June 4, 20179 yr I'm constructing a lean-to extension that will cover about 13.5 square meters to my existing kitchen/diner. The total length of the foundation, allowing for a 100 mm shoulder, is about 9.5 meters. I'm looking at about 2.75 cubic meters of concrete. (9.5 X 0.65 X 0.25m) I looked up a concrete mix on the internet and the suggestion was: 1 part cement 2 parts sharp sand 4 parts gravel. Does this sound right? I had other ratios result from my search as well! My builder's merchant also sells a mix of sand and gravel. This sounds like an easier option than separate deliveries of sand and gravel? I hope to mix and lay this in one day, with two of us working. Does this sound achievable?
June 4, 20179 yr Ballast would be easier but I don't know how it compares price wise to getting the parts individually. I personally would get ballast if I was mixing myself
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