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.
Installing these doors isnt as simple as it may seem and should therefore only be done by a professional. This is because it is important to get a tight seal, as well as ensure that the weather stripping in the door frame has been placed properly. This particularly applies to the older homes as it can often prove challenging when hanging the doors such that they are plumb, be able to seal out the elements and still be able to open and close the doors easily. Be sure to also select doors that will fit into the space without requiring any modifications. It is therefore advisable to dig deeper into your pocket to find the cash to pay for a professional door installation service that will ensure that your patio doors are perfectly installed the first time around.
There are also many styles of the patio door. Some patio doors are made using the French door design, where the single panel of glass is cut into several pieces. The door frame of the French door has mullions, the bars where the glass panels are attached. Using a French deck door still creates the same transparent effect, although with a little more elegance.Some deck doors make use of sidelights to create a more spacious look. Sidelights are door-length windows installed at either side of the door. They may only be windows but they also use glass panels, making them transparent and letting more light and view into the house. Sidelights may either be narrower than or as wide as the doors themselves.
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