hi , i need to concrete a 2.6, x 4.2m floor at 120mm. how many 25kg bags would i need and how many bags of cement would i need , the access is tight.. :rolleyes)
I've never worked out of bags but I think it works out to about 70 bags of sand 25 bags of sand.
I'm sure you know you should do a sub screed at that depth and some insulations don't have enough compressive strength, well officially anyway.
so 95 bags of sand??
Kg of cement Kg of sand Kg of gravel Litres of water You will need approximately..... for C 20 mixture
