Glass

Some of the more commonly specified formats used in First windows and doors are detailed here. Glass choice is often a balancing act between responding in the best way to sound, light, heat and UV control. 

Double-glazing
Double-glazing offers good sound dampening qualities but more important are its thermal advantages. In summer double-glazing reduces heat and UV entry. In winter it provides good light and reduces outward heat loss. 

Safety glass
All First Windows & Doors products are supplied with glass that complies with NZS 4223, the glazing standard cited as an acceptable solution in the New Zealand Building Code.

The decision in glass selection is usually one of balance between light, heat and fading control from UV. The greater the light transmission, the less heat and fading are controlled.

Glass Clear Glass

4mm clear

Clear float glass is transparent and offers high visible light transmittance. As such most UV light and solar heat passes through it. Economical but has a high heat loss in winter.

G Clear glass