Polycarbonate Clerestories Daylighting Curtain Walls: Custom built polycarbonate curtain or window walls are a wise wise choice, for the builder. The Sundance Supply approach is a Multiwall Lexan Polycarbonate sheet and the Base & Cap Installation System. The customer provides the frame and remaining building components, for a custom wall system. Together this approach provides a watertight, attractive and long life solution. – Also See 40mm Thermoclick 4.47 r-value.
8-25mm Poly Install with Base & Cap System
Strong poly, less framing – 25mm or 16 X-Wall
Warehouse Window Install – Base & Cap System 
Contractor Base & Cap Site – No mention of Sundance Supply, a great sales tool