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a) Explain briefly why it is necessary to season timber.
b) State a suitable moisture content for joinery.
a) Explain briefly why it is necessary to season timber.
Timber that is well seasoned is lighter and more stable, this means it is less likely to shrink warp and split in use.
A practical example of the effect of shrinkage of unseasoned timber in use is if we manufacture and fix say architraves when the moisture content is too high and then after installation the timber dries to the equilibrium moisture content (emc) in-situ. As the timber shrinks across the board it will gave an opening effect on the mitre joints. Anyone who did not understand this shrinkage effect would comment that the mitres were poorly fitted. In fact what would be poor in this situation is cutting and fitting the mitres before the timber reached the emc. Consider second seasoning for ways to deal with this shrinkage effect.
b) State a suitable moisture content for joinery.
Interior joinery is a case where correct moisture content is important if ugly open joints, splits, or worse troubles are to be avoided. This is particularly true in air conditioned buildings where the moisture content should not exceed 10%. For normal heating in private houses 14% would prove satisfactory for the joinery work.
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