Casement window

Green Building Store ULTRA triple glazed timber window outward opening casement with Passivhaus certified option

Triple glazed timber outward opening casement window (98mm profile), with Passivhaus-certified insulated frame option. Uw  0.75 – 0.68 W/m2K


Glazing & U values

Solid frame:
Whole window U value: Uw 0.75 W/m2K (Redwood)
Whole window U value Uw 0.83 W/m2K (Oak)

Insulated frame:
Whole window Uw 0.68 W/m2K (Redwood – Passivhaus certified)
Whole window Uw 0.72 W/m2K (Oak)

Glazing U value: Ug 0.52 W/m2K
Triple unit: Argon fill 52 mm
Light transmission value: 74.1%

Typical maximum sizes

Fixed light: 2500 mm x 2500 mm
Side hung: 950 mm x 1520 mm
Top hung: 1300 mm x 1650 mm

Please note: For Part Q and Secured By Design items,  there may be size restrictions. Please get in touch to discuss.

Test results

Air Permeability BS EN 12207: 600 Pa Class 4

Water tightness BS EN 12208: 1500 Pa Class E1500 (Top hung)

Water tightness BS EN 12208: 600 Pa Class 9A (Side hung)

Wind load BS  EN 12210: 1600 Pa Class C4 (Top hung)

Wind load BS  EN 12210: 2400 Pa Class CE2400 (Side hung)

Exposure category BS 6375-1: 1600 (Top hung)

Exposure category BS 6375-1: 2400 (Side hung)

* U values calculated for standard single window 1230 X 1480

Most handles are compatible with our windows and doors so if you are looking for something a bit different to what is shown please get in touch with the windows team and we will be able to find something to suit your needs.

Affiliations & Accreditations