A visible "kitemark" on the glass is the consumers assurance that the double-glazed unit has been manufactured to British standards. The BSI has numerous standards, including: U-value verification, Window Energy Rating and Window Installation. The lower the U-value, the better the thermal performance and most local authorities will require this to be 1.8 or better to meet building regulations.
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.
Because slide-and-pivot doors have no hinges, there is no requirement for a sturdy side frame; its only purpose is to cover the gasket that seals the double glazed unit. This means that the views afforded through the expanse of patio doors have minimal interruptions. At the time of writing, there are two versions of frame-less glass doors available in the UK, both using the slide-and-pivot technique: one manufacturer supplies their frameless glass doors with kite-marked double glazed units which have a visible seal, the other uses an almost transparent method of sealing their double glazing. Contemporary by design, the absence of visible characteristics makes frameless glass doors a viable option for period properties.
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