Timber bifolding doors:
this material will need to be painted or stained every five or so years and swelling and shrinkage may stop the doors from operating correctly.
PVCu bifolding doors:
sections are normally bulky and can suffer from expansion and contraction, which can hamper the functionality of your doors.
Aluminium bifolding doors:
thermally efficient, the slim line sections are still very strong. Available in extensive colour options, they are also easy to maintain.
the thermal rating given to the sealed unit (lower value gives better rating), a good benchmark is a u value of 1.1.
triple glazed units assure better sound insulation benefits than double glazed units.
all units can be finished with a self-clean coating, reducing dirt levels and thus keeping the product cleaner.
The recognised British Standard is Pass 11 and the European Standard is W2.