PATIO MORTAR MIX

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hey guys i am laying a patio and the ground is a bit uneven but need to set the slabs in about 2" of mortar, im laying about 20m can someone help me with the ammount of sand and cement i need to order and also what ratio should the mix be i have been told i can mix 10-1 is this right seems a bit weak to me
thanks
Bill
 
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blimey nobody knows, did i post it in the wrong section?
 
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just another question why grit sand is there any reason to use this other than building sand, also not sure if this is relevant but i am laying the slabs with a wet mix not a dry bed does this amke a difference
thanks appreciate your help
 
building sand at that depth is very weak when set because the grains are so small. It also (because it holds so much water) turns very soup like when you try to tap a flag down into it.

Use grit sand with a good dose of plasticiser.

Tony who owns paving expert wrote that about 10:1 and whilst he has forgotten more about paving than most will ever learn I imagine there are few professionals use it anymore.

For the extra 20 quid of cement required it is not worth the risk.
 

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