Table of Contents

Key Takeaways

Every roofing system has its strengths and weaknesses, and what works for one building might not be the best fit for another. Let’s break down the pros and cons of the most common commercial roofing systems so you can make an informed decision.

Built-Up Roofing (BUR) Systems

Built-up roofing, or BUR, is one of the oldest commercial roofing methods. It’s made by layering asphalt, tar, and gravel to create a thick, durable barrier against the elements. As a flat roofing system, BUR is commonly used on commercial buildings, but it’s important to weigh the benefits of flat vs. pitched roofs to determine which best suits your property.

✅ Pros:

  • With multiple layers, BUR provides excellent waterproofing and protection against the elements.
  • It holds up well to UV exposure and foot traffic.
  • Low maintenance compared to some newer systems.

❌ Cons:

  • It’s heavy, so your building needs strong structural support.
  • Installation takes longer due to the multiple layers.
  • Higher upfront costs compared to single-ply roofing.

If durability and longevity are priorities, BUR is a solid option. But if your building can’t support the weight or you need something faster to install, the other systems listed below might be better option.

Single-Ply Roofing (TPO, PVC, EPDM)

Single-ply membranes like TPO roofing, PVC, and EPDM are some of the most popular commercial roofing choices today. They’re lightweight, flexible, and designed for energy efficiency.

✅ Pros:

  • Quick and easy to install, saving time and labor costs.
  • TPO and PVC are highly reflective, reducing cooling costs.
  • EPDM is incredibly flexible, making it great for areas with extreme temperature swings.

❌ Cons:

  • These membranes can be punctured more easily than multi-layer systems.
  • Over time, seams may weaken and lead to leaks.
  • Not as impact-resistant as thicker roofing systems.

If you’re looking for a cost-effective, energy-efficient roof that’s easy to install, single-ply roofing is a great option. Just make sure to keep an eye on those seams over time.

Metal Roofing

Metal roofing is known for its long lifespan and ability to handle extreme weather. It’s often made from steel, aluminum, or copper and comes in standing seam or corrugated panel designs.

✅ Pros:

  • Durability—metal roofs can last 40+ years with proper maintenance.
  • Weather-resistant—great for areas with strong winds or heavy snowfall.
  • Energy-efficient—reflective coatings help lower cooling costs.

❌ Cons:

  • Higher initial cost compared to traditional roofing materials.
  • Can be noisy during rain or hailstorms if not insulated properly.
  • Expands and contracts with temperature changes, which can loosen fasteners over time.

If longevity and weather resistance are your priorities, a metal roof is a fantastic investment—just be prepared for a higher upfront cost.

Modified Bitumen Roofing (Modbit) 

Modified bitumen is similar to built-up roofing but with added flexibility. It’s reinforced with fiberglass or polyester and can be installed in layers using adhesives, heat, or self-adhering sheets.

✅ Pros:

  • Holds up well to foot traffic and impact damage.
  • Excellent waterproofing when properly installed.
  • Can be applied in multiple ways, depending on your needs.

❌ Cons:

  • Can degrade under constant UV exposure if not coated.
  • Installation can be labor-intensive.
  • Becomes brittle over time, especially in fluctuating temperatures.

If you need a tough, waterproof roof for a high-traffic area, modified bitumen is worth considering—just make sure it’s installed correctly to prevent premature wear.

Green (Vegetative) Roofing Systems

Green roofs are exactly what they sound like—a roof covered with plants and vegetation. These eco-friendly systems are gaining popularity in urban areas due to their environmental benefits.

✅ Pros:

  • Provides natural insulation, reducing energy costs by acting as a cool roof.
  • Helps manage stormwater by absorbing rainwater.
  • Extends the lifespan of the roof membrane by protecting it from the elements.

❌ Cons:

  • Expensive to install and maintain.
  • Requires additional structural support due to added weight.
  • Needs a well-designed drainage system to prevent water buildup.

If sustainability is a priority and you have the budget for it, a green roof can be a great long-term investment that benefits both your building and the environment.

Spray Polyurethane Foam (SPF) Roofing

SPF roofing is a seamless, spray-applied system that expands into a durable foam layer. It provides insulation and waterproofing in one application.

✅ Pros:

  • Seamless application prevents leaks and water infiltration.
  • High insulation value, reducing heating and cooling costs.
  • Can be applied over an existing roof, cutting down on removal costs.

❌ Cons:

  • Needs to be installed under specific weather conditions for proper adhesion.
  • Susceptible to UV damage unless protected with a top coating.
  • Requires regular inspections to maintain its effectiveness.

If you’re looking for a roofing solution that provides both insulation and waterproofing, SPF is a great choice—just make sure it’s applied under the right conditions.

Finding the Right Commercial Roof for Your Building

There’s no perfect roofing system for every building—it all comes down to what works best for your budget, climate, and long-term needs. If durability is your priority, metal or BUR roofing might be the way to go, while single-ply options like TPO and PVC offer a more affordable, energy-efficient solution. Looking for something eco-friendly? A green roof can boost insulation and help with stormwater management. No matter what you choose, regular maintenance and inspections will keep your roof in good shape for years to come, and if you’re unsure which option fits your building best, a commercial roofing contractor can help you make the right call.