External roof, wall claddings and external openings will prevent external moisture from causing undue dampness or damage.
This clause requires buildings to be constructed to provide adequate resistance to penetration by, and the accumulation of, moisture from the outside.
It contains requirements for roofs, wall claddings and external openings to:
- prevent water entry
- prevent water absorption and transmission
- prevent the accumulation of water
- allow for dissipation.
The clause applies to most buildings, as set out in the limit on application in E2.2.
The Acceptable Solution to E2 External Moisture, E2/AS1, is widely used for weathertight design. About E2/AS1 provides a general overview.
Record of amendments is a record of changes to the Acceptable Solutions, Verification Methods and handbooks.