Traditional Spring Sash Windows - Single
Spring sash windows which offer a cost-effective alternative to traditional box sash designs. They deliver classic style, but incorporate a simpler, more compact and modern spring balance mechanism in place of weights and pulleys.
Double-glazed as standard, they are available with safety glass, obscured glass, acoustic glass or solar control glass. Triple glazing is also available to special order. Twin gasketing ensures reliable weather containment. The windows are suitable for mid-range new developments, as well as replacing classic windows on non-listed buildings.
Bespoke windows and doors are available; consult manufacturer for details.
RAL classic range
Special shapes available
L10/10 Wood windows
L10/210 Wood windows
BS EN 6375-1: 2009.
To EN ISO 10077-1:2006.
To ISO 9001.
Dimensions and configurations
UK exposure category
To BS 6375-1, 1600 Pa.
To BS 6375-1, Class 4.
To BS 6375-1, Class 4A.
Resistance to wind load
To BS 6375-1, Class A4.
Operation and strength characteristics
To BS 6375-2
Concealed trickle vent.
Acoustic performance rating
To BS EN ISO 717-1, ≤36 dB.
Whole window U-value
To BS EN ISO 10077-1, ≥1.4 W/m²K.
bespoke profile options available
For opaque finishing: to BS EN 942, J10 for glazing beads, drip mouldings and the like. J40 or better for all other members.
Finish as delivered
Preservative treatment to wood components
Trickle ventilator, EA 1700, 4400, 5000 mm²
Type H1 - H6
Glazing or infill
Relevant parts of BS EN 1279.
24 mm double glass unit.
4 mm tough/ 16 mm argon/ 4 mm tough low-E - As standard.
24.8 mm sound control double glazed unit.
6.8 mm sound control laminated/ 14 mm argon/ 4 mm tough low-E.
Sashes are hung on spiral balances.
55 x 160 mm (lining width x frame depth), manufactured using mortise and tenon joints, glued and mechanically fixed.
39 x 55 mm top rail and stiles, 90 x 55 mm bottom rail, 45 x 55 mm meeting rail.
110 mm wide (70 mm for triple sash with fixed outer sash).
Sill section (height x depth)
54 x 160 mm.
Weather seal (factory applied)
The window is fully weather sealed to BS EN 6375-1.
Country of material origin
Recyclable parts of product Timber, Glass, Gaskets
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