Grout Trouble!!!!

[alastair68]

I finished tiling a large bathroom last week.I have been called back as there is some discolouration in the grout in a few areas.It has happened on three of the four walls and it affects about two tiles next to each other.These tiles are all the cuts up to the ceiling and the discolouration is on the three sides of each tile.Could it be contamination from my wet cutter as i used off cuts in places!

[Dave]

it could be if the tile body was still damp..rake the grout out and re-grout..and wait to see if it re-appears....dave...

[Fred]

By any chance, if you remember, did you mix new grout up at those spots? Some grout makes are renowned for mixes exactly water/grout every time. If not, this can happen.

[alastair68]

I ruled out the grout because i did it over two days.it has done it on each batch i made up.
the damp is a possibility it would explain why the grout around that tile only is affected.
i will rake out and regrout.
many thanks

[Fred]

Could be new plaster if it was tiled too soon.