

[Time's Ran Out]

Sounds like the no more ply hasn't been taped and jointed - what size sheets/what size tile?
Black galaxy is granite so very hard and not resin so sub tile prep is the likely culprit!

And welcome!