Craft · 6 pages · 12 min
How wood moves with humidity
Wood swells and shrinks across the grain as the air gives it moisture or takes moisture back.
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From the opening
Wood is hygroscopic, so its cell walls take up water vapor when the air is damp and give that vapor back when the air is dry. The walls swell or shrink with that bound water, and a board changes size even though rain never touched it. The opening covers cell walls take on vapor, movement is across the grain, and ring direction moves the most.
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Inside
- Cell walls take on vapor
- Movement is across the grain
- Ring direction moves the most
- A free panel can return
- Where the idea stops applying
- A distinction worth keeping
Sources
- Hygroscopic swelling of wood cell walls
- Tangential shrinkage greater than radial