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Posted: Sun May 18, 2008 1:31 pm
by lutonlagerlout
where do you get 1.5 m3 from?
the dimensions you gave us you need .5m3 tops =1 tonne of ballast plus 5 bags OPC
LLL
Posted: Sun May 18, 2008 3:39 pm
by Probs
The footings I quoted were just for one part. Adding all the seperate bits together gives me the total I mentioned above.
Sorry for the confusion.
Posted: Sun May 18, 2008 10:15 pm
by lutonlagerlout
cool estimating materials correctly is important,my blokes just screeded a floor of 65m2, at 90 mm thick i estimated this to be 12 tonnes of grit sand and 60 opc. we had about 1.5 tonnes left over and 7 bags of dust
another builder wanted the guy to get 30 m3 of readymix screed delivered,thats over 60 tonne
can you imagine how bad that would have gone?
LLL 
Posted: Mon May 19, 2008 8:43 am
by Rich H
A common mistake for DIYers is to assume that a 'tonne' bag and a loose tonne are the same thing. A tonne bag is rarely greater than 875kg whereas '5t' delivered loose can easily be 5.5t. Yard boys will often put a bit more in the skid bucket than is strictly necessary.
Posted: Mon May 19, 2008 8:50 pm
by Mikey_C
I've got 5T of ballast left over to prove it. Got fed up with ordering two/three/four bags at at time, ordered 7T for the same price as three bags, they delivered nearly 8 and due to my over esitmateing got left with 5T left over.