Selecting a roofing system for your commercial property is a significant decision. The roof not only protects your building from weather and environmental hazards, but it also plays a major role in energy efficiency, operational costs, and long-term value. Choosing the right commercial roof involves more than picking a material—it means evaluating your building’s structure, local climate, budget, and maintenance capacity.
At Shelter Roofing & Solar, we’ve worked with businesses across Southern California for over 40 years. Our team understands the complexity of commercial roofing and the importance of making the right choice the first time. In this guide, we’ll break down the most popular commercial roofing systems, highlight their pros and cons, and help you make an informed decision that aligns with your needs and long-term goals.
Key Considerations for Commercial Roofing
Before diving into material options, it’s essential to understand the critical factors that impact commercial roof selection. The right roofing system for one facility might not be ideal for another.
1. Building Size and Roof Slope
Most commercial buildings have flat or low-slope roofs, which require systems that can manage drainage and resist ponding water. Roof slope will heavily influence the type of material best suited for your building.
2. Climate and Environmental Conditions
In California, especially in areas like Ventura and Los Angeles Counties, roofing materials need to withstand prolonged sun exposure, high temperatures, and the occasional storm. UV resistance, thermal performance, and water protection all matter.
3. Energy Efficiency Requirements
With California’s Title 24 energy efficiency standards, many commercial buildings are required to have cool roofs or reflective materials that reduce heat absorption and lower HVAC costs.
4. Budget and Lifecycle Costs
It’s important to evaluate not only the upfront cost of installation but also the lifespan, required maintenance, and potential repair or replacement costs down the road.
5. Local Building Codes and Permit Requirements
Each city may have its own set of roofing regulations. Choosing a licensed and experienced contractor ensures your project meets all local codes and permitting guidelines.
Top Commercial Roofing Options and How to Choose
Let’s take a closer look at the most common commercial roofing systems available and explore how they align with different needs.
Built-Up Roofing (BUR)
Built-up roofing is one of the oldest and most proven commercial systems. It consists of multiple layers (plies) of bitumen and reinforcing fabrics, finished with a protective top layer like gravel or a cap sheet.
Pros:
- Excellent waterproofing
- UV and fire-resistant
- Great for flat or low-slope roofs
Cons:
- Heavier than other systems
- Labor-intensive to install
- Can become brittle over time
BUR is ideal for large, flat buildings that prioritize durability and weather resistance.
Modified Bitumen Roofing
Modified bitumen roofing is a modernized version of BUR, typically using a two-ply system with polymer-modified asphalt for enhanced flexibility and performance.
Pros:
- Better flexibility in temperature extremes
- Easy to install and repair
- Long-lasting with proper maintenance
Cons:
- May require heat applications during installation
- Can be punctured by foot traffic or heavy equipment
This system is a solid choice for commercial buildings in areas with fluctuating temperatures, including the hot daytime conditions in Southern California.
Thermoplastic Polyolefin (TPO) Roofing
TPO roofing is one of the fastest-growing commercial roofing types. It’s a single-ply membrane system known for its energy efficiency and heat-reflective properties.
Pros:
- White reflective surface meets California cool roof codes
- Lightweight and resistant to UV, chemicals, and punctures
- Ideal for reducing cooling loads
Cons:
- Performance varies by manufacturer
- Requires professional installation to ensure seam integrity
TPO is an excellent choice for property owners looking to lower cooling costs and meet energy efficiency standards. The U.S. Department of Energy promotes cool roofing materials like TPO for their ability to improve indoor comfort and reduce urban heat island effects.
Ethylene Propylene Diene Monomer (EPDM) Roofing
EPDM is a synthetic rubber membrane widely used for commercial flat roofs. Known for its strength and weather resistance, EPDM is a reliable and cost-effective option.
Pros:
- Long lifespan (20–30+ years)
- Excellent resistance to UV and ozone
- Low maintenance and relatively easy to repair
Cons:
- Black surface absorbs heat unless white coating is added
- Less puncture-resistant than TPO
EPDM is great for buildings seeking low maintenance and long-term performance, especially when paired with reflective coatings for heat resistance.
PVC Roofing (Polyvinyl Chloride)
PVC roofing is another type of single-ply system, similar to TPO, but with added chemical resistance and seam strength due to heat-welded seams.
Pros:
- Superior resistance to chemicals and grease (ideal for restaurants)
- Reflective surface reduces energy costs
- Durable in a wide range of climates
Cons:
- Higher upfront cost
- Can become brittle with age
PVC is well-suited for buildings with exposure to chemicals, oils, or high foot traffic—such as commercial kitchens or industrial facilities.
Metal Roofing for Commercial Buildings
Standing seam metal roofs and coated steel systems are also popular in commercial applications, particularly for structures that value durability and modern aesthetics.
Pros:
- Extremely long lifespan (40–60 years)
- Fire-resistant and low maintenance
- Reflective coatings available for energy savings
Cons:
- Higher upfront installation cost
- Can be noisy in rain or hail unless properly insulated
Metal is a premium option for businesses that want a sleek look, minimal upkeep, and long-term performance.
Green Roofing and Solar Integration
Some commercial properties opt for green roofing systems (vegetative layers installed over waterproof membranes) or solar roof integration, which can be installed with flat or sloped roofing systems.
Benefits of Green or Solar Roofing:
- Improved insulation and stormwater management
- LEED credits and sustainability branding
- Long-term energy savings with solar panels
For commercial buildings prioritizing environmental goals or looking to reduce utility expenses over the long haul, combining a durable roofing system with solar roofing solutions is a forward-thinking investment.
Ask the Right Questions Before You Commit
Before selecting your roofing system, ask your commercial roofing contractor:
- What is the expected lifespan and maintenance requirement?
- How well does this system perform in Pomona’s or Thousand Oaks’ climate?
- Can this roof accommodate future solar upgrades?
- What warranty options are included?
- How will this system impact my building’s energy efficiency and operational costs?
For more insight on how to vet your commercial roofing contractor, check out our blog on questions to ask your commercial roofer.
Choose a Roof That Supports Your Business Long-Term
The right commercial roof is more than just a layer of protection—it’s a financial asset. It safeguards your operations, reduces long-term costs, and boosts your property’s value and performance.
At Shelter Roofing & Solar, we understand that every commercial property is unique. Whether you manage an office complex, retail center, industrial warehouse, or school facility, we’ll help you choose a roofing system tailored to your specific needs and budget. Our team handles everything from material selection and permitting to expert installation and post-project support.
Let’s Talk About Your Commercial Roof – Get a Free Estimate Today
If you’re ready to explore your options for choosing the right commercial roof, we’re ready to help. With decades of experience and a commitment to quality, Shelter Roofing & Solar delivers durable, energy-efficient solutions designed to protect your property and support your business goals.
Get a free estimate now and let us help you find the right roofing system for your commercial building—built to perform and built to last.
