Collapse and Its Removal in Pacific Madrone

Reconditioning treatment for recovery from collapse was most effective when performed at 13 percent moisture content or less at 212?F in a completely saturated atmosphere. Variables which influenced amount of shrinkage after conditioning and drying to 8 percent were heartwood type, maximum kiln temperature before conditioning, and growth-ring orientation–heartwood type had the greatest influence. A 2-hour treatment is necessary for optimum recovery. Conditions required for conditioning may be too extreme for commercial kilns; a separate steam chamber is advisable.

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