Design for Durability - Specifications

The following is a check list of some items which should be included in the specifications, considered at the design stage, or indicated on drawings:

• Hazard level
• Natural durability
• Combination natural durability and preservative treatment
• Grade i.e. special requirements (e.g. decking)
• Moisture content
• Ventilation
• Insect protection-chemical and/or mechanical (termites/marine borers)
• Sarking, flashing, vapour barriers/DPC's
• Joint detailing - shrinkage restraint and moisture traps
• Workmanship
• Finishing
• Maintenance

Reference: Timber Datafile P4 – Timber – Design for Durability of the NAFI Timber Manual.

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