Seasoning and Shrinkage

Seasoning characteristics are based on test results using test boards placed on 25 mm stickers. The test boards were stacked in open-sided sheds and were protected from rain and direct sunlight. Shrinkage data are given for both the radial and the tangential directions. The data expressed in percentage of the width in the green condition, are based on measurements from the green to the air-dry condition (15% m.c.).

One of the ten kiln-drying schedules shown in Appendix I is recommended for each timber. The schedules are suitable for application on timbers up to 40 mm thick. For thicknesses exceeding 40 mm but less than 75 mm, the relative humidity should be 5% higher, and for thicknesses exceeding 75 mm, the relative humidity should be 10% higher.