Single-Ply roofing systems are composed of insulation, a single ply membrane, flashings, and adhesive. Single-Ply is lightweight, consisting of a single layer of roofing over insulation. This makes them a great choice for retrofits. TPO, EPDM, and PVC are the three most common types of single-ply membrane systems.

ThermoPlastic Olefin (TPO) advantages include:

• Long-term durability of rubber
• Security of hot air welded seams
• Most environmentally friendly of the single-ply systems
• No dioxins or chlorine produced
• Membranes come in varying thicknesses and roll widths to meet specific requirements

Ethlyene Propylene Diene Terpolymer (EPDM) advantages include:

• Technology proven effective for more than three decades
• Expands and contracts with the building
• Minimal maintenance
• Withstands extreme temperatures
• Resistant to UV radiation and ozone

Polyvinyl Chloride (PVC) advantages include:

• Among the easist of the single-plys to install and heat-weld together
• Resistance to various chemical effluents
• Superior resistance to punctures and tears
• Able to withstand exposure to concentrations of grease, oils and various fuels
• Preferred solution where acid rain or other acidic outflow is present