Air Spaces in Stacks

[Dorset Treeman]

I am about to sell my first logs by volume for firewood and fencing materials. I am happy with how to measure the stack when it is roadside to know what the volume is but do I then need to take air spaces into consideration? If so, how is this done?

 

Any help would be appreciated.

[Dorset Treeman]

Being new to the industry, I wondered what sort of figure per m3 or tonne that hardwood is going for roadside for firewood, particularly in the south west - Dorset, Devon, Cornwall, Somerset, Hampshire etc). Anyone willing to give an idea of current prices?

[Brushcutter]

I am about to sell my first logs by volume for firewood and fencing materials. I am happy with how to measure the stack when it is roadside to know what the volume is but do I then need to take air spaces into consideration? If so, how is this done?

 

Any help would be appreciated.

 

You do need to work out air space in the stack. You need to measure a section and count then number of billets and the area taken up by those billets.

Best thing is to get yourself a copy of the blue book. That has how to measure the stacking coefficent.

Treesource Silviculture, Woodland Creation & Management

 

Cost per tonne varies. £30-60 quid a tonne. Really depends on this little equation. standing price(m3)+Felling cost (m3)+extraction cost (m3)+profit = roadside price.

[Dorset Treeman]

Would those knowledgeable in this area think that 30% is a fair amount to allow for air space in a stack of norway spruce such as this?

[openspaceman]

Would those knowledgeable in this area think that 30% is a fair amount to allow for air space in a stack of norway spruce such as this?

 

A stack of perfect cylinders has air spaces of 21.45% so to get logs to stack with 30% they need to be essentially green sawlog grade rather than pulp, also the longer they are the worse so my guess would be that stack is probably more than 30% air.

 

The more serious inaccuracy is likely to be in measuring as it is a long low stack so edge effects are make measuring difficult and bear in mind there is more air space when loaded between bolsters on a lorry.

[combined tree services]

Although I'm sure it's obvious but to be accurate you ideally need neatly stacked timber that is as close to the same length as possible .

[Dorset Treeman]

A stack of perfect cylinders has air spaces of 21.45% so to get logs to stack with 30% they need to be essentially green sawlog grade rather than pulp, also the longer they are the worse so my guess would be that stack is probably more than 30% air.

 

 

 

The more serious inaccuracy is likely to be in measuring as it is a long low stack so edge effects are make measuring difficult and bear in mind there is more air space when loaded between bolsters on a lorry.

 

 

More like 35% do you think.

[Joy Yeomans]

cant see the end of stack very well but looks to be 25-30 tonn there

joy

 

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[muldonach]

Would those knowledgeable in this area think that 30% is a fair amount to allow for air space in a stack of norway spruce such as this?

 

Nowhere near enough:- 45% of that stack is broken stowage (airspace) - big flared butts, bent lengths and some of it with projecting snags.

 

Even trying to estimated the average height of that stack will be a challenge, since it varies quite a bit.

 

Cheers

mac

[Chris Sheppard]

Know it seems to be the old fashioned way of doing it, but it seems a lot less hard work just sending each load out over a weighbridge/using wagons with on board weighers.

 

Those who worry about mc and/or different species affecting weight - simples, vary the price/T to suit

 

To me, volume is too easy to manipulate to suit either party.