Moisture Control
Moisture in timber lining boards must be managed in order to ensure stability in service. Boards are usually supplied at an average moisture content of not more than 14 percent or less than 9 percent. They must be protected from rain and condensation by installing a vapour permeable sarking or equivalent.

For areas such as bathrooms and laundries, requirements also include:

• extra ventilation,
  
• a water repellent preservative applied to all board faces – back, ends, side and front,
  
• at least one coat of finish applied to all surfaces, plus additional coats on an 'as needs' basis,
  
• avoid use in areas that receive frequent wetting such as baths, showers or sink splash backs.