DURABILITY PRINCIPLES
Principle
Understand material properties The designer must understand the properties of the materials they are specifying, and how these affect the building’s durability.
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Specify appropriate materials Understand the durability characteristics and select materials based on Service and Use classes.
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Risk identification Identify high-risk areas (eg roofs, wall bases, wet areas) early in the design process and choose appropriate protection strategies.
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Consider repair and maintenance Incorporate methods for inspection and repair during design stages, particularly in high risk areas. For example, use design for disassembly principles.
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Keep timber dry Mass timber can last indefinitely if kept dry. Ensure water can escape and dry quickly in case of exposure. Water detection methods need to be considered and assessed together with mitigation strategies.
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Early Intervention Act promptly if timber is exposed to water. Moisture sensors may provide early detection, but these should not be solely relied upon.
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Moisture management in assembly Contractors must implement a moisture management strategy during the building assembly. This should be include industry guidance and checklists. Special consideration must be given to the design of wet areas, which are often potential sources of long lasting damage. Remove critical vulnerabilities Use redundancy-based water-damage mitigation strategies to ensure durability even if one defence layer fails. Durability risk analysis Every building should have a durability risk analysis that quantifies the impact of water-related damage in terms of exposure time and remediation cost.
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Repair and remediation strategy Develop a repair and remediation strategy for each new building, outlining specific risks, mitigation strategies, and remediation plans.
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DURABILITY
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