Mortar for patio

24 Jun 2014
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United Kingdom

I'm planning a project to lay a few patio slabs on an existing concrete base in the garden. The base is level and intact (left over from an old garage).

Question is how do I go about binding the slabs to the base? Was planning a sand cement mix of 6:1 but unsure whether I need to add any water or not. I've read the moisture in the air should do the trick, but wasn't sure if a bit of extra water would help given I'm laying onto a concrete base?

Advice or tips appreciated.
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Use sharp or washed sand, its gives better suction for holding/grabbing the slabs. Personally Id do either a semi dry or wet mix, so you know when its gone off
Use a slurry of sand and cement on the concrete, and on the backs of the slabs.
Use a 3:1 mix of any sand available or handy.
For a few slabs: semi-dry or wet, it wont make any difference.

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