True innovation – WARM ALUMINIUM
WarmCore, an innovative aluminium folding sliding door system which incorporates a radically different product design approach to deliver a new high performance fenestration framing solution: ‘warm aluminium’
Warmcore Bi-Fold Doors by John Fredericks
Exceptional Thermal Performance
Fully Concealed Multi Chambers extensively improve the thermal performance compared to thermally broken aluminium doors.

  • U-value of 1.4 W/m2K with 28mm double glazing
  • U-value of 1.0 W/m2K with 44mm Triple glazing

4 External Aluminium Designs

  • Pencil round
  • Chamfered
  • Square
  • Decorative

All delivering a range of classic aesthetic styles

Colour range
White, Cream, Black (RAL 9005), Grey (RAL 7016)
Offering 16 possible colour configurations to sell straight from stock, including dual-colour options:
Warmcore Bi-Fold Doors by John Fredericks
Warmcore Bi-Fold Doors by John Fredericks
Warmcore Bi-Fold Doors by John Fredericks

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