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.