BIFOLD 13 .pdf
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Bifold doors now form part of almost all new build home extensions due to their ability to open
up large unobstructed openings allowing the new living space to seamlessly merge with the
The enormous growth in demand for these folding sliding doors in the UK in recent years has
led to a substantial increase in the number and type of different door systems now available to
the consumer. They are now widely available in a choice of materials and finishes with the
three most popular being thermally broken aluminium, upvc and hardwood Bifold 13.
Choosing the right bifold door for your project is an important decision and one that should not
be taken purely based on cost alone. Your budget will naturally have an influence on your
buying decision but there are other important factors that need serious consideration to ensure
you are not disappointed with your purchase. Here are the top five points that are regarded by
many as the most essential research when considering a bifold door purchase:
1. THERMAL PERFORMANCE
Since most bifold door installations will be subject to compliance with building regulations it is
important to check that the folding door you are about to buy will meet your local authority's
interpretation of current building regulations in terms of overall U-value performance. This
calculation is based on the specification of the double glazing together with the profile design
and dimensions to determine the insulation benefits of the door measured in U-values with the
lower the value the better the insulation achieved. The minimum acceptable under current
building regulations for replacement doors is a 1.8 U-value but some local authorities will insist
on lower values particularly for new build extensions.
2. GLASS SIGHT LINES
Another important consideration should be the sight line or width of door profiles between
each panel of the folding sliding door as this will affect the visible glass area available when the
door is in the closed position. Most bifold doors are designed with dedicated profiles to
minimise these sightlines as much as possible but some timber and many upvc folding doors
use wide, chunky profiles that produce very broad sight lines in excess of 200mm wide that will
ultimately spoil your view Bifold 13 LTD.
Most folding doors will feature a high security locking system but many still use face fixed or
flag hinges that can pose a possible security issue and allow the hinges to be removed from the
outside when the door is closed. Some upvc bifold doors may also use an exposed gearing
system that is accessible from the outside of the door when the door is closed which can also
pose a possible security threat. You can eliminate these potential security problems by ensuring
you choose a folding door that has fully concealed gearing and hinge fixings Bifold 13 LTD.
Although a flush threshold is the most popular option especially for internal bifold doors this
may not always be practical in some cases and a conventional raised threshold will need to be
used. It is important to note that the height of these can vary considerably with some upvc
bifold door thresholds exceeding 125mm. Such a high 'step-over' threshold may create an
accessibility issue for children and the older generation. The latest bifold door designs offer
raised thresholds designed to minimise the trip hazard with some offering thresholds as low as
5. TOP HUNG OR BOTTOM ROLLING
Some bifold doors are hung from the top to allow for a minimal threshold at floor level but with
all the weight of the door being supported from the top a substantial upgrade of the lintel is
normally required for strength and stability. Bottom rolling folding doors are a cost effective
and popular alternative since the weight of the door is carried at ground level rather than
suspended from the lintel Bifold 13.
Whether you decide on an aluminium, upvc or hardwood bifold door it is a major purchase for
your project and one that should be carefully considered to ensure the very best value for your
money. Buying a cheap bifold door may prove a disappointment unless you check carefully that
the door you are buying will meet your needs and expectations before you order.