Bi Folding doors were launched around the turn of the century; they can be installed in place of French doors, where both doors are hinged to fold as they open together to one side. Bi folding doors can also span an opening to around 7 metres wide, depending on the frame chosen. A master door can be placed amongst the doors, at the ends or in the middle, wherever the opening is required; this door is a standard (pivot) opening door which enables the other doors to be pushed to the side or sides of the aperture, resulting in a sliding-folding action, concertina-style, to maximise the width of the opening between home and garden or conservatory.
Metal frames, usually aluminium, provide strength in compact form. As notoriously good conductors (which is a bad attribute for insulation), frames made from aluminium are thermally-broken, which is a good attribute. It means that the metals on the inside and outside of the door frames are not joined, preventing the temperatures from being transferred between them. A bare metal frame would look completely unattractive so it is powder-coated in a choice of over 100 standard colours, including a white that resembles pvc.
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.
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