Temperature extremes: Stability is beautiful

Shockingly cold winters, blistering hot summers or somewhere in between?


While traditional window framing materials are dimensionally stable on the shop floor, how they perform in the real world during extremes of humidity, heat and cold is quite a different story. With metal-clad wood, PVC and aluminum frames, the varying expansion rates between the glass and frame can result in stressed frames, air leakage, broken glazing seals, condensation and inoperable hardware. With fiberglass, the window glass and frame materials are the same, allowing the window glass and frame to expand and contract at the virtually same rate.

For example, extensive cold chamber testing by Natural Resources Canada has shown how window framing materials perform in real world conditions.
The results show that PVC operable windows, although well weather-stripped, suffer massive air leakage under simulated cold weather conditions. It has long been known that wood is prone to warping, shrinking and deterioration. Even aluminum has a coefficient of expansion that is twice that of glass. Aluminum frames must incorporate non-metallic thermal breaks in order to provide even a minimal degree of insulation.

Fiberglass expands at virtually the same rate as glass. Wherever you live, in any environmental condition, you’ll know that your Accurate Dorwin windows can handle Mother Nature’s extremes.