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.
Once the measurements have been taken care of, it is time to explore the market for the right kind of door to fit the patio area. The most effective way to decide over the different types of patio doors is by looking at layout and design of the patio itself. If the patio windows are made up of glass walls, a glass patio door will fit best. If a home features a screened in patio, a screen door will look most appropriate. After the type of door is chosen, different costs will be incurred for the different types of doors. Glass patio doors are going to cost a little bit more but can serve as storm doors that insulate the home much better. These doors tend to cost in the $200 or more range but are effective and elegant pieces to add to the patio setting.
Sight lines is the term used to describe the interruptions in the view through the doors; in other words, the width of the vertical opaque areas between the glass when the doors are closed. On hinged doors, such as French doors and bi folding doors, timber and pvc frames generally have broad sight lines because, unlike aluminium, narrower frames would not be strong enough to be fit for purpose. As a guide to the width of two frames together, cheaper pvc door frames can exceed 200mm, aluminium frames are typically between 135mm and 160mm and frameless patio doors sight lines are under 40mm. Depending on the width of each door and number of doors to be installed, the difference in glass to frame ratio could be significant.
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