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  David Cox July 23, 2012 at 1:41pm

  You could work it out how ever you would normally work it out - and then divide it by the Meterage that they would like the quote for? that would at least protect you from accidentally under charging in a way your not used to.
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  Pip Howard July 23, 2012 at 6:19pm

  The problem for me is always that although easy to divide a cubic metre against meterage, it is the difference between a tonne and a m3. I always go with a conversion of 1.45 for soil, leaving enough of a margin of error for safety, but if high percentage of sand could be as much as 1.55

  Therefore for 150mm depth: 145 /2 = 72.5 + 145 = 217.50.  1450 / 217.5 =  6.6m2 per tonne.

  
  
  David Cox said:

  You could work it out how ever you would normally work it out - and then divide it by the Meterage that they would like the quote for? that would at least protect you from accidentally under charging in a way your not used to.
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  Kieran Ray July 23, 2012 at 7:18pm

  A cubic meter will spread over 7.5m2 if you are laying at 150mm so work that out then order it by the cubic meter. The supplier may get the arse a little but then its on their shoulders if its wrong.
  
  Or do as Pip says and workout the bulking factor per material. I think for mulch it is 1.8 instead of 1.45, but then again if its warm and dry for a while the mulch can weigh even less.
• PRO

  Gary RK July 23, 2012 at 7:25pm

  You'll find the attached useful, it has 'factors' detailed within. I use it in pricing contracts.

  1 cu.mtr	(1.6 tonne)
  ¾ cu.mtr	(1.2 tonne)
  ½ cu.mtr	(0.8 tonne)
  ¼ cu.mtr	(0.4 tonne)
  1 tonne	(0.6 cu.mtr)
  ¾ tonne	(0.45 cu.mtr)
  ½ tonne	(0.3 cu.mtr)
  ¼ tonne	(0.15 cu.mtr)
• PRO

  Gary RK July 23, 2012 at 7:46pm

  Sorry meant to say, above for soil and fine aggs (ie sand) as a general guide
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  paul mcdermott July 23, 2012 at 9:40pm

  Thanks again for all the help chaps(particularly nice,if a little disconcerting, of the late great Mr James to show an interest!) will pass all the info on to our contract manager as the specs also require depths of 100,125,150 and 2oomm, along with a pack of extra strength Ibrufen!