Moisture Induced Movement
Moisture induced movement must be carefully controlled in furniture and fit-out timbers to prevent cracks, joint failures and unsightly paint lines between adjoining surfaces. Timber is hygroscopic which means that as the moisture content in the air increases, so does the moisture content and size of the timber. The reverse occurs in dry conditions. Harwood is more prone to this phenonmenon than softwood.

All furniture and fit-out should allow for expansion and shrinkage of hardwood elements. Of prime importance is the need to use timber which has a moisture content suitable for the conditions expected in its service environment. In most cases, timber seasoned in accordance with AS2796.3 (MC 8-13%) will perform adequately. However, where service conditions are likely to be consistently dry (e.g. air conditioned areas), or otherwise vary from general conditions, then the material may need to be acclimatised to these conditions prior to fabrication.