Sight lines is the term used to describe the interruptions in the view through the doors; in other words, the width of the vertical opaque areas between the glass when the doors are closed. On hinged doors, such as French doors and bi folding doors, timber and pvc frames generally have broad sight lines because, unlike aluminium, narrower frames would not be strong enough to be fit for purpose. As a guide to the width of two frames together, cheaper pvc door frames can exceed 200mm, aluminium frames are typically between 135mm and 160mm and frameless patio doors sight lines are under 40mm. Depending on the width of each door and number of doors to be installed, the difference in glass to frame ratio could be significant.
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.
Patio doors comprise an outer frame plus individual door frames. These can be made from wood (soft- and/or hard-wood), metal or alloys (usually aluminium), pvc (polyvinyl chloride, a thermo-plastic polymer - the u stands for unplasticised) or a composite material, which may comprise any of the foregoing materials plus grp (glass reinforced polymer). There is also a style known as frameless, where the vertical sides of each door have no frames.
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