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How much cement do I need for a patio?
I'm laying a patio with 600x600 slabs over a mortar bed. How do I calculate how much sand and cement I need for a roughly 20 square metre area?
Expert Trade Answers
"From experience if you get fifteen bags you won’t be far wrong especially if you use a 50mm bed"
Answered on 22nd Apr 2026 - Member since May 2019 -
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"How Carol, if the mortar bed is 50mm depth. This is the equivalent to 1.6 tonne of sharp sand. If you use a 5:1 ratio of sand and cement then you will need 8 bags of 25kg cement. All the best."
Answered on 22nd Apr 2026 - Member since Nov 2023 -
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