Types of Roofs for Commercial Buildings

When it comes to commercial buildings, the choice of roofing is crucial. The commercial roofing system is not just a structural necessity but also an element that impacts energy efficiency, aesthetic appeal, and long-term maintenance costs. There are various types of commercial roofing suitable for commercial buildings, each with its own advantages and disadvantages. This blog will delve into the most common types of commercial roofs and explore their unique features, providing insights from experienced commercial roofers.

Flat Roofs

Commercial flat roofs are a popular roofing choice for many types of buildings due to their practicality and cost-effectiveness. As the name implies, flat roofs have a minimal slope compared to traditional pitched roofs. These roofs have a slope that’s typically about 1/4 to 1/2 inch per foot.

Advantages

  • Cost-Effective: Flat roofs are generally cheaper to install and maintain compared to sloped roofs.

  • Space Utilization: They provide additional space for HVAC systems, solar panels, or even rooftop gardens.

  • Ease of Installation: Installation and inspections are easier due to the minimal slope.

Disadvantages

  • Drainage Issues: Flat roofs can have drainage problems, leading to water pooling and potential leaks.

  • Maintenance: They require regular maintenance to prevent debris accumulation and water damage.

Metal Roofs

Metal roofs are a highly durable and versatile roofing option for commercial buildings. Made from materials like steel, aluminum, and copper, these roofs are known for their exceptional longevity. Their robust construction makes them resistant to extreme weather conditions, including heavy rain, snow, and high winds.

Advantages

  • Durability: Metal roofs can last 40-70 years, far exceeding the lifespan of other roofing materials.

  • Energy Efficiency: They reflect solar heat, reducing cooling costs during hot weather.

  • Ease of Installation: Installation and inspections are easier due to the minimal slope.

Disadvantages

  • Initial Cost: The upfront cost of metal roofing can be high.

  • Noise: Metal roofs can be noisy during rain or hail storms unless properly insulated.

TPO Roofing

Thermoplastic Olefin (TPO) roofing is a single-ply roofing membrane that is gaining popularity in the commercial sector. It’s made from a blend of polypropylene and ethylene-propylene rubber. It is known for its reflective properties, which help reduce cooling costs. TPO roofing can be mechanically attached, fully adhered, or ballasted.

Advantages

  • Energy Efficiency: TPO roofing is highly reflective, reducing heat absorption and cooling costs.

  • Durability: It is resistant to tears, punctures, and chemical exposure.

  • Cost-Effective: TPO offers a good balance between cost and performance.

Disadvantages

  • Installation Quality: The performance of TPO roofing highly depends on the quality of installation.

  • Newer Technology: Being relatively new, long-term performance data is still being gathered.

EPDM Roofing

Ethylene Propylene Diene Monomer (EPDM) is a type of synthetic rubber roofing membrane. It’s a single-ply rubber membrane that is highly durable and weather-resistant. It is typically black, but white variants are available to reflect sunlight and reduce heat absorption. EPDM roofs are known for their flexibility and ease of installation.

Advantages

  • Durability: EPDM roofs can last up to 50 years with proper maintenance.

  • Weather Resistant: It performs well in extreme temperatures and weather conditions.

  • Flexibility: EPDM is highly flexible, making it suitable for various roof shapes and structures.

Disadvantages

  • Appearance: The black color of EPDM can absorb heat, potentially increasing cooling costs.

  • Installation: Seams and penetrations must be carefully installed to prevent leaks.

Built-Up Roofing (BUR)

Built-Up Roofing, commonly known as BUR, consists of multiple layers of bitumen (asphalt) and reinforcing fabrics. These layers create a durable and waterproof surface. The top layer can be coated with gravel or other materials for added protection against UV rays and weather elements.

Advantages

  • Durability: The multiple layers provide excellent protection against the elements.

  • UV Protection: The top layer can be coated with reflective materials to reduce heat absorption.

  • Low Maintenance: BUR systems require minimal maintenance once installed.

Disadvantages

  • Weight: BUR systems can be heavy, requiring a strong structural support.

  • Installation Time: The installation process is labor-intensive and time-consuming.

  • Fumes: The installation process can produce unpleasant fumes.

Modified Bitumen Roofing

Modified Bitumen roofing is a type of asphalt product that can be applied in multiple layers. This type of roofing involves asphalt-based sheets modified with plastic or rubber polymers. The sheets are rolled onto the roof and adhered using heat or adhesives. Modified bitumen roofing is flexible and resistant to extreme weather conditions.

Advantages

  • Flexibility: It can handle a wide range of temperatures and weather conditions.

  • Durability: Modified bitumen is resistant to punctures and tears.

  • Ease of Repair: Damaged sections can be easily repaired.

Disadvantages

  • Installation: Proper installation is critical, requiring experienced contractors.

  • Appearance: It may not be as aesthetically pleasing as other roofing options.

  • UV Sensitivity: Without proper UV protection, it can degrade over time.

Shingle Roofing

While more common in residential buildings, shingles are sometimes used in smaller commercial buildings.

Advantages

  • Variety: Shingles come in a wide range of colors, styles, and materials.

  • Ease of Installation: They are relatively easy and quick to install.

  • Cost-Effective: Shingles are often less expensive than other roofing materials.

Disadvantages

  • Durability: Shingles have a shorter lifespan compared to metal or rubber roofing.

  • Maintenance: They require regular inspections and maintenance to prevent damage.

  • Weather Resistance: Shingles can be damaged by severe weather conditions.

Choosing the right roof for a commercial building involves considering various factors such as cost, durability, energy efficiency, and maintenance requirements. Each roofing type has its own set of advantages and disadvantages, making it important to assess the specific needs of the building and its environment. Contact Kresta Roofing for more in-depth information about commercial roofing and the materials used. We have over 40 years in the construction and roofing industry and we can help you decide which roof is best for your property. Schedule a Free Roofing Quote today!