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The design of our vertical sliding sash window is the product of an extensive collaboration between the timberwindow.com technicians and consultant architect to ensure that our box sash reproduces, as faithfully possible, the simple grace of English sash windows progressively developed from early use by Wren though 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 long proven reliability of the 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.


Technical Summary

- Hardwood, softwood or oak

- Multi-layer timber sections

- Fully drained and vented

- Internally beaded

- Hung on lead weights

- Solid brass fitch chains and pulleys

- Quadruple draught strips

- Brass fitch catch to meeting rail

- Sash lifts to bottom rail

- Factory glazed with argon gas filled units soft coat energy saving glass and warm edge spacer bar to give 1.1W/m2K U-value.

- Factory finished with preservative, primer and two coats of micro-porous paint.