BU527 Drained and vented cavities
- Valid from
- Information provider
- BRANZ Limited
- Information type
- BRANZ Bulletin
- Hard copy, PDF
This Bulletin outlines the basic requirements for the construction of a drained and vented cavity that is suitable for use behind a range of exterior claddings with the exception of brick veneer and other wet cavity claddings.
This bulletin covers:
- drained and vented cavity construction including air pressure barriers, flexible wall underlay, rigid air barriers, flexible flashing tape, drainage and ventilation openings, cavity closure devices and cavity battens
- cavity maintenance, including ground clearance and cavity closure blockage.