Mike G wrote:5x2.5 = 12.5sq.m
12.5 x 0.06= 3/4 cubic metre.
From here: http://www.diydoctor.org.uk/tips/tipsconversions.htm there are 1.92 tonnes per cubic metre of Type 1, so:
.75 x 1.92 = 1.44 tonnes. So, on the face of it, two bags (1.6 tonnes notional) should be enough.
Can I just double check that this is the amount required to get a compacted base? In other words I assume 1.92 tonnes would fill more than 1 cubic metre as delivered, but would then lose volume as compacted.
The drive I need to repair averages 2.5m wide and is about 50m long, with a suggested depth of sub base of 100mm after compaction that is a volume requirement of 12.5m3, so that would suggest I need 24 tonnes of sub base. If a standard bag is 0.8 tonnes that would be 30 bags.
Does all of that make sense? Given the amounts involved I don't want to get the decimal place wrong in my calculations!
Terry.