Dark patches on limestone patio - Dark patches on limestone patio

Patio flagstones (slabs), concrete flags, stone flags including yorkstone and imported flagstones.
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A Brew
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Joined: Sun Jun 26, 2016 4:05 pm
Location: Leicestershire

Post: # 109692Post A Brew

Hi
Last week I had a limestone patio laid (Finished on Friday). Today is the first day that it has been dry since completion and we have just discovered some strange dark patches on the flagstones around some of the edges. I was wondering if this is normal for limestone as it looks odd. Could it be the stone is not totally dry due to the rain we had yesterday or could it be staining from the joint compound used? I first thought it was just natural colouring in the stone but where one stone has a mark the one next to it has one that matches? See link below for pictures.

Thanks Andy

http://i38.photobucket.com/albums....k1v.jpg
Andy Brewin
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Tony McC
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Joined: Mon Jul 05, 2004 7:27 pm
Location: Warrington, People's Republic of South Lancashire
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Post: # 109699Post Tony McC

What was used for the jointing?

Loks as though it's oil staining caused by applying a brush-in resinous mortar to dry flagstones and only along the joints.
Site Agent - Pavingexpert
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