Available ranges

Our box windows are available in the following product ranges, based on frame material:
uPVC Box Window
uPVC

Insulation performance

Whole window insulation performance (Rw Value) is shown below – not just the glass or frames by themselves like our competitors. A high number means better insulation.
0.63 Rw
Our uPVC windows with low-E & argon
0.59 Rw
Our All Wood windows with low-E & argon
0.57 Rw
Our Clad Wood & H3 Fusion™ windows with low-E & argon
0.50 Rw
Thermally broken aluminium with low-E & argon
0.50 Rw
New Building Code (Climate Zones 5–6)
0.46 Rw
New Building Code (Climate Zones 1–4)
R values for products sold by Ameribuild represent whole window (Rw) values, not just the glass or frames by themselves, based on metric NFRC testing data. European testing methods may yield different results. Other data sourced from publicly available sources, including MBIE and BRANZ. All data was correct at the time of publication.