Firewood Maths Problem

[Ians762]

Hello everyone,

 

I am looking at the possibility of selling firewood as a business. I have hit a bit of a problem with the maths involved and wonder if anyone here can help:

 

When I buy 1 tonne of green firewood from the road side, after processing how many m3 bags would it fill.

 

I understand that there is different weight to volume ratios depending on species, but if you assume 1 tonne for 1 m3 green timber, what are you lot getting after it has been processed?

 

Thanks in advance!

[windfall]

1 tonne is just under two loose cubes.

 

For projections and stock estimations i use 1 tonne = 2 cube.

[mendiplogs]

Hello everyone,

 

I am looking at the possibility of selling firewood as a business. I have hit a bit of a problem with the maths involved and wonder if anyone here can help:

 

When I buy 1 tonne of green firewood from the road side, after processing how many m3 bags would it fill.

 

I understand that there is different weight to volume ratios depending on species, but if you assume 1 tonne for 1 m3 green timber, what are you lot getting after it has been processed?

 

Thanks in advance!

HI IAN thats very hard to answer that have a go and find out thanks jon

[gensetsteve]

1 tonne is just under two loose cubes.

 

For projections and stock estimations i use 1 tonne = 2 cube.

 

to get 2 cubic metres the cord must be very dry

[morten]

1 tonne is just under two loose cubes.

 

For projections and stock estimations i use 1 tonne = 2 cube.

 

That would be a good estimate, if the wood wqas sold green, but...

 

1 tonne green wood will become 750 kg dry wood (depending on species and moisture content).

 

750 kg dry wood will (when split) become 1.5 m³ firewood (smaller pieces => larger volume)

[windfall]

why not offer help?

 

What do you find a tonne of cord makes?

Edited July 13, 2012 by skyhuck
Please be civil

[Wallnutt]

1 tonne green wood will become 750 kg dry wood (depending on species and moisture content).

 

750 kg dry wood will (when split) become 1.5 m³ firewood (smaller pieces => larger volume)

 

Sorry to take this off at a slight tangent but if i bought 100 tonnes of wet soft wood left it to dry to give me 30% moisture content and then chipped it for biomass would i get 75 tonnes or 300m3 of chip.

p.s. how long would i have to wait to get to 30% moisture thanks

[harvey b davison]

if it was me, and windfall says 1 ton = just under 2 cube. then i would use a figure of 1.5 cube per ton. This way should ensure you always calculate enough stock.

 

just my thoughts on it.

[oldwoodcutter]

Thats good advice Harvey.

[ThrustSSC]

Windfall is spot on. It's an empirical measure, not an exact science, because:

 

1) MC varies on initial purchase by species, time of year, period since felling, weather since felling, storage since felling, et cetera ad nauseam

2) Wood density varies by species

 

So the best Ians762 is going to get is a rough guide. And 2m3 per ton is a pretty good rough guide in my experience! A load of wet oak will be rather less, a load of dry sycamore rather more. YMMV!