Several weeks ago a crack two inches long formed in the grout on part of my windowsill. I removed the existing grout and applied new grout but it keeps on forming a crack in the same place. As the grout is near the edge and fixed to the PVC window frame I think that the PVC frame is moving when the weather is hot and the crack is forming. Does anyone know how to stop this happening?
hi new to this site, but not to tiles.
i think you are lucky a crack hasn't appeard before now. i agree with the others and suggest a bead of silicone.
there are flexible grouts you could use if you really want, but you may have to add additional flexible additive and there still wouldn't be a guarantee.