Is a ModBit Roof the Best Option for Your Commercial Building in 2025? 

If you’re managing or owning a commercial property, you may be wondering: is a modified bitumen (modbit) roof still the best choice? It’s a fair question—especially when you’re comparing it to newer systems like TPO, PVC, or EPDM. At Weather Shield Roofing Systems, we’ve been helping businesses navigate these roofing decisions for over 40 years. We know how confusing it can get with so many options and so many opinions. 

Let’s walk through it together so you can make the most informed choice. 

Why Were Modbit Roofs So Popular?

Modbit roofs gained popularity decades ago because they were affordable and relatively simple to install at the time. Many property owners liked them because they offered a budget-friendly solution to cover large commercial roofs. 

But with today’s advances in roofing materials and installation techniques, the landscape has changed. 

Are Modbit Roofs Still Cost-Effective?

While a modbit roof might seem inexpensive upfront, it often ends up costing more over time. Why? It comes down to labor, maintenance, and longevity. 

Think about this: modbit roofs have seams every three feet or so. That means a lot of seams to maintain—and seams are one of the first places to develop problems. Every extra seam means extra labor during installation and extra effort to maintain the roof over the years. 

Compare that to TPO, PVC, or EPDM roofs, which have fewer seams. TPO and PVC systems use hot-air welding to fuse seams, creating a watertight barrier that’s far easier to maintain. EPDM roofs, on the other hand, are glued or adhered, also reducing seam-related issues. 

Simply put, with fewer seams and advanced installation methods, TPO, PVC, and EPDM roofs are easier to service and maintain. Over time, they tend to last longer and cost less than modbit roofs. 

How Do Modbit Roofs Handle UV and Weather?

Another drawback of modbit is how the material responds to the elements. UV rays can degrade modbit compounds, causing the material to wear down faster. In winter climates, modbit roofs can get brittle, and seams are prone to cracking or coming apart. 

In contrast, modern materials like TPO and PVC resist UV damage far better. They remain flexible through temperature swings, providing longer-lasting protection. 

Do Color and Heat Reflectivity Matter?

Absolutely. Most modbit and EPDM roofs are darker in color, meaning they absorb heat. On a hot summer day, that can significantly increase your building’s interior temperatures—and your energy costs. 

Meanwhile, TPO and PVC roofs usually come in white or light colors. These reflect heat and UV rays, helping keep your building cooler and reducing air conditioning expenses. With energy efficiency being top-of-mind for many businesses today, this is a major reason why TPO and PVC are becoming more popular choices. 

What Confuses People Most About Choosing the Right Roof?

One of the biggest frustrations for property managers and owners is not knowing which system fits their building best. 

You might call three different contractors for quotes and get three very different recommendations—one says TPO, another says EPDM, a third still suggests modbit. Without clear guidance, it’s hard to feel confident in your decision. 

That’s where we come in. At Weather Shield Roofing Systems, we act as trusted advisors. We take time to understand your specific building use, roof structure, climate, and long-term needs. For example: 

If your property has grease exhaust or a kitchen with deep fryers, TPO or PVC is typically better than EPDM because it handles oils better. 

If your roof is heavily shaded and you don’t have heat issues, color reflectivity might not matter as much. 

If your goal is minimal maintenance and maximum longevity, seamless or hot-air welded systems are often the way to go. 

Key Takeaways About Modbit Roofs

Even though modbit might seem inexpensive to install, the ongoing maintenance and shorter lifespan often make it more expensive over the long haul. 

With newer systems like TPO, PVC, and EPDM, you can get a better-performing roof, lower maintenance needs, and more cost-effective results over the life of the roof. 

For many commercial buildings today, these modern options simply make more sense. 

At Weather Shield Roofing Systems, our goal is to help you protect your roofing investment with smart, long-lasting solutions. If you’re evaluating options or unsure what system is right for your building, our team is here to help. Reach out to us anytime and we’ll be happy to guide you. 

Related blogs:

🔗 What is TPO Roofing?

🔗 What’s the Difference Between a White Roof and a Black Roof?

🔗 What is a Membrane Roof?