REASON ONE

TRADITION AND MODERNITY

REASON ONE is the aluminium-wood system representing the pinnacle of many years of research by the Starpur Group. Its genesis is the SW60TT system, and it was born from the need to offer a product capable of guaranteeing new performance levels and a design with less classic, more modern lines.

Thanks to thermally broken profiles made with low-density polyamide strips and geometry designed to create multiple insulating chambers, the Reason One system represents excellence in thermal insulation, achieving U_w values as low as 0,90 W/m²K.

SYSTEM BASE DIMENSIONS
Fixed frame: 81 mm
Opening sash: 95,50 mm
Rebate flange: 25,50 mm
Insulated glass unit: 29 to 41 mm

Central mullion section: 159 mm
Lateral jamb section: 110,50 mm – “L” frame
Lateral jamb section: 136 mm – “Z” frame
Bottom sill section: 110,50 mm – standard threshold

Open joint system with flush sash

THERMAL TRANSMITTANCE
U_w up to 1.10 W/m²K – single-leaf window
U_w up to 1.20 W/m²K – double-leaf window

ACOUSTIC INSULATION
R_w up to 46 dB

GLAZING APPLICATION
Snap-fit aluminium glazing bead

MATERIALS
Aluminum alloy 6060 (UNI 3569)
Solid wood: oak, ash, cherry

TEST RESULTS
Air permeability (EN 1026) – class 4
Water tightness (EN 1027) – class E1200
Wind resistance (EN 12211) – class C5
Frame thermal transmittance (EN ISO 10077-2) U_f = 1,45 W/m²K

REASON ONE

why choose it

It’s tradition: It is the aluminium-wood system that has its genesis in the SW60TT system.

It’s modernity: The Reason One geometries are characterized by square, modern lines. Enhancing the design are the wood profiles that compose the flush sash—meaning the system does not feature a visible glazing bead, thanks to the use of a snap-fit aluminium glazing bead concealed by the wood trim.