Top 5 Commercial Flat Roofing Systems for 2025
7 Min Read
POSTED 27.12.2024
When managing a commercial property, your roof is one of the most critical components to maintain. Commercial flat roofing offers property owners a durable and cost-effective solution that suits various business needs. This guide will explore everything you need to know about commercial flat roofing, including:
- What commercial flat roofs are and why they are popular
- The different types of commercial flat roofing systems
- How to maintain and extend the life of your commercial flat roof
Why Choose Commercial Flat Roofing?
Flat roofing systems are widely preferred by commercial property owners because of their practicality and durability. Unlike pitched roofs, flat roofs maximize usable space, making them ideal for HVAC systems, solar panels, or even rooftop gardens. More importantly, they are often more cost-effective to install and maintain compared to other types of roofing.
Signs Your Commercial Roof May Need to Be Replaced
Knowing when to replace your commercial roof can save you from costly repairs down the line. Look out for these warning signs:
- Persistent Leaks: If leaks keep occurring despite repairs, it may be time for a replacement.
- Visible Damage: Cracks, bubbles, or large areas of pooling water are red flags.
- Age of the Roof: Most flat roofs have a lifespan of 15-20 years. If yours is nearing this age, consider a professional inspection.
- Rising Energy Bills: A damaged roof can reduce insulation efficiency, leading to higher energy costs.
Addressing these issues early can ensure the safety and longevity of your commercial property.
5 Different Types of Commercial Flat Roofing Systems
When selecting a flat roofing system for your property, you’ll want to consider how long it lasts, its cost, and the maintenance required. Below are common types of systems:
1. Built-Up Roofs (BUR)
Built-up roofs are made of alternating layers of materials such as tar, asphalt, and gravel. Known for their durability, BUR systems are best for properties needing high levels of weather resistance. They can last up to 20–30 years with proper maintenance.
Average Cost: $4–$10 per square foot
Advantages:
- Excellent insulation
- Low maintenance
- Long-lasting durability
About the Materials:
- Asphalt and Gravel: The asphalt forms a waterproof membrane, while gravel protects it from UV rays and thermal cycling.
2. Modified Bitumen
This system uses asphalt combined with additional materials to improve roof flexibility. Modified bitumen is often installed in layers, offering enhanced protection.
Average Cost: $3–$7 per square foot
Advantages:
- Affordable and easy to install
- Resistant to extreme temperatures
- Simple repair process
About the Materials:
Asphalt, Fibers, and Mineral Granules: Asphalt mixed with modifiers like SBS or APP, reinforced with fiberglass or polyester, and topped with granules or reflective coating.
3. Single-Ply Membrane Systems
Single-ply membranes like TPO (Thermoplastic Polyolefin), EPDM (Ethylene Propylene Diene Monomer), or PVC (Polyvinyl Chloride) are lightweight and energy-efficient solutions. These are often the go-to choice for businesses focused on sustainability.
Average Cost: $4–$8 per square foot
Advantages:
- Highly energy-efficient
- Lightweight material minimizes structural stress
- Resistant to UV radiation
About the Different Single-Ply Materials:
- Thermoplastic Polyolefin (TPO): White, reflective, energy-efficient
- Ethylene Propylene Diene Monomer (EPDM): Black rubber, better for cold climates
- PVC Membrane: Highly durable and chemical-resistant
4. Spray Polyurethane Foam (SPF)
SPF Roofing is a liquid-applied system that expands to form a solid layer on your roof. It’s popular for its seamless application and energy efficiency.
Average Cost: $5–$8 per square foot
Advantages:
- Excellent insulation properties
- Seamless application prevents leaks
- Long service life with minimal repairs
About the Materials:
Spray Polyurethane Foam (SPF): Two chemicals—polyol resin and isocyanate—combine to form the foam, which bonds to most roofing materials.
5. Metal Roofing
Metal roofing systems are made from materials like aluminum, steel, or copper and are known for their strength and longevity. While less common for flat roofs, they are a durable and low-maintenance option for commercial properties.
