36
covered by the warranty of the glass supplier
and Idealcombi A/S.
Warm edge
Warm edge is a thermoplastic spacer that
minimises the thermal bridge at the edge
of the pane, thereby contributing directly to
reducing the window’s total heat loss. This is
not only good for the environment and your
heating bill, it also increases the tempera-
ture along the edge of the pane, thereby re-
ducing the risk of internal condensation for-
ming in the rim zone. Idealcombi uses warm
edge as standard on all units and the dark
spacer gives the window an attractive and
harmonious look.
The primary reason is that the heat transfer
from the interior to the exterior side of the
glazing unit is so low that the temperature
of the exterior surface becomes lower than
that of ordinary double glazing units. As
standard, IdealCombi A/S uses energy class
A glass with low emission coating and a U-
value of 1.2 You cannot prevent the physical
phenomenon "exterior condensation", but
you can make some safety precautions to
reduce the extent and inconveniences of it.
Thermal rupture of double glazing units
When constructing windows and mounting
the double glazing units in the sash, Ideal-
combi A/S makes allowance for the glass
to "work" as a natural part of temperature
fluctuations. If a double glazing unit is ex-
posed to uneven heat exposure it may cause
thermal rupture of the glass. Uneven heat
exposure can be caused by e.g. deep sha-
dows, adhesion of (especially dark coloured)
streamers, posters or signs, painting of the
glass or parts of it, or adhesion of plastic foil
or sun filters.
It can also be caused by placing heat-reflec-
ting materials close to the glass or if heavy
curtains, blinds or large plants obstruct pro-
per, even heating of the glass. Under such
conditions, double glazing units may absorb
so much solar energy that tensions in the
glass can cause a very characteristic rup-
ture.
To avoid thermal rupture under such conditi-
ons it is necessary to use pre-stressed glass
for the double glazing unit. Defects caused
by the above-mentioned conditions are not
Double-glazing | Warm edge
