Roofing

Performance of Tubular Daylighting Devices

Tubular daylighting devices (TDDs) can economically admit natural light into areas of buildings that do not have windows or skylights. This Update outlines the features and characteristics of TDDs and presents research findings that will improve the ability of manufacturers to design and rate their products. It will also help specifiers select best-performing products for particular locations and installation geometries. Full story