GLASS SELECTION GUIDE - Eboss

COMFORT
Comfort for occupants is a key factor for modern housing design.
When it is cold outside there are cold zones near windows know as “discomfort zones” and these
are more severe if the glazing is not insulated.
Insulating Glass Units improve the insulation and thus reduce the discomfort zones near windows
because the inner glass surface is much warmer than for single glazing.
GOOD
Clear glass
INNER
Clear glass
OUTER
Solution:
GlassTech IGU
Is GOOD because it meets the
minimum requirements for thermal
insulation for housing and small buildings
(NZS 4218) and keeps the inside glass
surface warmer than single glazing and
thus increasing the comfort zone.
BETTER
Low E glass
INNER
Clear glass
OUTER
Solution:
GlassTech Low E + IGU
Low E glass provides BETTER thermal
insulation as it traps heat inside by
reflecting long wave radiation and
keeping the inner glass warmer, further
increasing the comfort zone.
BEST
Low E glass
INNER
Argon gas
Clear glass
OUTER
Solution:
GlassTech Low E + and Argon + IGU
By combining Low E glass and argon gas
the BEST thermal insulation is achieved and
the inner glass is at it’s warmest, providing
the largest comfort zone.
Thermal spacers can be used in thermally
efficient frames to improve the total window
performance, thus increasing the comfort
zone.
PERFORMANCE DATA – Refer to Metro GlassTech Catalogue and
Reference Guide Section 11.2.3.
The Good, Better, Best approach is a simplification of the complexity surrounding the selection of the
correct glass to provide the best design solution, and therefore other options, not listed on this sheet, are
available from Metro GlassTech. In addition other factors can affect the glass selection such as the risk
of thermal stress breakage and the requirements to comply with the NZ Building Code and NZS 4223.
www.metroglasstech.co.nz
April 2013