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.
Sash windows have one or more working parts that slide up or down to open or close. They were an advance over earlier casement windows, which hinged on the sides and swung out to open. There are many details that must be correctly done to make a sash weather tight, durable, and easy to operate. The slant of the sill downwards prevents water from pooling, for instance, which makes the wood more resistant to rot. The finer the craftsmanship in fitting all the parts together in the correct manner, the more satisfactory the replacement will be.
Wood is the traditional material for windows, which are now made also of metal and plastic. For historic houses or classic styles, replacing windows with wooden ones will satisfy both practical and aesthetic considerations. Wood also has a higher insulation factor than metal. There are many highly regarded manufacturers in the United Kingdom and Canada, as an Internet search will show. Local woodworkers, carpenters, window professionals, and building supply stores can also provide products and installation services.
If the house is a standard, modern design, if energy efficiency is paramount, or if expense must be kept low, factory windows may be chosen rather than custom designed ones. Some are manufactured to comply with regulations that will qualify the home improvement for tax credits. Others fit modern houses which are designed to use mass produced materials.
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.
Large projects that are in historic districts or are deemed worthy of period restoration can have many windows of similar design; a warehouse complex, for instance, or large barns. These projects may actually be performed on site, from measurements, crew training, and installation. The history of the building, its character, and its architectural value are the starting point for determining how replacement windows are made.
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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