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Modified Bitumen Roofing For Commercial Buildings


Experienced In Installing & Maintaining Modified Bitumen Roofing Systems

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Easy To Maintain

Flexible & Durable

Energy Efficient

Cost-Effective

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Modified Bitumen Roofing offers exceptional durability, weather resistance, and energy efficiency, making it an excellent choice for commercial buildings. When you choose Starkweather Roofing as your roofing partner, you benefit from our decades of experience, commitment to quality, and personalized approach.

What Is A Modified Roof?


Modified Bitumen Roofing is a time-tested and versatile roofing system designed for commercial buildings. It is a type of asphalt-based roofing material that has been modified with added polymers or other materials to enhance its performance. The modification process gives the bitumen greater flexibility, elongation, and resistance to temperature fluctuations, making it a durable and long-lasting roofing option.

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Layers Of A Modified Bitumen Roof

Preventing cooling and heating losses requires a thick layer of insulation on a flat or slow-slope commercial roof. A strategic system of plates and screws or hot mopping attaches quality insulation to the modified bitumen roofing.

Above the insulation layer is the vapor barrier that prevents moisture buildup from condensation. Controlling moisture is necessary because too much can lead to mold growth or weaken structural supports.

A protective cover board must rest above the insulation and vapor barrier with a torch-down roofing system. Water can pond on the surface of a modified bitumen roof from incorrect overlay installation.

The base sheet is the first layer of the roof material. The contractor can hot mop or torch it during installation.

A heating process melts the outer layer of the modified bitumen membrane together, and an initial roll roofing material clings to the base sheet to protect the building’s structural integrity. The roof of a commercial building might require multiple layers for adequate protection.

You must have flashing and sealants for HVAC systems, parapet, and piping that rise above a flat or low-slope roof. Metal flashing is common for preventing water from penetrating around the parapet edges.


Why Choose Starkweather Roofing For Your Modified Commercial Roof

At Starkweather Roofing, we understand that each commercial property has unique roofing requirements. Our personalized approach ensures that your Modified Bitumen Roofing system is tailored to meet your specific needs and budget. Whether it's a new installation, re-roofing project, or routine maintenance, you can trust Starkweather Roofing to deliver a durable and efficient roofing solution that protects your commercial building for years to come.

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Experts In Modified Bitumen Roofing For Commercial Buildings


As a family-owned company serving the local region and beyond for over 27 years, we understand the unique needs of area businesses. Companies choose our services time and time again due to the depth of our expertise and the one-on-one attention we offer each client.


You’ll be treated as more than just another job ticket when you trust us for your modified roofing — we treat our clients like a part of the Starkweather family.

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The Benefits of Commercial Modified Bitumen Roofing

Modified Bitumen Roofing offers exceptional durability, weather resistance, and energy efficiency, making it an excellent choice for commercial buildings. Here are some of the key benefits of modified bitumen roofing for commercial buildings with Starkweather Roofing:

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Exceptional Durability

Modified Bitumen Roofing is renowned for its exceptional durability, making it an ideal choice for commercial buildings with flat or low-sloped roofs. It can withstand heavy foot traffic, weather elements, and even minor impacts, ensuring a longer lifespan and reduced maintenance costs over time.

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Weather Resistance

With its modified formulation, bitumen roofing provides excellent weather resistance, effectively protecting commercial buildings from rain, snow, and extreme temperature fluctuations. The material's waterproofing properties prevent leaks and water damage, keeping the interior of the building safe and dry.

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Flexibility & Thermal Stability

Modified Bitumen Roofing's flexibility allows it to expand and contract with changes in temperature, reducing the risk of cracks and splits. Its thermal stability ensures that it can handle prolonged exposure to sunlight without deteriorating, further contributing to its longevity.

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Energy Efficiency

Modified Bitumen Roofing can be installed with reflective coatings, which help to reflect sunlight and reduce the building's cooling load. This enhances the building's energy efficiency and may lead to reduced energy costs over time.

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Easy Maintenance & Repairs

Routine maintenance and minor repairs are relatively simple with Modified Bitumen Roofing. Regular inspections and proactive maintenance by experienced professionals, such as Starkweather Roofing, can help identify and address any issues promptly, ensuring the roof's optimal performance.

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Cost Effectiveness

The long lifespan and low maintenance requirements of Modified Bitumen Roofing contribute to its cost-effectiveness over time. With proper installation and maintenance by experienced professionals, like Starkweather Roofing, you can expect your investment in a Modified Bitumen Roofing system to provide excellent value for your commercial property.

Commercial Modified Bitumen Roofing FAQs

Got a question? We’re here to help.

  • What is Modified Bitumen Roofing, and why is it suitable for commercial roofs?

    Modified Bitumen Roofing is a type of asphalt-based roofing material that has been enhanced with added polymers or modifiers to improve its performance and durability. It is particularly suitable for commercial roofs with low-slope or flat configurations. The material's flexibility, weather resistance, and thermal stability make it an excellent choice for commercial buildings, ensuring long-lasting protection against various weather elements and foot traffic.

  • How long does Modified Bitumen Roofing typically last on commercial buildings?

    When properly installed and maintained, Modified Bitumen Roofing can last between 15 to 25 years or more. The material's longevity may vary based on factors such as the quality of installation, climate, and maintenance practices. Regular inspections and proactive maintenance by experienced roofing professionals can extend the roof's lifespan and reduce the need for premature replacements.

  • Is Modified Bitumen Roofing energy-efficient?

    Modified Bitumen Roofing can be installed with reflective coatings, known as cool roof coatings, which help reflect sunlight and reduce the building's cooling load. This contributes to improved energy efficiency and may lead to reduced cooling costs during hot weather. Additionally, the material's thermal stability helps regulate indoor temperatures, providing further energy-saving benefits.

  • Can Modified Bitumen Roofing be installed on existing commercial roofs?

    Yes, Modified Bitumen Roofing can be installed as an overlay on existing commercial roofs, making it a cost-effective option for roof replacement projects. However, a thorough inspection by roofing professionals is essential to ensure the existing roof is suitable for the overlay and to address any underlying issues before installation.

  • How is Modified Bitumen Roofing installed on commercial roofs?

    Modified Bitumen Roofing can be installed using various methods, including torch-applied, hot-mopped, and self-adhesive techniques. The choice of installation method depends on the roof's design, substrate, and specific project requirements. Experienced roofing professionals, like Starkweather Roofing, will recommend the most suitable installation method for your commercial building's needs.

  • What maintenance is required for Modified Bitumen Roofing on commercial roofs?

    Modified Bitumen Roofing requires regular inspections and proactive maintenance to ensure its optimal performance and longevity. Roofing professionals should inspect the roof at least twice a year and after severe weather events. Maintenance tasks may include cleaning debris, repairing any damaged or punctured areas, and reapplying protective coatings as needed. Timely and proper maintenance is crucial in maximizing the lifespan and cost-effectiveness of Modified Bitumen Roofing for commercial roofs.

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Contact Us For Commercial Modified Roof Systems


Trust Starkweather Roofing to deliver a modified roofing system that not only protects your building but also enhances its overall performance, all while providing exceptional customer service and value for your investment. Contact us today for a consultation and take the first step towards securing a superior roofing solution for your commercial property.

We Aren't Just Experts In Modified Bitumen Roofing


Starkweather Roofing stands out as an unrivaled expert in a wide range of commercial roofing services, making us the premier choice for all commercial roofing needs. With over 27 years of experience in the industry, we've honed our skills and expertise, offering comprehensive solutions for various roofing materials, including TPO, SPF, metal, tile, and modified bitumen.

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