The system
A curve is a decision, not a finish.
Arc is the Sky-Frame system for radiused elevations. The glass is curved to the building's geometry and runs on a matching curved track, so a bay, a drum or a wrapped corner opens the same way a straight run does. It can be motorised.
What's achievable depends on two things: whether a pane slides or is fixed, and how many tracks the opening carries. The tightest curve — 2.5 m — is for fixed panes on two tracks. Sliding panes start at 3.5 m.
Specify Arc when
- The elevation is already curved and the plan depends on it staying that way.
- A corner or a bay needs to open, and the curve is part of the architecture rather than a flourish.
- The radius can be fixed early — track and glass are both made to one geometry.
Look elsewhere when
- The opening is straight. Classic gives larger panes — 2.3 × 4 m against 2.0 × 3.1 m — and a simpler build.
- The radius is still moving at technical design stage.
- You need a sliding pane below a 3.5 m radius — under that, Arc panes are fixed.
Technical
Key figures
From Working with Sky-Frame. Other radii and wider elements on request.
| Property | Value | Note |
|---|---|---|
| Sliding elements | 2.0 × 3.1 m | Maximum width × height |
| Fixed elements | 2.4 × 3.1 m | Maximum width × height |
| Radius, two tracks | R 3.5–10 m · R 2.5–10 m | Sliding · fixed |
| Radius, three tracks | R 5.0–10 m | Sliding and fixed |
| With electric drive | R 3.8–10 m · R 5.0–10 m | Sky-Frame 3 — two tracks · three tracks |
| Glazing | 30 / 54 mm | Sky-Frame 2 double · Sky-Frame 3 triple |
Brochures are hosted by Sky-Frame. CAD drawings and technical documentation need a free Sky-Frame registration.
Arc in use
The other three systems
Classic
The original Sky-Frame system. Straight runs, ceiling-height glass, frames flush with floor and ceiling.
Panes to 2.3 × 4 mSlope
Sliding glass set at an angle — leaning into the room or out from the facade.
Up to 20°Pivot
A glass door that turns on an offset axis. One leaf, up to 2.5 × 4.5 m.
Leaf to 2.5 × 4.5 mFor architects
Not sure Arc is the right call?
Send the elevation and we'll say so either way. We'd rather talk you into a simpler system than sell you one you don't need.