Traditional Sash Windows

Our vertical sliding sash window is the product of an extensive collaboration between our technicians and consultant architect to ensure that our box sash reproduces, as faithfully as possible, the simple grace of English sash windows. Click on the tabs below to find out more and view the range of options available.

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The design of our vertical sliding sash window is the product of an extensive collaboration between our technicians and consultant architect to ensure that our box sash reproduces, as faithfully as possible, the simple grace of English sash windows progressively developed from early use by Wren through their peak of elegance in the late Georgian period and in common usage by the Victorians and Edwardians.

In particular, the dimensions of our sash frames, meeting rails and glazing bars have been made slim, with traditional mouldings subtly modified to suit modern construction technology.

To carry the extra weight of double-glazed units, our sliding sashes are hung on solid brass chains (sash cords stretch and break) retaining the long proven reliability of simple counterbalance weights.

Quadruple draught strips stop rattles, and extremely high insulation (1.1W/m2K) glazing units minimise heat loss and down draughts. Multi-layer timber and very careful attention to detail, minimise the swelling and warping that causes jamming on windows of lesser quality during wet weather.

1. multi-layer timber sections with opposing grains, balances warping and combats twisting

The use of multi-layer timber is long established in Britain for long span timber structures in demanding environments such as swimming pools and bridges. In common use on the continent, but very rare in Britain, is the use for window and door sections. This multi-layer structure is particularly effective in resisting warping and twisting as the opposing grains even out natural moisture movement. And It is the twisting of timber during wet weather, more than the swelling itself, which causes windows and doors to stick. Multi-layer timber sections are used as standard throughout our range.

2. exceptional optical clarity

Advanced glass technology not only provides enhanced thermal performance but also much improved clarity of appearance, particularly compared to traditional hard coated low e glasses. High light transmittance (77%) maximises the entry of natural light into the home.

3. glazing units almost twice as effective as ordinary double glazing

All products are glazed as standard with double-glazed units which incorporate an enhanced thermally insulating glass to provide an extremely low U-value. We further improve the efficiency of the unit by filling the cavity with argon gas and using low conductivity spacer bars to minimise edge losses. The result is a 1.1 W/m2K centre pane u-value. This means an 80% increase in energy savings compared to single glazing, and a 45% increase in energy savings compared to ordinary double glazing.

4. internal beads for security

Glass is fitted from room side to prohibit would be intruders from gaining entry by removing the glass.

5. damage free re-glazing

In the event of glass breakage all our windows and doors can be re-glazed without damage to the surrounding window frame; no need even to re-paint!

6. neat, coloured silicone seals

Purpose-made grooves are provided internally and externally to receive the silicone necessary to protect against water ingress. Appropriate coloured or clear silicone is factory applied to guarantee a perfect, unobtrusive seal.

7. warm edge spacer bars

Low conductivity spacer bars further help to minimise heat loss and combat condensation levels on the inner pane.

8. rebated glazing beads eliminate unsightly gaps between the frame and bead

In conventional timber sections, paint is prone to cracking at the point where the bead meets the window frame. By rebating the glazing bead over the sash we conceal the joint and guard against these unattractive lines.

9. drainage and ventilation channels help prevent double glazing from misting

Drainage and ventilation channels protect against the failure of double glazed units which occurs in conventional systems when glazing units are allowed to sit in water that has become trapped within the frame.

10. fully draught stripped

11. factory applied micro-porous coatings provide maximum protection with minimal maintenance

Factory painting prior to assembly best protects timber from moisture absorption and is essential for longevity. All our products receive a base coat of timber preservative, then a primer coat, followed by two coats of micro-porous paint. Broadly speaking one should expect our coatings to last from five to eight years without the need for re-treatment. Redecoration itself is a very simple task as there is no sanding down or preparation required. An average window should take about thirty minutes to re-decorate.

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2 Hurn Road, Business Park, Dereham, Norfolk NR19 1WD
Tel: 01362 692212 Fax: 01362 692267

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