What granite hearth adhesive?

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I’ve laid a new concrete base ready to lay a granite hearth but what adhesive should I use?

The open fire will be used on occasions and then only for a few hours like at Christmas. So do I need to use a specialist product from the likes of Vitcas or can I use a normal cement based floor tile adhesive from Mapei.

Could I use a very sloppy sand and cement mix say 4 or 5:1?

Richard.
 
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sand cement , bed it on cement blobs rather than a full bed but not too sloppy.
i’d add some sbr too to give it some adhesion.
 
Thanks for that. I thought it was important to get a full bed to prevent cracking. I don’t want a thick bed as the additional height will show the concrete sub-base when the carpet is laid.

Is SBR the same as plastiser? Can’t see anyone sellling less than 5L for £20.

Richard
 
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