“The wood is dry! It’s been lying around for three years!”
Okay, but Where have you been for the last three years? On the ground, where it rains and moisture seeps in from below? Or nicely shredded in a well-ventilated wooden shed, protected from rain?
That makes a real difference!
Wood can lie outdoors for three years and still be too damp for heating. Well-chopped and properly stored wood, on the other hand, dries significantly faster under favorable conditions.
Whether wood is suitable for heating depends not on its age, but on its actual moisture content.
And damp wood is often one of the reasons why the stove smokes, the glass turns black, and the chimney gets clogged.
Why does wet wood heat poorly?
Imagine placing a log filled with water inside. Before it can burn properly, some of the water must evaporate.
This consumes energy that you could otherwise use for heating.
Furthermore, damp wood cools the firebox and worsens combustion conditions. This can lead to increased smoke, soot, and tar deposits.
For conventional wood-burning stoves, firewood with a moisture content below 20% is recommended, unless otherwise specified by the manufacturer.
How can I identify dry wood without measuring it?
Dry wood is generally lighter than fresh wood, may have cracks at the ends, and often produces a ringing sound when tapped.
But beware! None of these signs is reliable proof of the correct humidity.
Wood can be wonderfully dry on the surface, but still damp inside.
And that’s exactly why it’s worth having a little helper on hand.
Hygrometer: A small device that saves you worry
A wood moisture meter is not a complicated device for experts. It is a simple tool that quickly tells you whether wood is suitable for heating.
But beware of a common mistake!
It is not enough to simply place the moisture meter on the surface of the log. The outside may be dry, while moisture remains inside.
So how do you measure correctly?
- Choose a log from the supply and split it.
- Measure the humidity on a freshly exposed interior surface according to the hygrometer instructions.
- Check multiple log files, not just one.
Some moisture meters also require you to take the type of wood and its temperature into account. Cheaper devices only provide approximate values.
How do you store firewood correctly?
Wood primarily needs air and protection from rain.
It thrives best in an airy wooden shed, where it is stored above the ground and the air can circulate around it.
Piling it directly onto the ground, letting it get soaked by the rain, and then wrapping it in an airtight tarp doesn’t help much.
Proper storage is often more important than the drying time itself.
And how long does it actually take for the wood to dry?
One year? Two? Three?
There is no universally applicable answer. It depends on the type of wood, the size of the logs, the initial moisture content, and the storage conditions.
What matters is always the resulting humidity, not the number of years in the calendar.
Our final piece of advice
“It’s been lying around for three years” is no guarantee that the wood is dry.
Anyone who regularly uses a wood-burning stove should invest in a hygrometer. It’s a small investment that can save you a lot of trouble with cloudy glass, incomplete combustion, and a blocked chimney.
Because a beautiful fire begins long before you light a match.