Triple Pane Casement Windows – The Ultimate Thermal Barrier
The windows represent the highest achievable standard of thermal and acoustic performance in a side-hung opening window. By incorporating three layers of glass with two insulating gas-filled cavities rather than the single cavity of a conventional double-glazed unit, The windows reduce heat loss through the glazing by 40–50% compared to standard double glazing - dramatically improving a building's energy efficiency, reducing heating and cooling costs, and creating a noticeably more comfortable interior environment year-round. SKATE's triple pane casement windows are built on our premium 76 mm thermally-broken aluminium profile system, engineered to handle the additional weight of the triple-glazed unit while maintaining smooth single-hand operation.
Why Triple Glazing Matters
In an era of rising energy costs, tightening building regulations, and growing environmental awareness, the windows have moved from a niche specification into the mainstream for residential new builds across Northern Europe, Canada, Scandinavia, and an increasing number of markets globally. The physics are straightforward:
Dual Insulation
Two insulating cavities instead of one halves the glass's contribution to heat loss
Thermal Efficient
Low-E coatings on multiple glass surfaces multiply solar and radiative heat control
Insulated Gas
Argon or krypton gas fill in both cavities further reduces conduction and convection through the unit
Super Insulated
The total result is a glazed unit Ug value of 0.5–0.8 W/m²K, compared to 1.0–2.7 W/m²K for various grades of double glazing
Technical Specifications
| Profile Material |
6063-T5 Aluminium Alloy |
| Profile Wall Thickness |
1.8 mm / 1.6 mm |
| Profile Width |
76 mm frame / 76 mm sash |
| Thermal Break |
PA66 GF25, 30 mm Polyamide Strip |
| Glass Options | Triple Low-E + Argon / Triple Low-E + Krypton |
| Glazing Configurations |
Triple Low-E + Argon: 5+12Ar+5+12Ar+5 mm | Ug = 0.8 W/m²K | Rw = 38 dB Triple Low-E + Krypton: 4+10Kr+4+10Kr+4 mm | Ug = 0.5 W/m²K | Rw = 40 dB |
| Glazing Thickness |
34 mm – 44 mm (Argon) / 28 mm (Krypton) |
| Air Leakage |
0.1 cfm/ft² | Class 4 (EN 12207) |
| Water Tightness |
E1200 Pa (EN 12208) |
| Wind Load |
≥ 2000 Pa | Class C5 (EN 12210) |
| Sound Insulation (Rw) |
Rw 38 – 44 dB (glass and configuration dependent) |
| Certifications |
CE, NFRC, AS 2047 | Suitable for Passive House certification |
Argon vs Krypton Gas Fill
Both argon and krypton are inert, non-toxic gases used to fill the cavities between glass panes in insulating glass units. The choice between them affects both performance and cost:
SKATE offers both options within our triple pane casement window range, allowing specification to be matched to project budget and performance requirements.
Lower cost, widely available, excellent thermal performance. Optimal cavity width is 12–16 mm. Ug values of 0.8 W/m²K are standard with triple Low-E + Argon.
Higher cost, superior thermal conductivity, allows thinner cavities (8–10 mm). Particularly valuable where overall glazing unit thickness must be minimised. Ug values of 0.5 W/m²K are achievable with triple Low-E + Krypton - the specification standard for certified passive houses.
Structural Considerations
Triple pane casement windows carry significantly more weight than equivalent double-glazed units. A triple-glazed sash filling a standard 1,000 mm × 1,500 mm opening may weigh 60–80 kg - approximately 30–40% more than a comparable double-glazed unit. SKATE's triple pane casement window system addresses this through:
• Heavy-duty 3D adjustable hinges rated for sash weights up to 130 kg
• Reinforced sash profiles with internal steel reinforcement where required
• An oversized handle with geared multi-point locking for effortless single-hand closure of the heavier sash
• Structural calculations provided for all sash sizes above standard parameters
Acoustic Performance
The windows deliver Rw values of 38–44 dB through the combination of the additional glass mass, the two insulating cavities, and the peripheral multi-point sealing system. For applications requiring maximum acoustic performance, asymmetric glass configurations - different thicknesses on each of the three panes - break the resonance effects that reduce acoustic insulation at specific sound frequencies, achieving Rw values towards the upper end of this range.
Surface Finishes
All SKATE standard finishes apply: full RAL range in powder coat, PVDF, anodised, and wood grain transfer. Dual interior/exterior colour is available as standard.
Applications
The windows are specified for: passive house and near-zero energy residential projects; cold climate applications in Canada, Scandinavia, Russia, and high-altitude regions; premium residential new builds where interior comfort and energy cost reduction are priorities; acoustic applications near airports, roads, and railways; and commercial buildings targeting high energy performance certifications.
Frequently Asked Questions
Q: Are triple pane casement windows significantly heavier than double-glazed windows?
A: Yes - approximately 30–40% heavier per unit. SKATE's hardware selection and structural reinforcement options ensure safe, smooth operation regardless of glass weight.
Q: What is the payback period for upgrading from double to triple glazing?
A: This depends on local energy costs, climate severity, and heating system type. In cold climates (heating degree days > 4,000), the energy savings from triple glazing typically recover the additional cost within 7–12 years.
Q: Can triple pane casement windows be used in warm climates?
A: Yes - select the appropriate Low-E coating for solar heat rejection rather than retention, and specify a suitable SHGC value for your climate zone.
Why Choose SKATE
SKATE's 29-year aluminium manufacturing heritage, direct factory supply, and CE/NFRC/AS 2047 certification make us the trusted source for triple pane casement windows that deliver verified thermal performance, not just marketing claims. We support projects in over 30 countries with full technical documentation and after-sales service.
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