What type of roofing consists of a single layer, such as SBS or EPDM?

Single Ply Roofing refers to a type of roofing system that incorporates a single layer of membrane material, such as Styrene-Butadiene-Styrene (SBS) or Ethylene Propylene Diene Monomer (EPDM). These materials are known for their durability, flexibility, and resistance to environmental factors. The single-ply configuration allows for ease of installation, as well as maintenance, offering a lightweight solution compared to traditional built-up roofing systems that involve multiple layers.

The characteristics of single-ply roofs include their ability to be mechanically attached, ballasted, or adhered, providing versatility for various applications and building types. They also demand less material and labor than multi-layer systems, contributing to cost-effectiveness. Moreover, the inherent properties of materials like SBS and EPDM make single-ply roofing particularly effective in a range of climates, supporting energy efficiency and longevity.

In contrast, built-up roofing involves multiple layers of materials such as bitumen and fabric, while flat roofing is a general term that describes the roof's slope rather than the materials used. Layered roofing suggests multiple layers, which distinguishes it from single-ply systems. Thus, Single Ply Roofing stands out as the correct answer given its specific definition and application in roofing technologies.