When you stack firewood, do you store it bark-side up or down? It depends, say some experts.
If split wood is stored outdoors, stacking it with the bark side down can allow water to collect in the u-shaped trough. This moisture retention can prolong drying and accelerate decay, says Knaebe. Stacking it outdoors with the bark-side-up, on the other hand, can help protect the pile of wood below from rain and other weather.
Many people store wood in a shed or some other type of shelter. In climates with even moderate precipitation, having a roof over your wood is advantageous.
Whether stacking it inside or out, many people lay a few small logs or lumber on the ground perpendicular to the first row of stacked wood. This allows for better air-flow and reduces the potential for bacterial or fungal infestation due to close proximity to the ground, says Jan Wiedenbeck, Research Forest Products Technologist with the U.S. Forest Service Northern Research Station.
“I also wonder if the bark, when on top, might protect unsheltered wood from long-term photo-degradation?” says Wiedenbeck. “Sunlight can certainly affect checking and splitting in wood, but does it affect Btu’s?”
Knaebe, a wood energy expert, responds that while ultra-violet light can indeed destroy lignin, which has a higher Btu than the rest of wood’s constitutive parts, it wouldn’t be enough to significantly affect actual thermal output.
In the end, an answer to the “bark up or bark down” question seems to be: it depends. When storing split wood under shelter, where air-flow becomes more important, bark up or bark down seems to be a matter of personal preference. There is also the question of ease of handling, says Wiedenbeck. Bark down, she says, means wedge-side-up makes it easier to pick off the pile.
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