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Crack in Grout Around Window Sill

Postby raymitchell » Mon Jul 06, 2009 12:53 pm

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

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Simply Build It

Postby plumbbob » Mon Jul 06, 2009 11:24 pm

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.
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Postby raymitchell » Wed Jul 08, 2009 11:12 am

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. :(
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Postby rosebery » Wed Jul 08, 2009 8:23 pm

Bob is right. I thinkyou should do as he suggests or sooner or later it will become biger than a 2" problem.

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Postby » Sat Aug 22, 2009 4:32 pm

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.
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