Heritage Sash Windows - Double

Frame:

100 x 140 mm (lining width x frame depth), manufactured using mortise and tenon joints, glued and mechanically fixed.

Sash:

39 x 45 mm top rail and stiles, 90 x 45 mm bottom rail, 45 x 45 mm meeting rail.

Mullion/ transom:

200 mm wide (130 mm for triple sash with fixed outer sash).

Staff/ parting beads:

Timber.

Wood moisture content:

12–19%.

Glazing beads:

External traditional putty glazed.

Sill:

Solid hardwood.

Horns:

Solid feature horns to top sashes are included as standard.

Fittings:

A lockable Fitch fastener and two finger pulls to the bottom sash.

Mechanism:

Sashes are hung on cords or chains, operating over pulleys and counterbalanced with lead weights.

Weather seal:

The window is fully weather sealed to BS EN 6375-1.

Performance:

• U-value (to BS EN ISO 10077-1): ≥1.6 W/m²K.

• Acoustic: ≤36 dB.

• Air permeability (to EN 1026:2000): Class 4.

• Water tightness (to EN 1027:2000): Class 4A.

• Wind resistance (to EN 12211:2000): Class C4.

Finish:

Three coat spray applied factory finish using water based micro-porous paint/ stain.

Trickle ventilation:

Concealed through frame head trickle ventilator. 1700 mm², 4400 mm² or 5000 mm² air flow dependent on frame width.