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Hi Lloyd. While the mix ratios are important for strength, so is the quality of the sand, aggregate and cement. Dirty sand, weak aggregate and low quality cement will all weaken a mix. The quanti...

(read full answer)It would be interesting to hear whether you were able to find a solution. Worth remembering that any water that comes out of the septic tank will be highly polluted so if it does not soak away prop...

(read full answer)Hi Tim, can you give a bit more detail on the water supply and sanitation system serving the 75 houses, so for instance do they have indoor water connections with flush toilets all connected to the...

(read full answer)Hi Lloyd. Most mixes in the books have twice the amount of aggregate as sand. Peter Stern in Field Engineering gives 326 kg of cement for 1m3 of 1:2:4 mix and 536 kg for 1m3 of 1:1:2 mix, so for...

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