NRP has several different commercial roof types available. Our contractors will assess the condition of your roof and recommend the best available solution to fit your budget.
TPOThermoplastic Olefin (TPO) is highly resistant to UV rays and is becoming increasingly common in roofing, especially in warmer climates. It may be applied on low-slope or steep-slope roofs, and can even have strips applied which give it the appearance of a standing-seam metal roof at a lower cost than metal. TPO is available in a wide variety of colors, including highly-reflective light colors eligible for LEED® points and Energy Star® credits.
PVCPolyvinyl Chloride (PVC) roof membrane consists of two layers of PVC with a reinforcing scrim sandwiched in the middle. Like TPO, PVC roofs are installed with heat-welded seams which make them exceptionally watertight; however PVC membrane has the ability to withstand harsh chemicals.
EPDMEthylene Propylene Diene Monomer (EPDM) is a rubber single-ply roof membrane traditionally black in color, although white EPDM is available. It is resistant to temperature extremes, and exhibits the least brittleness of the common single-ply membranes in freezing temperatures.
Modified BitumenModified Bitumen (Mod Bit) roofing is the next generation of the tried-and-true built-up roof. Typically comprised of 2-3 plies of asphaltic felts, they can be torch-applied or installed with cold adhesive. Mod bit roofs typically have a granule-surface cap sheet and are available in a variety of colors. Some manufacturers have modified cap sheets with enough solar reflectivity to meet LEED requirements.
Built-upBuilt-up roofing (BUR) systems typically consist of 3-4 plies of fiberglass felts applied over insulation or other materials embedded in hot steep asphalt or cold asphalt adhesive in a multi-ply configuration. Gravel applied over a BUR system serves two purposes: first to protect the membrane from ultraviolet rays and second, to act as a ballast to hold the roof in place. BUR systems are typically one of the least expensive roofing options due to their durability and speed of application, especially in large, new construction scenarios. On the downside, hot asphalt produces a strong aromatic odor during application, which may disturb building occupants &/or neighbors.
MetalStanding Seam metal roofs are a traditional and attractive roofing system suitable for a variety of applications and climates. They are typically installed on roofs with greater than 2” on 12” slopes and come in a variety of baked on colors (Kynar Finished) or natural metals like copper & zinc. Exposed fastener metal panel roofs like R-panels & M-panels are very prevalent in industrial complexes as well as metal building packages. Many of NRP's partners have full sheet metal shops where the aforementioned metal systems and accessory components are fabricated. Many of these shops are also ANSI SPRI ES1 approved for shop fabrication for the most demanding projects.
CoatingsA roof coating is a monolithic, fully adhered, fluid-applied roofing membrane. It has elastic properties that allow it to stretch and return to its original shape without damage. Typical roof coating dry film thickness vary from paint film thickness (plus or minus 3 dry mils) to more than 40 dry mils. This means a roof coating actually becomes the top layer of a composite roof membrane and underlying system. As such, the roof coating is the topmost layer of protection for the membrane, receiving the impact of sunlight (both infrared and ultraviolet (UV), rain, hail and physical damage.