Flagstone mortar quantities question

by Jim Laurent
(Fairfax VA)

David and Hans,

I'm using your video as a guide for my 500 sq ft. patio project but I'm concerned about the amount of cement and sand required. By my calculations, 1 cubic yard of sand = 27 sq feet which would cover 100 sq feet of patio to a depth of 3.24 inches (not even counting the cement and water). This seems like an excessive amount and I don't want to be left with a ton of sand and a bunch of cement bags in the back yard. Can you confirm that it really takes 5 bags of cement and 1 yard of sand for 100 sq ft of mortar? Please explain.

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