Flat Roofing Systems 

Whether your need is for a single ply or built up roofing system, Ledegar Roofing Company has a team of commercial roofing experts that can help you determine the best solution for your building. Read the differences and benefits of each below, then contact us to find out why Ledegar's Details Make the Difference when choosing a contractor.

Single Ply Roofing

This type of roofing system is just that, a single ply of membrane. There are three different applications for single ply:


The application for a ballasted flat roof involves an initial loose laying of the membrane over the insulation, which is then flashed at all penetrations and around the perimeter. Once flashing is complete, the roof is covered in water worn round gravel, called ballast, to hold the membrane in place. The second application, adhered, uses an adhesive to bond the membrane to the insulation. The last application, mechanically attached, involves securing the membrane directly to the deck with screws and plates at the seams.


Built Up Roofing (Hot Tar)

This roofing system is simply a roof consisting of multiple layers of laminated roof felts fused together with bitumen. Built up roofs can be either gravel surfaced or smooth. A variant, called modified bitumen (MB), has a reinforced, top ply that can also be either smooth or granulated.
Built up roofs are the longest-lasting flat roof assemblies, with an average lifespan of 20 to 40+ years and are also far more durable than single ply roofs.

Though they have a higher initial cost compared to single ply, built up roofs typically have a lower total life cycle cost, making them an excellent choice for roofs that are high traffic, at risk of falling ice and need to be worry free and long lasting.

White coatings, or a white cap sheet on modified roofs can earn LEED Credits.

Learn more about Built Up Roofing and Modified Bitumen roofing options.