Double Hung Window Guide for Australian & American Developers

As an international manufacturer of high-performance aluminium window and façade systems, GBA supplies fully certified window systems tailored for both Australian Standards (AS 2047 / NCC) and North American Standards (AAMA / NFRC).

Across residential and low-rise commercial developments in both regions, the Double Hung Window remains one of the most versatile, code-compatible, and climate-adapted window types used by developers, builders, and architects.

Why Double Hung Windows Perform Well in Both Australia & the Americas

01 Natural Ventilation Efficiency

Double Hung delivers bi-directional convection airflow—cool air enters from the bottom while warm air exits from the top.

This provides strong passive cooling for hot regions such as NSW, QLD (Australia) and Southern U.S. states such as Texas, Florida, Georgia.

Official Reference

Australia – YourHome Passive Ventilation
https://www.yourhome.gov.au/passive-design/ventilation

US Department of Energy (DOE) Natural Ventilation
https://www.energy.gov/energysaver/natural-ventilation

02 Safer Opening Method for Family & Street-facing Windows

The top sash allows ventilation without creating a low-level opening — reducing fall risks for children and meeting safety guidelines in both regions.

Australia – NCC Fall Prevention Requirements

https://ncc.abcb.gov.au/

USA – IRC (International Residential Code) Window Fall Protection

https://codes.iccsafe.org/

System Structure

• Dual-sash vertical sliding

• Spring-loaded or counterbalance system

• Reinforced aluminium profiles for AS/NZS 1170 & AAMA wind load zones

• Interlocking sash design for improved airtightness and reduced rattling

Performance Certification

Australia

• Fully compliant with AS 2047 performance requirements

• Wind load tested to AS/NZS 1170

• Meets NCC energy efficiency provisions

Reference:
AS 2047 – Windows & External Doors
https://infostore.saiglobal.com/

United States / North America

• AAMA/WDMA/CSA 101 I.S.2/A440 compliant

• NFRC 100 / 200 thermal and solar performance rating

• Tested to ASTM E283, E330, E547 for air infiltration, structural pressure, and water penetration

Reference:
AAMA Standards
https://www.aamanet.org/

Technical Description of GBA Double Hung System

Thermal & Energy Performance

• The GBA Double Hung system is compatible with:

  • insulated glazing units (IGU)

  • Low-E glass

  • thermally broken aluminium framing

  Suitable for:

  • Australia: NCC 7-Star homes

  • North America: Energy Star certified residential buildings

Hardware & Operation

• Heavy-duty sash balance system for smooth vertical movement

• Key-lockable latch with multi-point locking upgrade

• Compatible with standard flyscreens and security screens

• Designed for high-frequency operation typical in residential projects

Comparison Table: Double Hung vs Other Window Types

Conclusion

For developers in Australia and the Americas, GBA’s Double Hung system offers a highly stable, regulation-compliant, and climate-adapted solution.

With dual certification (Australian Standards + American Standards), durable hardware, and strong ventilation & safety performance, Double Hung windows remain an excellent choice for residential, townhouse, and multi-family projects across both regions.

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Welcome to inquire for perfect solutions for your construction projects. GBA aluminum facade system includes the manufacturing and design of windows & doors, railings & staircases, awnings & pergolas, and metalwork.