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.
Remove the two screws holding the bottom section of the frame. There is one screw either side of the bottom section. Once these have been removed the bottom section can be prized away from the rest of the frame. Be careful not to lever against the glass or you could shatter it. When the bottom section is clear from the rest of the frame you will be able to remove the wheels. Some wheels have a screw holding them in and some are pressed into a holding bracket. If the retaining screws have rusted you can carefully drill them out, taking care not to make the hole in the bottom section any bigger. Contact your local Hardware Store, Glazing Shop or search on Google for replacement wheels.
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.
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