Consider the choice of glazing carefully. The two types of glazing commonly used in residential skylights are plastic and glass. While, plastic glazings are usually inexpensive and less liable to break than most other glazing materials, their surfaces scratch easily and they may become brittle and discolored over time. This increases fading damage to furnishings. Acrylics and polycarbonates are the most commonly used plastic glazings.
Acrylics are weaker than polycarbonates, but cost less.
Although polycarbonates offer high impact resistance, some yellow with age. Glass is usually found on the more expensive skylights. Glass is much harder and durable than plastics and does not discolor. This is a generic term for both tempered and laminated glass. Tempered glass is the most impact resistant.