I am to lay some dark gray 100mm square cobbles that are on a roll in the garden which firstly means the gaps between them are quite wide and secondly will need to be grouted with something also in a darkish gray. Can anyone recommend where to get something appropriate? I have previously used some dark gray grouting for internal tiles but not sure if this would be appropriate for this outside job.
Coloured grout
Nov 04, 2005
2 Replies
Cement based grouts are suitable for exterior use. If you have doubts call the technical helpline. Probably you will be suggested a pointing mortar, which is designed for wider joints, typically up to 20mm.
John Schmitt
Personally I would use Ardex-Flex-FL grout. This is cement based, available in grey and is suitable for external locations and standing water if drainage is less than perfect.
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alternative is Ardurit GK (probably with Ardion 101 admix for additional water proofing)
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the data sheets and see which is best for your specific application, as only you know all the details.
Christian.
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