These doors are different from standard doors in that they are entirely glazed (with the exception of the frames). The main reason why they are almost entirely made of glass is to allow homeowners to simultaneously relax within the confines of their homes interiors and have a wonderful of their gardens or yards. But patio doors are not just made to provide relaxation to homeowners. There are also other advantages of having them installed. In terms of aesthetics, they are superior to standard entry doors. It is certainly more pleasing to the eyes to look at this type of door if you are outside the house. Houses with nice entry doors are always eye-catching.
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.
As with timber, the quality of pvc frames available can vary - and generally, you get what you pay for. The better ones will usually be reinforced with metal, internally, for greater strength but the cheaper options can be a nightmare to live with - sticking, twisting, splitting, discolouring, warping - often within a very short time. Most usually supplied as white, some manufacturers offer limited colour options or wood effect finishes.
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