Average Cost: $7–$12 per square foot
Advantages:
- Extremely durable and weather-resistant
- Long lifespan, often lasting 40 years or more
- Low maintenance and recyclable materials
About the Different Metal Roofing Materials:
- Aluminum: Rust-resistant, especially good for humid or coastal climates
- Steel: Durable and affordable
- Copper: High-end aesthetic, very long lifespan
- Zinc: Eco-friendly, develops a natural patina, self-healing
Types of Commercial Flat Roofing System Comparison Table
| Roofing Type | Avg. Cost (Per Sq. Ft.) | Lifespan | Best For | Pros | Cons |
|---|---|---|---|---|---|
| BUR (Built-Up Roof) | $4 – $10 | 20–30 years | Durable, high-traffic roofs | Great insulation, UV resistant, fire resistant | Heavy, time-consuming install |
| Modified Bitumen | $3 – $7 | 15–25 years | Budget-conscious property owners | Easy repairs, flexible, good temperature resistance | Less eco-friendly, can blister if improperly sealed |
| Single-Ply Membranes | $4 – $8 | 20–30 years | Energy-conscious or green buildings | Lightweight, UV-resistant, fast installation | Puncture-prone, varying quality based on material |
| SPF (Spray Foam) | $5 – $8 | 20–30 years | Custom shapes, seamless insulation | High R-value, seamless waterproofing, lightweight | Needs ideal weather during installation |
| Metal Roofing | $7 – $12 | 40–70+ years | Long-term durability, aesthetics | Extremely durable, low maintenance, recyclable | Higher upfront cost, not ideal for complex flat roofs |
Tips for Maintaining Commercial Flat Roofs
Proper maintenance can significantly extend the life of your investment. Follow these tips to keep your roof in excellent condition:
- Schedule Regular Inspections: Arrange for a professional to inspect your flat roof at least twice a year, ideally in spring and fall. Inspections after severe weather events, like storms or heavy snow, can catch damage early before it worsens.
- Clean Debris: Clear leaves, branches, and other debris from your roof regularly. When left unattended, debris can clog drains and lead to standing water, which can damage the roof surface over time.
- Make Minor Repairs Promptly: Small tears, cracks, or punctures may seem minor, but they can quickly escalate into costly repairs if ignored. Addressing these issues early can save both time and money in the long run.
- Check Drainage Systems: Ensure gutters and drains are functioning properly and free from blockages. Poor drainage can cause water to pool on the roof, leading to structural damage or leaks.
Expert Commercial Flat Roofing Services
At Badgerland Exteriors, we pride ourselves on delivering expert craftsmanship and exceptional customer service for all your commercial flat roofing needs. Our experienced team uses high-quality materials and proven techniques to ensure your roof is durable, efficient, and built to last. We understand the importance of protecting your investment and work closely with you to provide tailored solutions that meet your specific requirements.
Trust us to handle your project with care, professionalism, and attention to detail every step of the way. Contact Badgerland Exteriors today for a free consultation—your trusted partner in commercial roofing excellence!
What is the most common commercial roofing?
The most common commercial roofing system today is TPO (Thermoplastic Polyolefin). It’s widely used because of its affordability, energy efficiency, and ease of installation. Its white reflective surface helps reduce cooling costs, making it especially popular in warmer regions.
Is EPDM better than TPO?
It depends on your building’s needs.
EPDM (black rubber) is better for cold climates because it absorbs heat and performs well in freezing temperatures.
TPO (white membrane) is better for hot climates because it reflects sunlight and reduces cooling costs.
Both offer excellent durability, but TPO tends to be more energy-efficient, while EPDM is often easier to install and repair.
What is the longest lasting commercial flat roof?
Metal roofing systems (especially copper or zinc) offer the longest lifespan, often lasting 40 to 80 years with proper maintenance.
For non-metal flat roofs, PVC and EPDM membranes typically last 25–30 years and sometimes longer when properly installed and maintained.
What’s the best roofing system for Wisconsin weather?
EPDM and Modified Bitumen perform well in Wisconsin due to their resistance to freeze-thaw cycles and snow loads. Metal roofs are also excellent because they shed snow easily—just ensure snow guards are installed.
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Got a question? Want to learn more about your options when it comes to caring for your home exterior? Our team is standing by with the information you need to start you roof replacement project today!
