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.
The patio is one location of the house that is very versatile. It can be a place to relax and unwind after a hard days work; it can be a place to view the garden; it can be a place to have a refreshing breakfast or even an afternoon cup of coffee and it can also be an interesting nook of the house that has its special purpose for the family. In some apartments where space is more of a luxury, the added space provided by patios are quite welcome. Of course, since patios are technically outside, you must have a quality patio door that connects the interior of the house to it. This is where patio doors come in.
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.
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