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Expert's Corner — compressions

Water Warps Wood Opposite From What You May Think

boards compressions drying out shrinkage the finishing store water wetting wood woodfinishing woodwork woodworking

Water causes wood to swell, so most people think that wetting one side and not the other will cause the wetted side to bow – that is, increase in width so the center is higher than the edges. If the wood is thin enough, this will be the case initially. But the overall swelling or shrinking after many wettings and dryings out, no matter the thickness of the wood, will be the opposite. The wetted side will shrink and the wood, or boards, will cup. The four accompanying pictures show examples of this. With a little thought, you will most...

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