p31a - 300 Series

Outward Opening Alu-Clad

High performance timber outward opening window with external aluminium cladding and triple glazing.
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This triple glazed outward opening window with aluminium cladding delivers excellent performance and is suitable for extremely energy efficient homes including Passive houses. Build It named the P31 as their Window of the Year 2023.

The external aluminium cladding ensures that the timber frame is protected from the elements and helps improve longevity whilst requiring minimal maintenance.

The technically advanced sprayed coatings give the timber enhanced durability and a superb finish, while the aluminium cladding is polyester powder coated. Both the aluminium cladding and the timber frame are available in a full range of RAL colours. 

The triple glazed unit is a 48 mm unit with argon gas filling, warm edge spacer bar  and two panes of Low-E glass. Whole window U-Values are around 0.75 W/m²K. 

The frame is available in depths from 94 mm to 122 mm. On the deeper section frame a decorative moulding finish is available.

  Thermal Performance
U Value (typical) 0.75
  Sound Performance
Decibels (typical) 33db
  Security Performance
PAS 24
Opening types Fixed pane, Top hung, Side hung, Fully reversible
Frame depth 94/122 mm
Whole window U-value 0.75 W/m²K
Glass U-value 0.53 W/m²K
Glass package 48 mm triple glazed, two panes Low-E, argon filled
Sound insulation 33 db
Air permeability Class 4 (EN 12207:2000)
Watertightness Class E1500 (EN 12208:2001)
Wind load NPD
Timber Colours RAL
Aluminium Colours RAL, IGP textured
Data sheet p31a.pdf
Drawing p31a.dwg
  Thermal Performance
U Value (typical) 0.75
0.6 0.8 1.0 1.2 1.4 1.6 1.8
  Sound Performance
Decibels (typical) 33db
  Security Performance
PAS 24

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