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Insulated glass units (IGU’s) or double
glazed units are a significantly more energy efficient glazing
system than single glazed windows. It is estimated that up to *0%
of heat entering the home and up to *0% of winter heat loss is a
result from the use of single glazing. IGU’s consist of two or more
panels of glass separated by airspace and aluminium or other type
of spacer around the edges, sealed to the perimeter in controlled
conditions. The spacer contains a desiccant (drying agent) which
eliminates moisture vapour in the cavity. The combination of the
two panels of glass and the trapped air is what makes IGU’s a
superior energy efficient method of glazing.
The glazing system must be designed to drain out all water in the
rebate and a void must exist under the unit so that moisture is not
trapped against the edge of the glass.
Generally units should be glazed with a minimum 3mm clearance
between the glass face to rebate a minimum 3 - 6mm clearance under
the unit in the rebate (size of block) and a minimum *2mm cover or
bite in the rebate.
Dry glazing of units is always recommended but if units are to be
glazed or bedded into compounds or sealants it is imperative that
compatible sealants are used or edge failure may result.
CONDENSATION
Water from condensation build-up and resultant water run-off can
damage window frames/sills and seep into walls and adjoining areas.
Condensation will form when the moisture in the air condenses out
on surfaces that are cooler than the ‘dew’ point. Insulated walls,
ceilings and floors provide better thermal barriers than windows.
Window surfaces being colder than other surfaces in the home or
building are more prone to condensation build up. An IGU reduces
the likelihood of condensation forming by providing a thermal
barrier between the inside and the outside.
THERMAL STRESS
The use of solar control glass (tinted floats or reflectives) may
affect the thermal safety of the glazing unit. Careful
consideration needs to be given to building design, frame type,
glazing methods, proximity of blinds, screens or curtains and
external shading. Refer Thermal Breakage.
Country: | India |
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FOB Price: | Get Latest Price |
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