Shrinkage and grade retention in restraint-dried thick dimension loblolly pine

Loblolly pine dimension lumber 2.5 inches thick was milled and dried to assess the effects of restraint drying on warp and shrinkage response. Results showed a statistically significant reduction in average warp as crook, bow, and twist for the restraint-dried material. Lumber grade mix, based on warp criteria, was higher for the restraint-dried material. Shrinkage for the restraint-dried material was less than that for the unrestrained control planks.

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