According to construction Regulations, patio doors need to meet distinct levels of thermal insulation standards to be approved. This means that continental Glass Curtains, single glazed tempered glass frameless panels, are unsuitable as external doors for the British housing market. How, then, are thermally compliant double-glazed frameless doors possible?
Patio doors are traditionally available as sliding or bi-folding panels.
3 Inch French Door Refrigerator
Because sliding doors all the time remain fixed in the middle of the top and bottom runners, the frames can be very slim, possibly frameless; the disadvantage of the principles being that at least one of the panel widths is all the time gift as a wall to unrestricted access in the middle of home and patio. Bi folding doors open fully in concertina style to stack compactly at the side of the opening. The panels are hinged together, therefore frames are valuable for the hinges to be attached to the doors, particularly to enlarge the free edges that are not supported by the fixed top and bottom runners.
The frameless glass patio doors principles has been based on the glass curtains formula of using separate panels that slide and pivot, interlocking like jigsaw pieces when closed. When fully open, the doors are stored to the side of the opening, similar to stacking bifolds.
Frameless double-glazed doors do not supply such a purely uninterrupted view as can be achieved with single glazing. This is because the double glazed unit has to be sealed with a gasket that is roughly 20mm (less than 1 inch) wide. Insulated glass or double glazing has thermal and acoustic properties attributable to the a vacuum or extra gas in the cavity in the middle of the inner and outer glass panels. A gasket needs to be reliably airtight to retain the gas or vacuum and to forestall humidity and condensation.
There is no further frame on frameless glass doors but the gasket is opaque and forms a frame-like interruption to views through a set of double glazed door panels, albeit minimal. There are places where you can setup non-double-glazed frameless glass doors, e.g. Conservatory doors, room partitions, balcony enclosures, outbuildings and commercial premises.
An overview of Frameless Glass Patio Doors
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