After fitting the new wheels, make sure that they are adjusted completely flat or into the bottom section. This will give you more room when re-fitting the patio door. The wheels can be adjusted to the correct height after the door is fitted into the frame. Spray the wheels with a silicone lubricating spray. Before re-fitting the door, clear out any debris such as leaves and dirt from the track and spray the track, locking mechanism and top door channel with a silicone lubricating spray. Re-fit the door and adjust the wheels as described above.
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.
An alternative solution is to order patio doors with integral horizontal blinds, factory sealed inside the double-glazing cavity. Proven to be reliable, the blinds can be operated via a magnet system (there is an alternative electronic option) that enables the slats to be easily angled to control the amount of light filtering through and can also raise and lower the blinds for maximum light or shade. A major advantage of opting for internally sealed blinds rather than separate blinds is that they are totally maintenance-free - no arduous dusting or cleaning - and because the blinds are encapsulated inside the glazed panels, they are exceptionally difficult to break.
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