What mortar mix for a fireplace

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Replacing our fireplace with a Victorian cast iron type. The front hearth will be a granite slab but not under the fire grate. This will be cemented, but what mortar mix should I be using?

Richard
 
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Just a sharp or building sand and cement mix, it’s not directly in contact with the fire and sits below it assuming you’re having the usual fire insert and ash pan
 
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Just under 6-1 with a splash of ad mix. Would not go under 5-1.
Will give a bit and plenty strong enough and keep sand colour. 4-1 will be gray
 
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