A visible "kitemark" on the glass is the consumers assurance that the double-glazed unit has been manufactured to British standards. The BSI has numerous standards, including: U-value verification, Window Energy Rating and Window Installation. The lower the U-value, the better the thermal performance and most local authorities will require this to be 1.8 or better to meet building regulations.
In the mid-20th century, sliding doors became very popular - two or three panels of glass that slide along grooves in the floor. To distinguish them from traditional French doors, they were marketed with the thoroughly modern name of Patio Doors and this is often the image people have today when that term is used. Easily installed in place of a window, the immediate advantages were additional natural light and access to the garden. They also became a popular option to use where a pivot door opening space was limited or where the aperture was wider than a pair of French doors. Older installations were typically single-glazed, prone to warping and usually became difficult to slide open and closed. Still available today but in a developed form with double glazing and rollers for easier sliding, the popularity of sliding doors during this century has declined as bifolding doors gained market share.
Double glazed doors are not just energy savers, they also offer other advantages for homeowners. For one thing, they offer an elegant exterior. They also allow more natural light to get inside your home. More natural light would greatly enhance the interior of your home. So, you will get a more elegant exterior and interior with this type of door. If you still have an old fashioned patio door or if you are planning to install a new patio door, consider the great benefits that you will get with a double glazed patio door. You will not only cut down your electric bill with a double glazed patio door, but you will also help reduce carbon emissions and help in keeping the well being of our environment.
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