Centrally fixed aluminium window and door joinery - Build 207 (2025)
- Abbreviation
- Centrally fixed aluminium window and door joinery
- Valid from
- 24/09/2025
- Information provider
- BRANZ Limited,
- Author
- Greg Burn
- Information type
- BUILD article,
- Format
- Website, PDF,
Description
Under H1, recessed aluminium joinery systems offer enhanced thermal alignment with wall insulation, reducing thermal bridging and improving compliance with minimum construction R-values for energy-efficient building envelopes.
Scope
This article covers:
- At a glance:
- Minimum R-values for windows/doors are R0.46–R0.50 under H1/AS1.
- Traditional joinery installation can lead to significant heat loss.
- Recessed joinery improves thermal performance and building efficiency.
- Proprietary recessed systems align insulation and glazing for better results.
- Some systems are certified, while others require Alternative Solution consent.
- Ongoing research aims to enhance thermal and weathertight performance.
- Traditional aluminium joinery installation
- Centrally fixed aluminium joinery
- Centrally fixed aluminium joinery systems
- System A window installation
- System B window installation
- System C window installation
- BRANZ testing