Service Classes

Service Class	Description	Environmental Conditions
1	Interior	Service class characterised by moisture content in the materials corresponding to a temperature of 30 degrees and relative humidity of the surrounding area only exceeding 65% for a few weeks per year. For example: residential houses, commercial offices.
2	Exterior - under cover	Service class characterised by moisture content in the materials corresponding to a temperature of 20 degrees and relative humidity of the surrounding area only exceeding 85% for a few weeks per year. For example: open sheds, exposed beams under soffits, porches, wool scouring plants, laundries.
3	Exterior - fully exposed	Service class characterised by climatic conditions leading to higher moisture content than Service Class 2, or where the timber is directly exposed to sun and / or rain. For example: marine structures, bridges.