Double glazing consists of two or more layers of glazing separated by a
spacer along the edge and sealed to create a stable air space between the
two sheets of glass. This provides better heat and sound insulation than
standard single-glazed windows. The stable air space between the layers of glass
may be filled with air but an inert gas like argon provides better
insulating performance. Argon (Ar) has an atomic mass of 39.9, which is
much more than nitrogen (N2) and oxygen (O2)
molecules, which have a molecular mass of 28.0 and 32.0 respectively. As
a result, argon atoms move significantly slower than nitrogen and oxygen
molecules at the same temperature. This reduces convection and decreases
the energy transfer between one side of the glass and the other.
Typically the spacer is filled with desiccant to prevent condensation
and improve insulating performance. Evacuated glazing is double glazing
where the air is removed altogether, creating a vacuum.
Secondary
glazing is a form of double glazing in which a second set of frames and
glass in fitted to improve sound and heat insulation.
LEADING UK SUPPLIERS OF DOUBLE GLAZING & SECONDARY GLAZING
Jeld Wen UK is a leading supplier of
double glazed windows in timber and UPVC. Low emission glass can be used, to
provide further thermal insulation. Finish of the UPVC windows is white or
plastic wood effect, in light or dark brown.
Zenith
Staybrite Double Glazing. Zenith Staybrite is a large supplier of double
glazing units for windows and doors. Part of the Bowater Group, it supplies more
than two hundred thousand UPVC windows and doors each year. Zenith Staybrite
products include decorative double glazing, with coloured glass and leaded
designs.
Everest Double Glazing is a leading UK manufacturer of
double glazing. The Everest range of double glazing products includes double
glazed windows and doors, and conservatories. Everest also supplies roofline
products (guttering, cladding soffits etc), garage doors, security systems
(Alarms, CCTV), timber sash windows, flat roofs and driveways. Everest is a
founding member of the Glass and Glazing Federation trade association.
Duration Windows Secondary
Glazing is a leading supplier of UPVC and aluminium doors and window
systems, including secondary glazing. It supplies Tilt Back Vertical Sliding
Secondary Windows, and Horizontal Sliding Secondary Windows. The Duration
Windows website contains an online Estimator for secondary glazing.
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