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Crack in Grout Around Window Sill

Posted: Mon Jul 06, 2009 1:53 pm
by raymitchell
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?

Kind regards

Ray

Posted: Tue Jul 07, 2009 12:24 am
by plumbbob
You can't use grout for gaps that will either move or expand at different rates. uPVC does both - flexes and expands more than tiles. The gap should be filled with a bead of white silicone.

Posted: Wed Jul 08, 2009 12:12 pm
by raymitchell
We have a large grouted border around the kitchen window sill tiles of about 2 cms. The rest of the window sill is fine apart from a two inch section. :(

Posted: Wed Jul 08, 2009 9:23 pm
by rosebery
Bob is right. I thinkyou should do as he suggests or sooner or later it will become biger than a 2" problem.

Cheers

Posted: Sat Aug 22, 2009 5:32 pm
by www.tileexperience.co.uk
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.