|Firewood Chart A: Sorted by BTU Content
|Firewood Chart B: Sorted Alphabetically|
A Correction from Wyoming
Just a comment on your BTU chart. A cord of wood is 4X4X8 SOLID! (as in stacked lumber) so when you deducted the "air space" it was an error. However... you did use the same formula for all species, so the BTU content in relation to each other is still accurate, even though the number isn't accurate for a cord. I did like the fact that you put weights on the list also. Guys are constantly telling me they can get 1 1/2 cords on a pick-up. Didn't think they were... looking at these weights, now I'm sure. Thanks for the info.
I'll admit that a tight stack of dimensional lumber will have very little airspace, but dimensional lumber is sold by the board/foot, not the cord. Our charts are concerned with fuel wood, which is irregular-shaped rounds and splits off the tree. For the record, the correction for airspace between pieces didn't originate with us, it is a widely held standard in the hearth product and solid fuel industries, and we consider it pretty accurate.
Just for grins, let's consider the price you'd pay for a "cord" of dimensional lumber. If you put together a 4' wide x 4' tall stack of 8' long Doug Fir 4x4's, it would take 188 of them (considering actual size, 3-1/2" x 3-1/2"), which would run you over $1,700.00 at the lumber yard at today's price. Seems a little steep for a cord of firewood, no?
A Correction from Plymouth, Minnesota
I need to address your silly comment about the airspace in a cord of
wood. Back in the day, a cord of wood was 4x4x8 as it is today. However,
it was made up of unsplit logs in 8ft lengths stacked 4ft high and 4ft wide.
Logs then were commonly 2ft in diameter or much larger. Therefore, a cord
could easily be comprised of four 24" logs stacked two each high and two each
Ah, the eternal question: when does wood become cordwood? A tree goes through several steps on its way to your wood stove or fireplace. At the very minimum, it must be cut down, limbed, and finally, cut to the appropriate length for its final use. That use could be telephone poles, or dimensional lumber, or log houses, or particle board, all of which might require different lengths. When we refer to "cordwood" in the charts above, we're talking about logs that are cut & split into pieces small enough to fit into your firebox. Here in Washington State, it isn't even LEGAL to advertise wood as "cordwood" unless it is cut in 16" lengths.
Nonetheless, your "Bruce Cord" intrigued us, so we did a little research. Here's what we found:
|According to a 2011 report by the State of Minnesota, the most popular fuelwood species in your state are Oak & Ash.|
|With that in mind, let's examine the "Bruce Cord", comprised of four 8' long by 24" diameter Oak or Ash logs.|
|These logs would be green, as it would take many, many years to season an 8' length.|
|Which means, according to the Engineer's Toolbox, each of your 8' x 24" logs would weigh about 1,200 pounds!|
|To get that load delivered, you'd need to contract with a logging company to make delivery with a log truck.|
|We maintain that, even though your intention might be to cut and split that truckload into fuel-size pieces, you'd be buying logs, not cordwood.|
10/15/15: Log delivery by the cord a reality in Wisconsin!
In northern Wisconsin we buy firewood in log form by the cord. You order however many cords you want from the logging company, they deliver it on a log truck and you cut it up, split it and season it yourself. But it isn't in 8' lengths: the logs are just pulpwood that isn't going to make it to the mill, and 102 inches (8ft. 6") is the standard length that paper mills require.
chart was interesting, thanks.
10/29/15: The Bruce Cord has airspace too
While your answer to Bruce is more than adequate, you might add that the "Bruce Cord" is only 78.54% wood!
David Little, Kansas City, Missouri
Thanks for the chart, very helpful, love the joke at the end