By Canada. Office of Energy Efficiency.; REIC Ltd

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Using the existing casing, the door and frame can be replaced with a factory-made, coreinsulated, pre-hung unit. Installation takes less time than site-assembled systems, air seals are tighter and more durable, and these systems come with a thermally broken, adjustable sill assembly to reduce heat loss even further. A variety of materials may be used for the door face and framing, insulation and weatherstripping. In summary, when selecting doors for energy efficiency, look for: • cores of materials that maintain high insulating values; • wood, vinyl or thermally broken metal frames; • weatherstripping fabricated from high-performance, durable materials; • low air leakage rates (for pre-hung door systems); • maintenance-free framing materials; and • a high Energy Rating (ER) or a minimum of double glazing with a 12 mm (half inch) or greater air space.

Low-E, gas-filled, insulated glazing units are a good choice. You may also want to consider light-reflective glass to reduce overheating, although this may also reduce the amount of daylight. An exterior awning, reflective film, or even whitewash can be applied in summer to reduce overheating problems. An extra layer of glazing on the inside of a skylight may also reduce condensation and heat loss. If a skylight is badly deteriorated but necessary for daylighting, a replacement unit should be purchased.

In addition, the Siding and Window Dealers Association of Canada (SAWDAC) has recently developed a certification program for window installers, although it is not widely available across Canada yet. Also, many manufacturers train their own installers. Be sure to ask about installation. First, windows must be installed square, plumb and level with shims and spacers at appropriate points to ensure durability and continuing high performance. Once the window has been installed in the rough opening in the wall, care must be taken to ensure good thermal resistance and good airflow resistance around the sides of the window frame, that is, in the space between the frame and the rough opening.

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