Think of the great memories around a fire pit or camp fire. Toasting marshmallows or having your favorite beverage as you watch the flames dance. Firewood also serves as an alternative to heating with gas, oil or electric heat.
Firewood is usually sold by the “cord” which is the measure of a pile of wood equal to 128 cubic feet. However, some cords may have less cubic measure and only be ‘face cords’ with less wood volume.
Firewood logs are often stacked in piles (or racks) that are 4-feet or 8-feet long to aid measurement.
The State of Pennsylvania requires firewood to be sold as a specific volume measured in cubic feet. Since fireplace logs are usually cut to shorter lengths (often 16 to 18-inches long) the volume calculations become a bit more complicated. If you stacked 18-inch long logs in a neat pile 4-feet tall, it would have to be just over 21-feet long to equal a true full measure cord of 128-cubic-feet.
One full cord of neatly stacked firewood is:
4 feet x 4 feet x 8 feet = 128 cubic feet
Wood is often sold by the “face cord” which is a stack of wood 4 feet high and 8 feet long, with logs of varying lengths. The length of the pieces of firewood will determine how much wood is actually contained in the face cord.
If the logs are 24 inches long, a face cord would contain 1/2 full cord.
If the logs are 16 inches long, a face cord would contain 1/3 full cord.
Carrying these calculations a bit further, a full cord of 16-inch length pieces would be a stack 4 feet high x 24 feet long. Air space in most firewood piles (due to the irregularity of logs) can average up to 30% of the total volume.
The volume of this bundle of firewood is labeled 0.75 cubic feet so it would take 171 of these bundles to equal a full cord.
APPROXIMATE HEAT VALUE RANKING FOR COMMON FIREWOOD IN THE NORTHERN U.S. WITH #1 BEING BEST:
1. White Oak
2. Black Locust
3. Shagbark Hickory
4. Sugar Maple
6. Red Oak
7. White Ash
8. Red Maple
9. Black Walnut
10. Black Cherry
Some types of wood are more user-friendly since they’re easier to set on fire and burn much better. Ash is often called the “Firewood of Kings” since it burns well even when freshly cut.
Generally speaking, woods that are high in resin content (pine, spruce, fir) aren’t used in home fireplaces since resulting resin build-up in a chimney can promote chimney fires.
Woods that ‘pop’ and spark are also considered less desirable for burning. No matter what type of wood is burned, it’s important to practice good maintenance by having a chimney periodically inspected and cleaned or “swept.“
Rating the overall quality of firewoods is open to debate, but the categories below should help give you a rough idea of where the various firewoods stand.
Overall Rating / Type of Firewood
EXCELLENT – Ash, beech, hickory, sugar maple, oak
GOOD – Black cherry, black locust, red maple, black walnut
FAIR – Elm, sweet gum, poplar, white pine
POOR – Spruce
Plant photos – Hundreds of photos!