ABOUT SASH WINDOWS

Sash windows have been in use in the UK since the late Stuart period. From the Georgian to the Edwardian period, sash windows became the standard British window. They were counter-balanced with lead weights, suspended from a rope on each side of the window, running over a pulley. Sash windows provide great flexibility in top and bottom ventilation, and do not protrude into the room. If well maintained they can have a life of more than 100 years. Good quality replacement sash windows, using traditional technology, are now available; they are a key part of the character of a historic building. or pin.

LEADING UK SUPPLIERS OF SASH WINDOWS

Original Box Sash Window Company, based in Windsor, specialises in the manufacture of traditional oak sash windows, and hinged casement windows and doors, which look just like the originals but are fitted with double or triple glass sealed units. The company's sash windows are based on traditional designs with hardwood horns; slim hardwood glazing bars; a choice of hardwood finishes; well-concealed draught, noise and dust barriers; and very slim double or triple glass sealed units to retain space for traditional mouldings.

Ventrolla is a leading company specialising in the restoration of sash windows. All work is guaranteed for five years. A feature of the Ventrolla technique is that the whole job can be done from within the building, thus avoiding the need for any external access. Ventrolla can offer a sash remove technique, where the sashes are designed so that both top and bottom sash can be drawn into the room to enable the outside glass surface to be cleaned.

Jeld Wen UK is a leading supplier of timber windows, including sash windows. Its range of timber sash windows incorporates stepped sashes for improved performance whilst retaining traditional sight lines. They are supplied fully glazed with 24mm Low E insulating glass units. Ventilation is via concealed ventilator(s) through the head section. All windows have extended horns on the top sash and flush to frame sills as standard. As an optional extra these timber sash windows can be designed to comply with the Secured by Design standards for security enhanced windows.

Duration Windows supplies a UPVC sliding and tilting sash window in a heritage design which includes horns. Astragal bars may be specified. The inside of the window has a scotia detail. The tilt-back feature is provided to ease cleaning. The product includes an optional clip-on trim, in the shape of a traditional moulding, which is applied to conceal the mastic joint between window and brickwork. The window has provision for a 28mm double glazed unit, within which blinds can be integrated.

DETAILED INFORMATION RESOURCES ON SASH WINDOWS

We recommend the following websites, with building product information including manufacturers' specs, standard specifications, and CAD details: Barbour Compendium, RIBA Product Selector Plus, ASC Bricsnet, Building Products Index, British Board of Agrément, British Standards Online.

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