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.
Whats good about the this door is that it connects the outside world to the home. If an ordinary door with no glass panels is used, even if there is patio just outside the house, the people inside will not get to see it. On the other hand, a homeowner will be able to see the dainty veranda and the beautiful outdoors every time he passes by the porch door.Patio doors have many varieties. At most times, they use the sliding door design and can remain open throughout the day. Swinging balcony doors are also available.Courtyard doors with double-leaves add much more space in the house because of their transparent double leaves. There are also foldable patio doors. Some have two, three, or four foldable leaves, and as the leaves increase, the bigger the open area can become.
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.
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