log weight per thousand

[postville]

Anyone have a chart for green log weight per thousand by species? Bob

[Chuck White]

There's a chart in the Forestry Forum tool box that should work for you.

[MDLogging]

Almost all timber here is sold by weight.  14 pounds per foot for hardwood, and 12 pounds for pine.

[DouginUtah]

Green and dry weights...

http://forestry.usu.edu/htm/forest-products/wood-heating/

[DouginUtah]

Oops, I just noticed Postville asked per thousand not per cord.

What is the conversion factor?

[postville]

Somehow the figures don't seem right, for basswood- 3500#  for 1MBF of lumber and 7200# for 2 cords of logs. Am I wrong figuring 2 cords per thousand?

[beenthere]

Log weight is one thing, but log weight per thousand board feet is really a very crude and rough measurement as there are so many variables that can enter into the estimate.
Best if one tries to identify just what the variables are, and then if buying logs on weight, getting the log scale of those logs. Repeat this enough times to get an average, albeit the standard deviation will likely be large with few samples.

And as postville noticed, somehow the figures don't seem right when translating back and forth with cords, log scale, and weights. Toss cubic measure in there to add more fun.

[Jeff]

https://forestryforum.com/board/index.php?action=logweight

This is the disclaimer we use on the weight calcs in the tool box.

 
     This calculator is useful in providing approximate weights for species, but the user should be careful in how the product is used. Wood varies considerably in weight per constant volume (density) on a regional level and at the local level. That is, the weight of a piece of wood from one area or tree will differ from the same species in the another area. The growth rate is the most significant factor in determining density, with slower growing trees having a higher density (therefore greater weight), than faster growing trees. This is due to the late wood cells (the dark ring seen when a tree is cut) having thicker walls and being closer together than the early wood (lighter wood between the rings).

     Where the board is cut from the tree is another factor, the heartwood portion of the tree (the center portion, often characterized by a change in colour) is composed of dead cells and will be lighter than the sap wood, where the cells are still living. Wood that is cut from the portion of the stem that still has live branches on it will be lighter due to hormones produced by the foliage.

     In different areas, genetics will play a factor in wood density, along with the growing site (moisture and nutrient characteristics of the soil). Where the tree grows on the hillside, eg south facing versus north facing slope, high elevation versus low elevation, areas of heavy snowpack versus light snowpack, constant winds versus sheltered locations all have an influence on the density of wood.

[wwsjr]

All the logs I buy are by the ton, no scaling, trucker brings scale tickets to get his money.
I cut about 125 ton of cypress last year. I kept fairly accurate records, may have missed a few logs, and it took 7.5 to 8 ton for 1000BF of lumber. Green cypress is heavy because of moisture. Sometimes water would drip out while sawing. I think green SYP is close to the same yield per ton. Based on 8 tons, I paid an average of about $360 per thousand for the logs, price varied throughout the year.

[bill m]

1000 lbs difference in a thousand board feet could be a lot of lumber. As Jeff said different growth rates/densities can have a big effect on log weight. When I am cutting big white pine one of the first things I do after limbing is check the size of the rings. If they are to tight I know I could have a problem picking up 16 footers with my trailer.

 

[Coon]

bill m, that sure is a dandy of a log there.  ;)  I got a bunch of big spruce like that you could come haul out of the bush for me.   ;D

[kelLOGg]

https://forestryforum.com/board/index.php?action=logweight

This is the disclaimer we use on the weight calcs in the tool box.

Jeff,
Other than clicking on the link in Postville's topic, I can't find the Toolbox on the FF web page. Where is it?
Bob

[Norm]

Lower left hand under the sponsors list. Red toolbox icon.