Defects in timber

Dampness
If you use damp timber (air-dried), you risk shrinkage, warping and glue failure as is dries out. Wood from an open-sided store will contain up to 17% of its weight in water (its moisture content). If used indoors with central heating this figure will drop to about 8%. You can buy kiln-dried timber which will be ready for use. Old well-dried timber may not necessarily be a better buy than new as it often twist when re-sawn. The best way to avoid the hazards of damp timber is to store it for at least three or four weeks in the room where it is to be used. All timber shrinks or moves as it dries out. The greatest shrinkage takes place along the circumference of the annular rings

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