Modern manufacturing processes for wooden sash windows have not changed all that much over the years, since custom work dominates this field, whether the units come from a national company like Sears or a local woodworking mill. There are standard window sizes which are available as well from building supply houses and online sites.
Wood is the preferred material for windows, having a higher insulating power than metal and being both beautiful and traditional. Sashes are the moving parts of a box window, the sections that move up and down to ventilate the room. This design dates from the 1700s, as a ‘new’ innovation over the casement window, which swung open from side hinges. The style has been popular ever since.
Windows with sashes and frames must have tight joints, properly slanted sills to drain off water, and balance weights or other devices inset that keep them in the desired position. Expert craftsman are just as important today to properly assemble products. Many premier makers are located in the United Kingdom and in Canada, but all manufacturers offer custom work from precise measurements and ship their products all over the world.
Some mills are still using machinery dating from earlier centuries, since many of the processes are the same. Carpenters also make new windows or replace old ones at the site. For many historic properties and houses of architectural merit, perfect reproductions or precise replicas are the only suitable choice.
Even quality reproductions, made unit by unit on demand, may have special porous paint that is waterproof, while allowing the wood to breathe out moisture for longer life. Panes may be single, or many set in wooden frames, and the glazing and caulking must be expertly done for years of weather resistance. New windows may be double glazed for additional insulation from heat, cold, and sound, or made with special acoustic or thermal glass. The traditional look of a classic home is preserved while the homeowner still gets the benefit of modern technology.
Expense is not always higher for custom work. In the case of large, architecturally important buildings, many similar windows can be replaced on site for less money per unit. The custom windows can satisfy requirements of historic committees, retain the architectural purity of the building, and be guaranteed for performance and long life.
Modern manufacturing processes for wooden sash windows are a mix of old technology and new, with the best of both offered for new construction or replacement.
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