Wood species108 Wood species →
Understanding wood17 Understanding wood →

Calculations and sizes

Care & finishing28 Care & finishing →
Choosing & buying16 Choosing & buying →
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Trees & forests40 Trees & forests →
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Understanding wood: behaviour, durability and sums

End grain of an oak trunk showing growth rings, heartwood and sapwood

The Wood Guide · Understanding wood

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Understanding wood

Why wood swells and shrinks, what a durability class means, how to calculate in cubic metres and what woodworm does. The basics that explain everything.

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Understanding wood

If you know how wood behaves, a small crack won't alarm you, you'll pick the right species for the right spot and you won't get your sums wrong. Here are the basics in plain language — from growth rings and heartwood to cubic metres and quality.

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Photos via Wikimedia Commons: End grain of an oak trunk showing growth rings, heartwood and sapwood — Friedrich Böhringer, CC BY-SA 3.0 AT · Planed Douglas fir boards with clearly visible growth rings — Philipp Zinger, CC BY-SA 3.0 · Wooden table and benches on a patio among potted plants — Acabashi, CC BY-SA 4.0 · Hand with hammer and chisel carving letters into a wooden plank — Frédérique Voisin-Demery, CC BY 2.0 · Beech (Fagus sylvatica) in full leaf — Jean-Pol GRANDMONT, CC BY 3.0