Commercial Roofing Systems

EPDM (Ethylene Propylene Diene Terpolymer):

A synthetic rubber membrane commonly used on low-slope flat roofs. EPDM is valued for its flexibility, durability, resistance to weather and UV damage, and long lifespan—often lasting over 30 years. It’s lightweight, waterproof, and typically more cost-effective than other single-ply systems. While most EPDM membranes are black, white, gray, and tan options are also available. Black membranes absorb more heat, making them less energy-efficient than lighter-colored versions. EPDM does have drawbacks: it can shrink over time and is more prone to punctures compared to some alternatives

PVC and TPO Single-Ply Membranes:

PVC and TPO are popular white, heat-welded thermoplastic roofing systems commonly used on commercial flat roofs. They look nearly identical, but their properties differ significantly.

• PVC (Polyvinyl Chloride):
  PVC roofs typically last around 20 years. They offer strong resistance to water, fire, and wind, but tend to cost more and aren’t as puncture-resistant as EPDM or TPO.
  
  
• TPO (Thermoplastic Polyolefin):
  TPO is more affordable, easier to install, and can last 10 to 25 years. However, it's a newer material—introduced in the early 1990s—so its long-term performance isn't fully known. 
  

Modified Bitumen:

An asphalt-based material with enhanced flexibility and durability, suitable for flat and low-slope roofs. Modified bitumen (mod bit) is a type of asphalt-based flat roofing enhanced with polymers for added flexibility and strength. It comes in rolled sheets with either a smooth or granulated finish and can be applied using heat, adhesives, or peel-and-stick methods.Mod bit roofs typically last 15 to 20 years and cost more than some other commercial flat roof options. They're known for being tough and energy-efficient, handling extreme temperatures well and helping to reduce heat transfer. The main downside is the shorter lifespan compared to other systems. Also, pinpointing leaks can be challenging with this material.

Built-Up Roofing (BUR):

A traditional, multi-layered system using asphalt-impregnated felt and bitumen, often topped with a layer of aggregate. Built-up roofing (BUR) has been a staple in commercial and industrial buildings for over a century. It’s made by layering asphalt (bitumen) with reinforcing ply sheets, then topping it off with gravel, slag, or mineral granules.BUR systems usually last between 15 and 30 years. They offer solid UV protection, strong waterproofing, and low maintenance needs. The gravel or mineral surface also adds fire resistance and improves appearance. However, BUR installations are more costly and time-consuming than other flat roofing options. They're also more vulnerable to damage from wind and standing water.

Standing Seam Metal:

Standing seam metal roofing is a high-performance option for commercial flat and low-slope roofs. It uses long metal panels joined by raised seams that lock together, hiding fasteners and creating a clean, watertight finish. Known for its durability, a standing seam roof can last 40 to 70 years with minimal maintenance. It’s also energy-efficient—many systems use reflective coatings or light colors to reduce heat gain and cut cooling costs. The panels are resistant to fire, wind, water, and hail, making them a reliable choice for harsh environments. Standing seam metal roofs are ideal for commercial buildings seeking long-term value, low maintenance, and strong energy performance.

Spray Polyurethane Foam (SPF) Roofing:

Though less common than other flat roofing options, spray polyurethane foam (SPF) is one of the most effective systems available. It combines closed-cell foam insulation with a protective elastomeric coating. When properly maintained, an SPF roof can last over 50 years. It offers excellent thermal resistance and energy efficiency, making it a strong insulator for low-slope roofs. SPF also boosts the structural strength of commercial buildings. However, installation is complex. It requires skilled contractors, a narrow application window, and careful handling to avoid issues like overspray. Quality depends heavily on the installer’s experience.