uPVC Bi Fold Doors
The main feature of Bi-fold doors is the way they open, in that they they “concertina”, or fold, to the sides of the frames leaving a huge clear space.
The leaves of the unit themselves move on tracks and can be stacked to either left, right, inside or outside the frames. Thereby allowing maximum versatility (all the leaves can open left or right or they can open in the middle and slide to the sides).
In terms of movement, even though there is a considerable amount of glass, the track systems at both top and bottom ensure the panels do not de-rail and can be maneuvered into position quite easily.
You can even find designs with concealed hinges & recessed handles, giving an even sleeker appearance.
For the sake of safety and energy efficiency, these bi-fold patio doors should be fitted with either laminated or toughened safety glass (see building regulations).
The safety glass will ensure that in the event of an accidental breakage there are no sharp pieces to cause injury to the occupants – for both laminated and toughened glass the section will stay in place if broken.
Energy efficiency is also at the top of many homeowners’ lists. With double glazed, or triple glazed, panels featuring Low-e glass or gas filled centres it will give some designs A+ ratings. Top rated units can almost achieve the same insulating quality as a solid wall – although this does not come cheap!
The 3 main materials used in the manufacture of the frames would be:
- UPVC (Vinyl)
Thresholds & Water
It is very important, due to the way Bifold door thresholds are fitted flush with floor level, that you have a well-designed threshold that drains water & is draught proof. Otherwise, at the first heavy shower, your interior could get a lot of water coming in.
Size Range for Bifold Patio Doors
Sizes are approximate
- Up to 6 feet (1.8 metre) 2 panels
- 6 feet (1.8 metre) to 10 feet (3 metres) – 3 to 4 panels
- 12 feet (3.6 metre) – 4 to 5 panels
- 14 feet (4.2 metre) – 6 panels
- 16 feet (4.8 metre) – 6 panels