Single Ply

A single-ply roof is a roofing membrane that is applied directly to the roof substrate. Unlike built-up roofs, they don’t require multiple layers of material, making them faster to install.

The manufacturers provide labor and material warranties for up to 30 years, but professionally installed systems that are maintained well have been know to perform even longer.

However, if the roof is exposed to frequent traffic, high density coverboards under the membrane or walkway pads are recommended for better protection.

One of the values of a single-ply roof is how easily it can be repaired. The type of repair depends on the type of roof and the extent of the damage, but single-ply roofs can be patched with like materials that are heat-welded, chemically-bonded or taped to restore their waterproof properties.

The thickness of a single-ply roof depends on the material type chosen, but it typically ranges from between 45 mils (1.14 mm) and 90 mils (2.29 mm). Common thicknesses are 45, 60, and 80 mils.

Single-ply membranes can be installed on vertical walls. For higher walls and roofs with a 4:12 pitch or greater, additional securement methods are required to ensure they're safe, long-lasting and maintain their watertight properties.

Maintaining a single-ply roof requires regular inspections, cleaning debris and any films or chemicals on the surface, making small repairs on penetrations and seams, and ensuring there isn’t any excessive ponding.

Single-ply roofs are installed by rolling out long strips of EPDM, TPO, PVC, or other materials across the roof. The seams between the strips are either chemically adhered with tapes, adhesives or heat-welded together to create one watertight membrane.