UPVC 2 Track Sliding Window – Smooth Gliding, Superior Efficiency
The type of window operates on a twin-rail horizontal track system, with two sashes - one fixed and one sliding - running on separate tracks within the same outer frame. The sliding sash glides effortlessly to the left or right on precision-engineered stainless-steel rollers, providing clear, unobstructed ventilation across half the window opening without any sash projecting into the room or beyond the building line. SKATE's UPVC 2 track sliding windows combine the thermal efficiency of multi-chamber uPVC profiles with smooth-gliding hardware and energy-performance glass to deliver a window system ideally suited to modern apartments, residential developments, and compact living spaces.
Why Two-Track Sliding?
The two-track configuration is the most common horizontal sliding window design. With two parallel tracks - typically at the bottom of the frame - the fixed sash occupies one track and the sliding sash occupies the other. When the sliding sash is pushed open, it overlaps partially with the fixed sash behind it, providing a clear opening equal to slightly less than half the overall frame width. This is sufficient for comfortable natural ventilation in most residential room sizes.
The two-track system offers a simpler, more cost-effective design than three- or four-track alternatives, while still providing smooth operation, reliable weather sealing, and an uncluttered visual profile. For wider openings or greater ventilation area, SKATE's three- and four-track sliding window configurations are available as upgraded options.
Technical Specifications
| Profile Material | uPVC (Multi-Chamber) |
| Profile Wall Thickness | 1.6 mm / 1.8 mm |
| Profile Width |
65 mm – 120 mm (Double Track) |
| Glass Options |
DGU / TGU · Low-E · Argon-filled |
| Glazing Thickness |
32 mm (5+12A+5) up to 36 mm TGU |
| Air Leakage |
≤ 0.1 cfm/ft² | Class 4 (EN 12207) |
| Water Tightness |
E1000 Pa (EN 12208) |
| Wind Load |
Air Leakage ≥ 2000 Pa | Class C5 (EN 12210) |
| Sound Insulation (Rw) |
Rw 38 – 44 dB |
|
Rw 38 – 44 dB |
Precision Stainless-Steel Rollers |
| Available Materials |
Vinyl / uPVC |
| Certifications | CE, NFRC, AS 2047 |
Sliding Mechanism & Roller System
The quality of the roller system is the primary determinant of sliding window long-term performance. SKATE's UPVC 2 track sliding windows are fitted with adjustable stainless-steel tandem rollers that roll on a stainless-steel track rail, providing a smooth, near-silent gliding action that requires minimal hand force. The rollers are adjustable after installation to compensate for any minor frame settlement, maintaining correct sash alignment and weather seal contact throughout the window's service life.
The track is designed with an integrated drainage channel that directs any water collecting in the lower track out through weep holes to the exterior, preventing water accumulation and the interior water ingress it could cause.
Weather Sealing
The UPVC 2 track sliding window uses a combination of brush pile seals at the meeting stile (where the two sashes overlap) and compression seals at the top and bottom rails to prevent air and water infiltration. The brush pile seals provide low-friction operation while maintaining consistent contact along the full height of the sash, even as the sash wears over time. Compression seals at the outer perimeter ensure the frame-to-wall junction is fully weathertight.
Glass Performance Options
SKATE's UPVC 2 track sliding windows accept the full range of glazing configurations:
Standard DGU (5+12A+5 mm)
Basic energy performance, Ug ~2.7 W/m²K
Double Low-E + Argon (5+12Ar+5 mm)
Ug ~1.6 W/m²K - standard energy-efficient specification
Enhanced Double Glass (6+16Ar+6 mm)
Ug ~1.3 W/m²K - high performance
Triple Low-E + Argon (5+12Ar+5+12Ar+5 mm)
Ug ~0.8 W/m²K - passive house specification
Security Features
SKATE's UPVC 2 track sliding windows include a keyed handle lock as standard, supplementing the rolling sash's anti-lift device that prevents the sash from being lifted off the track from outside. Optional secondary security devices include metal anti-slide pins, keyed cylinder locks at the meeting rail, and hook bolt locks for enhanced burglar resistance.
Surface & Colour Options
White, cream, and grey-toned uPVC with woodgrain foil-laminated options are available. Anthracite Grey and Basalt Grey are particularly popular in contemporary residential developments. Dual-colour configurations (e.g., grey exterior / white interior) are available as factory-applied options.
Typical Applications
The window is widely used in: apartments and mid-rise residential buildings; terraced and semi-detached houses; commercial and retail shopfronts; spaces where windows must not project into the room when open (narrow rooms, balconies, walkways); warm-climate regions where maximum ventilation with a horizontal design is preferred; and cost-conscious residential projects requiring reliable energy-efficient performance.
Frequently Asked Questions
Q: Can the sliding sash be removed for cleaning?
A: Yes. The sliding sash can be lifted and tilted to remove it from the track, allowing both sides of the glass to be cleaned from inside the building.
Q: Is the sliding track prone to trapping dirt and debris?
A: The track's low profile and drainage design minimise debris accumulation. Periodic vacuuming and wiping of the track are sufficient maintenance.
Q: What is the maximum single sash width for a 2-track sliding window?
A: Typical maximum sliding sash widths are 1,200 mm – 1,500 mm. Wider sashes require heavier rollers and may require assessment for glass weight.
Why Choose SKATE
SKATE manufactures UPVC 2 track sliding windows at our direct 160,000 m² production facility in China, backed by 29 years of fenestration experience, CE, NFRC, and AS 2047 certification, and proven supply to over 30 countries worldwide.
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