Building Science

Installation of GAF Single-Ply Roofing Assembly

Understanding the Layers of a Single-Ply Roofing Assembly

Single-ply roof membranes are a common choice for commercial low-slope roofing projects due to its durability, reflectivity, and ease of installation. The membrane is the top of a multi-layer assembly designed to help protect the building from the exterior elements. The layers of a roof assembly must all work together with two main goals: help keep the interior separate from the exterior (i.e. block the movement of water, air and heat between inside and out) and stay in place through expected weather conditions.

November 10, 2025