Fire Rated Curtain Walling

Fire Rated Aluminium Curtain Walling Systems

THWC Fire Rated Windows & Doors designs, manufactures and installs fire rated aluminium curtain walling systems for commercial, public sector and multi-occupancy developments.

Designed to support modern architectural façades, these systems combine large glazed areas with fire resistance performance, allowing architects and contractors to achieve both design ambition and fire safety requirements.

Suitable for integration within wider glazing packages, fire rated curtain walling provides a lightweight solution for façades, glazed screens and roof structures while supporting compartmentation strategies.

London Fire Rated Curtain Walling from the outside

Fire Rated Curtain Wall Systems

The MB-SR50 EI and MB-SR50N EI systems have been developed for the fabrication of fire rated curtain walls, glazed façades and fire resistant glazed roof structures.

Designed as lightweight aluminium systems, they support a wide range of architectural configurations while delivering fire resistance classifications from EI15 to EI60.

Key system characteristics include:

Fire resistance classifications from EI15 to EI60
Suitable for fire rated curtain walls and façades
Suitable for fire resistant glazed roof applications
Non-fire spreading (NRO) classification
Mullion depths from 85mm to 225mm
Transom depths from 65mm to 189.5mm
Integration with MB-78EI fire rated door systems
Compatible with angled and inclined façade designs

Technical Specification	MB-SR50 EI	MB-SR50N EI
Mullions Depth	85 – 185mm	85 – 225mm
Transoms Depth	65 – 145mm	69.5 – 189.5mm
Inertia mullions (coefficient. range Ix)	88.47 – 725.81 cm4	81.43 – 1222.14 cm4
Inertia transoms (coefficient. range Iz)	42.02 – 263.48 cm4	87.34 – 629.54 cm4
Width of Profiles	50mm	50mm
Glazing Range	16 – 64mm	16 – 64mm

Technical Parameters	MB-SR50 EI MB-SR50N EI
Air Permeability	Class AE 1050, EN 12152
Watertightness	Class RE 1200, EN 12154
Fire Resistance	Classes EI 30, E145, EI 60, EN13501-2
Thermal insulation (coeff. Uf)	from 1.8 W/(m2K)

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Fire Rated Curtain Walling – specification = mullion cross section EI 45 – 60

Fire Rated Curtain Walling – specification = mullion cross section EI 15 – 30

Fire Rated Curtain Walling – specification = mullion cross section 90 degrees EL 15-30

Fire Rated Curtain Walling – specification = mullion cross section 7.5 EL 15-30

Fire Rated Curtain Walling – Layout – Maximum dimesnions of panels in curtain walls

*Based on 2000x1100mm window with triple glazing, warm spacer and EI30 fire resisting glass.

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Fire Rated Curtain Walling installation in London

Fire Rated Silicone Joined Curtain Walling

The MB-SR50 EI EFEKT system is designed for the fabrication of fire rated infill curtain walls where a flush external appearance is required.

Unlike traditional curtain wall systems, the façade is free from visible external aluminium elements, creating a clean glazed aesthetic while maintaining fire resistance classifications from EI15 to EI60.

Key system characteristics include:

Fire resistance classifications from EI30 to EI60
Silicone joined façade appearance with no visible external aluminium profiles
Suitable for vertical façades and glazed roof applications
Façade inclination up to ±15° from vertical
Accommodates fire resistant glazing up to 64mm thick
Single and double glazed fire resistant units available
Fire protection inserts incorporated within profile construction
Steel accessories, specialist bolts and expanding tapes for high-temperature protection

Technical Specification	MB-SR50N EI EFEKT
Frame/Mullion depth	85 – 225mm
Leaf/Transom depth	69.5 – 189.5mm
Mullion stiffness (coeff. range Ix)	81.34 – 1222.14 cm4
Transom stiffness (coeff. range Iz)	49.54 – 629.54 cm4
Profiles width	50mm
Glazing Range	36 – 64mm

Technical Parameters	MR-SR50N EI EFEKT
Air Permeability	CLASS AE1200 Pa; EN 12153:2004
Water-tightness	Class RE1200; EN 12155:2004
Wind Resistance	2400 Pa / 3600 Pa; PN-EN 12179:2004
Impact Resistance	Class I5/E5; EN 13049:2004, EN 14019:2006

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Fire Rated Silicone Joined Curtain Walling

Fire Rated Silicone Joined Curtain Walling – Layout – Max. dimension of walls

Fire Rated Silicone Joined Curtain Walling – Architect – Transom cross section

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Architectural Design Flexibility

Fire rated curtain walling systems allow architects and specifiers to create large glazed façades without compromising fire safety requirements.

The MB-SR50 EI and MB-SR50N EI systems offer different profile aesthetics, allowing projects to achieve either a softer rounded appearance or a sharper flush-grid design while maintaining the required fire performance.

For projects seeking a seamless glazed façade appearance, the silicone joined EFEKT system provides an alternative solution with no visible external aluminium elements.

Arrange a Site Survey

Our team can assess your project requirements and recommend the most appropriate fire rated curtain walling solution.

Contact us on XXXXXXXXX to arrange a site survey.