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.
Patio doors may be constructed from a broad spectrum of materials. These include glass which is the most common choice, and which may be incorporated as a solid panel or in a multitude of small panels which are set within a frame. If you reside in colder climates, you may consider having your glass double paned, insulated or specially treated such that its able to trap the heat inside your home. Alternatively, you could go for doors made from aluminum and vinyl, which tend to be cheaper options ideal for those working with a tight budget. You should however keep in mind that you get what you pay for and should therefore not expect aluminum or vinyl doors to wear as well as the glass patio doors.
Patios are designed to be a continuation of the house into the backyard area, and with this in mind, the doors often have quite a bit of glass in them to offer you a good view. While you may enjoy this view, the thing is, there are times when youd like to have some privacy separating you from others outside and vice versa. Controlling the amount of sunlight that enters the home through the patio doors is another issue of concern. Bright light shining into a room isnt always desirable, so you need a solution that solves both problems at the same time.
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