Overview
Double hung windows provide a vertically sliding, dual-sash solution that delivers controlled cross-ventilation, low outward projection and robust compliance potential for Australian residential projects. Proline’s Double Hung systems are engineered for durability, serviceability and façade integration in townhouse, low-rise and mid-density developments.
Why developers choose Double Hung: balanced thermal/ventilation performance, safe upper-sash ventilation for family homes, and minimal external projection for zero-lot/boundary situations.
Performance & Compliance
Proline Double Hung systems are designed and tested to meet relevant Australian regulatory and standards frameworks. Example references:
- AS 2047 – Windows & External Glazed Doors
- AS/NZS 4284 – Testing of Building Facades
- National Construction Code (NCC) 2022 — relevant clauses
- YourHome — passive ventilation guidance
Typical Test & Target Performance
- Airtightness (AS 2047): Tested to ≤ specified class per project requirements
- Water Penetration Resistance: Up to 300 Pa (project dependent; coastal upgrades available)
- Design Wind Load / Structural: AS/NZS 1170 compliance; up to 3kPa positive/negative design pressures depending on profile selection
- Acoustic Option: IGU with acoustic laminate option achieving Rw values suitable for high-noise zones (specify by project)
- Thermal: Compatible with double glazing, low-E coatings and thermal-break frames to support NCC energy compliance targets
Note: Proline will provide project-specific test certificates (NATA where required) and shop drawings on request.
Product Technical Description — Proline Double Hung System
System Structure
The Proline Double Hung window is a dual-sash vertical sliding system. Key structural elements include reinforced aluminium outer frames, interlocking sash stiles, and counterbalance mechanisms (spring or weight counterbalance options available per specification).
Frame & Profile
- High-strength extruded aluminium profiles with purpose-designed reinforcement chambers for horizontal and vertical loads.
- Thermal break option: polyamide thermal break sections to reduce thermal bridging where required.
- Powder coat finish to AS 3715 performance or anodised finish options for coastal durability.
Sash & Seals
- Fully-sealed sash interlocks with compression seals for improved airtightness and minimised rattling.
- Drainage and weep provisions designed to AS 2047 recommendations for water management.
Glazing
Proline Double Hung systems accept a range of glazing options:
- Single glazed units for internal / low performance contexts
- Insulated Glass Units (IGUs) — double glazed, argon fill available
- Low-E coatings and acoustic laminate options for specific thermal and acoustic targets
Deliverables
For each project we deliver: shop drawings, sectional details, material specifications, and test certificates (NATA tested documentation available on request).
Comparison — Double Hung vs Other Window Types
Technical comparison focused on ventilation, safety, maintenance and best use cases.
| Window Type | Ventilation | Safety | Maintenance | Best Use Cases |
|---|---|---|---|---|
| Double Hung | Bi-directional natural convection | Upper-sash ventilation reduces low opening risks | Simpler sliding hardware; low maintenance | Townhouses, low-rise residential, street-facing windows |
| Casement | High ventilation, can capture wind | Outward projection can be a hazard in high wind | Hinges & stays require servicing | Detached residences, areas prioritising max ventilation |
| Awning | Moderate; good in rain conditions | Small projection; generally safe | Low maintenance | Kitchens, bathrooms, rainy climates |
| Sliding | Limited (approx. 50% opening) | Stable; minimal projection | Low maintenance | Budget projects, apartment complexes |
| Bi-Fold | Maximum opening & airflow | Relies on multiple locking points | Periodic adjustment & service | Large openings, alfresco connections, high-end projects |
| Tilt & Turn | Flexible modes: tilt for ventilation, turn for egress | High security & airtightness | Durable; higher hardware complexity | High-performance / energy-efficient dwellings |
Applications & Design Notes
- Zero-lot boundary townhouse: no external projection keeps pedestrian paths and neighbouring properties clear.
- Bedroom & child-sensitive spaces: upper sash ventilation reduces fall risk while preserving airflow.
- Coastal developments: specify anodised finishes and coastal hardware; request higher water penetration rating where necessary.
- Acoustic mitigation: pair IGUs with laminated panes for developments near transport corridors.
Proline provides project-specific specification support and NATA test copies for tender submissions.
Frequently Asked Questions
Can Proline Double Hung windows meet AS 2047 requirements?
Yes — Proline systems are designed to be specified and tested to AS 2047 performance classes. Project verification and test certificates are provided for tender submissions.
Do Double Hung windows provide good acoustic performance?
Yes — with the correct IGU and laminated glass combination, Double Hung systems can achieve acoustic ratings suitable for high-noise environments. Acoustic performance is glazing dependent and should be confirmed per project.
Are Double Hung windows suitable for coastal projects?
Yes — specify coastal finishes (anodised or high-performance powder coat) and upgraded hardware; Proline can provide higher water penetration test options where required.
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