Thermal break self-supporting curtain wall with mullions and transoms, with external cover available in four materials
insulated glazing of up to 56 mm
50-80-100-120-150-180 mm structural profile
perimeter EPDM gaskets for air tightness and water drainage
closed-cell polyethylene foam spacer
pre-drilled metal hold-down device bearing seals
50 mm sections for mullions and transoms in the 4F1 thermal break non-structural curtain wall façade
Extensive glass surfaces need greater inertia and consequently mullions with larger sections: 4F1 proposes the solution with structural mullions in steel, stainless steel or corten steel of reduced sections (50 mm) and elevated moment of inertia to guarantee the static values required while maintaining the effects of lightness and transparency of the faҫade. 4F1 interprets the design of the frame in numerous possible variations and integrates windows and doors guaranteeing the very best performance. The 4F1 system performance has been tested by the best European certification laboratories in conformity with the standard EN 13830 regulations.
system and performance
4F 1 is a thermal break system for curtain walls with mullions and transoms with structural sections of depths from 50 mm to 180 mm and width 50 mm. The elevated elasticity modulus of the metal guarantees a solid structure that is at the same time light and versatile. Air and water-tightness are ensured by a system of EPDM gaskets realized with drainage grooves to provide run-off for any seepage. The 56 mm glazing panel is inserted frontally and placed on specific glass supports that are secured to the structural profiles and fixed to the mullions and transoms by means of a steel external cover pre-drilled for the application of screws.
wind resistance - allowed load
± 2,0 kN/m2
wind resistance - increased load
± 3,0 kN/m2
I5 / E5
water tightness – static
water tightness – dynamic
250 Pa/750 Pa
under reference standard EN 13830
size and variations
The 4F 1 transom/mullion can be 50 mm
or 100 mm thick.
The size of the internal profiles and external covers is 50 mm;
the depth of the cover
is 16 mm for the mullions and 13 mm for the transoms.
material for transoms and mullions
4F1 structural profiles are available in galvanized steel – in a wide range of colours and superficial finishes – in brushed AISI 304 steel, in polished or Scotch Brite AISI316L stainless steel and corten steel.
material for covers
4F 1 covers are available
in galvanized steel - in a wide range of colours and superficial finishes – in AISI 304 brushed stainless steel, in AISI 316L polished or Scotch-Brite stainless steel, corten steel and in brass (OT67 copper alloy).
4F 1 comes with specific ending caps, completely concealed, in stainless steel to join the heads of the mullions with the transoms in different possible combinations.