Vertical Curtain Wall
Transparent vertical building envelopes with a precise mullion-and-transom grid.
Forster Steel Profile Systems
Thermally Insulated Attachment Curtain Wall
forster thermfix light
A refined thermally insulated attachment façade system for vertical, sloped and roof glazing, combining the architectural strength of steel with slim 50 mm sightlines and exceptional design freedom.
Façade · Steel · Transparency · Thermal Performance
01 / System
Architectural Attachment Façade
A lightweight façade concept.
A lightweight façade concept.
Built around the strength of steel.
forster thermfix light is a thermally insulated attachment curtain-wall system developed for highly transparent architectural glazing.
Its sealing and glazing system can be applied to commercially available structural steel profiles, giving architects and façade designers considerable freedom when selecting and sizing the supporting structure.
With consistent 50 mm sightlines, large glass dimensions and solutions for vertical, sloped and roof glazing, thermfix light combines economical construction with a refined architectural appearance.
50 mm
Façade Sightline
Consistent mullion and transom width for a refined architectural grid.
60 mm
Maximum Filling Thickness
Supports substantial insulating glazing constructions.
450 kg
Maximum Filling Weight
Engineered for large and demanding façade glazing elements.
Uf 1.00
Thermal Performance
Mullion / transom frame values down to approximately 1.00 W/m²K.
02 / Principle
Attachment Façade Technology
The structure carries.
The structure carries.
thermfix light completes the façade.
The attachment principle allows the glazed façade to be combined with an independently selected structural subframe, opening up significant architectural and structural freedom.
50 mm
Consistent External Sightline
The glazing and sealing components are attached to the structural supporting profiles, creating a precise continuous façade grid.
01
Structural Freedom
Supporting profiles can be selected according to architectural dimensions and structural requirements.
02
Slim Exterior Grid
A 50 mm external sightline creates a consistent and refined façade appearance.
03
Efficient Processing
The attachment system is designed for straightforward fabrication and economical façade construction.
04
Dry Glazing
Dry glazing technology contributes to clean fabrication and reliable façade installation.
03 / Applications
Façade & Roof Glazing
From vertical façades
From vertical façades
to complex glazed roofs.
One system concept can address multiple architectural glazing situations while maintaining a consistent façade language.
Sloped Glazing
Thermally insulated inclined glass constructions for atria and architectural roofs.
Roof Glazing
Glazed roofs, halls, pyramids and architectural overhead glazing.
Fire-Resistant Glazing
Tested fire-protection solutions are available for selected sloped and horizontal applications.
04 / Performance
Building Envelope Performance
Transparency outside.
Transparency outside.
Technical performance within.
Thermal Insulation
1.00
Uf · W/(m²K)
Representative mullion / transom frame performance according to Forster system documentation.
Watertightness
RE 1200 Pa
High resistance against driving rain for demanding façade applications.
Air Permeability
AE 1200 Pa
High level of façade air-tightness in tested configurations.
Wind Load
2500 Pa
Resistance to wind loading with safety load up to approximately 3600 Pa.
Filling Weight
450 kg
Suitable for substantial insulating glass units and architectural glazing.
05 / Technical
Core System Characteristics
Engineered around
Engineered around
a precise 50 mm grid.
forster thermfix light
Thermally Insulated Attachment Façade
System Construction
System Type
Attachment Curtain Wall
Sightline
50 mm
Supporting Structure
Steel profiles
Cover Caps
Aluminium / Stainless Steel
Glazing Method
Dry Glazing
CE / UKCA
EN 13830
Glass & Performance
Maximum Filling Thickness
60 mm
Maximum Filling Weight
450 kg
Thermal Performance
Uf up to 1.00 W/m²K*
Watertightness
RE 1200 Pa*
Air Permeability
AE 1200 Pa*
Wind Load
2500 Pa*
*Performance depends on façade geometry, structural profiles, glass specification, dimensions, supports and country-specific approvals. Final project design should always be verified using current Forster technical documentation and structural calculations.
06 / Dimensions
Large Architectural Glazing
Designed for expansive
Designed for expansive
glazed surfaces.
Sloped Glazing
∞ × 4009
mm
Representative maximum span for sloped glazing at approximately 16°–80° inclination.
Horizontal Glazing
∞ × 3980
mm
Horizontal glazing can extend continuously in width, subject to structural design.
Glass Construction
60 mm
Maximum Filling
Supports substantial insulated glazing constructions for modern façade requirements.
07 / Fire
Fire-Resistant Glazing
Architectural transparency
Architectural transparency
with tested protection.
Dedicated thermfix light configurations extend the attachment façade concept to selected fire-resistant sloped and horizontal glazing applications.
Integrity
E30
Fire Integrity
Selected configurations can provide tested fire-integrity performance.
Insulation
EI30
Fire Insulation
Fire-resistant roof and inclined glazing is available in approved configurations.
Extended Protection
EI60
Higher Fire Resistance
Selected system constructions extend protection to EI60 depending on application and approval.
08 / Structure
Design Freedom
The façade adapts
The façade adapts
to the architecture.
50
Millimetre Façade Grid
The attachment principle separates the external glazing system from the structural depth required by the project.
01
Steel Substructure
Structural steel profiles provide high load-bearing capacity and allow substantial façade depths.
02
Structural Optimisation
Profile depth can be selected according to span, wind load and façade geometry.
03
Architectural Flexibility
The supporting structure can become an intentional part of the interior architectural expression.
04
Cover Cap Options
Aluminium and stainless-steel external cover strips allow different façade aesthetics.
09 / Architecture
Architectural Advantages
Technical freedom
Technical freedom
with a disciplined façade grid.
01
50 mm Sightlines
Consistent slim mullion and transom
appearance throughout the façade.
02
Large Glass Areas
High structural capability supports
generous architectural glazing.
03
Free Substructure
Structural dimensions can respond
directly to project requirements.
04
Roof & Façade
One architectural system language
across vertical and inclined glazing.
Responsible Construction
Steel designed
Steel designed
for long life.
thermfix light combines durable façade construction with environmental documentation and low-carbon steel options.
- Steel structural construction
- Durable façade components
- Long service-life potential
- Highly recyclable materials
- Low Carbon Emission Steel available
- Environmental Product Declaration available
- EPD according to ISO 14025
- CE / UKCA façade documentation
Key Features
thermfix light
thermfix light
at a glance.
A flexible thermally insulated attachment façade combining steel structural freedom with refined 50 mm architectural sightlines.
- 50 mm mullion / transom sightline
- Thermally insulated façade system
- Attachment curtain-wall construction
- Vertical façade glazing
- Sloped & horizontal glazing
- Maximum filling thickness 60 mm
- Maximum filling weight 450 kg
- Uf down to approximately 1.00 W/m²K
- RE 1200 Pa watertightness
- AE 1200 Pa air permeability
- E30 / EI30 / EI60 fire configurations
- EPD & Low Carbon Steel options
Curtain Wall & Façade Project Enquiries
Design transparent architecture with forster thermfix light.
Contact Mparolas for Forster thermfix light curtain walls, sloped glazing, roof glazing, façade engineering, technical detailing and project-specific steel façade solutions.
