What is a true statement regarding the installation of purlins?

The statement that purlins must be continuous and supported is accurate because purlins play a critical structural role in a roofing system. They serve as horizontal support beams that transfer the load from the roof deck to the vertical supports, such as rafters or walls. For the integrity of the roof structure, it is essential that purlins are properly supported at regular intervals and maintain continuity. This ensures that they can adequately handle the weight of the roofing materials and any additional loads, such as snow or equipment, without compromising structural stability.

A continuous and supported installation of purlins contributes to an overall stronger roofing system and allows for the effective distribution of loads. If purlins were allowed to be placed randomly without support, it could lead to structural weaknesses, potential sagging, or failure under load. As such, maintaining proper support and continuity is a fundamental principle in roofing construction.