Transparency and lightness are still in vogue for façades. Steel and its outstanding structural properties perfectly meet these requirements

VISS SG from Schüco Jansen Steel Systems is a structural glazing façade system for glass surfaces of 2.5 m x 5.0 m. Variable glazing anchors allow the installation of double and triple glazing with thicknesses of up to 70 mm. 20 mm silicone joints allow an almost uniform-looking glass surface.

For large opening units, there is now a projected top-hung window that matches the uniform structural glazing look and integrates almost invisibly into the façade skin. European Technical Approval (ETAG 002) is pending for the mullion-transom system.


Fabrication benefits

  • Efficient fabrication with proven VISS system technology
  • All system components tested for the compatibility of the individual materials with glass-edge bonding
  • No approvals in individual cases for structural glazing steel façades (ETAG 002) and for TRAV

Technical information

Uf value of frame (≥)0.84 W/(m²·K)
Min. face width50 mm
Max. glass/panel thickness70 mm
Surface finishesRAL, Powder, Paint
Air permeabilityAE
WatertightnessRE 1200
Impact resistanceClass 5
Suitable for safety barrier loadingYes
Min. basic depth of mullion50 mm
Max. basic depth of mullion280 mm
Min.-max. basic depth of mullion50…280 mm
Max. face width60 mm
Min.-max. face width50…60 mm
Min. glass/panel thickness30 mm
Min.-max. glass/panel thickness30…70 mm
Butt joint width20 mm
Installation angle0-10°
Polygon façade angle5°
Wind load resistance2.0 [kN/m²]
CE markingYes
StandardsEN ISO 10077
European Technical AssessmentYes


Façade Systems – VISS SG / Semi SG

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Architecture in steel and glass

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Specification texts

Thermally insulated, self-supporting steel façade system “without external cover caps and glass pressure plates, option with gas-tight (EN 1279, Part 3) or airtight (EN 1279, Part 2) pane edge joint”
As a mullion/transom construction for multi-storey façades with an internal and external face width of 50 mm

Load-bearing structure:
The load-bearing structure of the façade construction consists of rectangular multi-chamber hollow profiles.
The load-bearing profiles are on the room side.
The transom profiles are notched and overlap the mullions where they intersect, so that any moisture is reliably drained away.
On multi-storey façades, all horizontal joints must be constructed using the joint connectors and joint tolerance seals belonging to the system.
Appropriate system-based insert profiles and half profiles, as well as expansion joint seals, must be used for vertical expansion and assembly joints.
Up to 8-metre installation height, without mechanical fixing; > 8 metres, with additional mechanical fixing

Glazing / insert units:
In the production of double glazed units, a pane of heat soaked toughened safety glass is used on the outside.
The insulating glass is mechanically fixed to the structure of the façade using screw-in glazing clips which are inserted into the pane edge joint between the double glazing panes.
The maximum distances between supports of the clips are calculated in accordance with the tables and fabrication information provided by the system manufacturer.
Depending on the pane composition and when using reinforced glazing supports in conjunction with aluminium or steel insert profiles and heavy duty connecting spigots, glass loads of up to ____ kg can be transferred per pane field (see the fabrication documentation from the system manufacturer).
Storey-height glazing with safety requirements in accordance with TRAV must be secured individually with additional glazing clips.
The remaining 20 mm wide joint between the glass edges is closed with a PE filling tape and sealed with silicone sealant: DOW CORNING, DC 795/DC 797 – SIKA AG, Elastosil 600/605.

The façades must be designed according to the principle of overall ventilation. From a unit height of 8 metres or 8 fields, the rebate base must be ventilated. For transom lengths > 1500 mm, there must be additional ventilation in the centre of the field.

Profile face widths:
Mullion, transom 50 mm

Profile basic depths, face width 50 mm:
(The formal dimensions given here are minimum requirements)
Mullion 25/50/60/80/95/120/140 mm
Transom 25/50/60/80/95/120/140 mm
Transom base point and
intermediate floor attachment 50/60/80/95/120/140 mm
Cover cap (transom)
(See architect folder for types) 12 mm


Test documents

Document type Test type Result Classification Document no. / Download
Prüfbericht Wärmedurchgangskoeffizient 1,64 bzw. 1,92 EN ISO 10077 View onlineDownload (pdf, 2.3 MB)
Prüfbericht Luftdurchlässigkeit
Widerstand gegen Windlast
Klasse AE
Klasse RE1200
2,0 zulässig, 3,0 erhöht
Klasse I5 / E5
EN 12152
EN 12154
EN 13116
EN 14019
View onlineDownload (pdf, 219.9 KB)
Prüfzeugnis Pendelschlagversuch Kategorie A, C2 und C3 View onlineDownload (pdf, 366.1 KB)
Gutachterliche Stellungnahme Luftdurchlässigkeit
Klasse 4
Klasse 9A
EN 12207
EN 12208
EN 12210
View onlineDownload (pdf, 2.8 MB)
Gutachterliche Stellungnahme Luftdurchlässigkeit
Klasse 4
Klasse 9A
EN 12207
EN 12208
EN 12210
View onlineDownload (pdf, 2.8 MB)
Gutachterliche Stellungnahme Luftdurchlässigkeit
Klasse 4
Klasse 9A
B4/C4 (2046×2046 mm)
B4/C3 (1600×2500 mm)
EN 12207
EN 12208
EN 12210
EN 12210
View onlineDownload (pdf, 2.9 MB)


Systems full of individual possibilities

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