Fiberglass is awesome.
All of our products feature fiberglass frames, because fiberglass windows and doors have many life-cycle performance advantages over traditional framing materials.

Why Cascadia’s Fiberglass?
- It is almost 10 times stronger than vinyl/PVC, and has a similar strength to Aluminum, so can achieve large spans and be used in commercial applications.
- It is 8 times more stable from expansion and contraction than PVC, and therefore, does not cause stress on the joints, seals, and gaskets - meaning your window stays leak-free longer
- It is approximately double the thermal performance of aluminum, sometimes even better than double
- It is not susceptible to decay, mildew, UV degradation, or corrosion, which makes it is ideal for all climates and exposures.
- It has at least double the life span of PVC - the expected life span of fiberglass is 50+ years
See the expanders below for much more information on the many benefits of fiberglass.