Modified Bitumen Flat Roofs

Based in Santa Rosa, CA. We specialize in providing sustainable roofing and solar solutions to residential and commercial customers.

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Modified bitumen flat roofs have revolutionized the roofing industry, providing a durable and reliable solution for commercial and residential buildings. This advanced roofing system combines the flexibility of traditional bitumen with modern technology, resulting in a superior product that offers long-lasting protection against the elements.

At Sustainable Living Builders in Santa Rosa, CA, our team of experts can take on your roofing project, and we get the job done promptly for your convenience. Contact us today.

Read below to learn more about Modified Bitumen Flat Roofs!

Features of Modified Bitumen Flat Roofs

Modified bitumen roofs are composed of a blend of bitumen, which is a sticky, black, and viscous substance derived from petroleum, and a variety of modifiers such as APP (atactic polypropylene) or SBS (styrene-butadiene-styrene). These modifiers enhance the properties of the bitumen, making it more flexible, resistant to temperature extremes, and durable.

One of the key features of modified bitumen flat roofs is their ability to withstand a wide range of weather conditions. They offer excellent UV resistance, preventing degradation and extending the lifespan of the roof. Additionally, they exhibit exceptional tensile strength, allowing them to withstand high winds and heavy loads. This makes them ideal for areas prone to severe weather conditions.

Benefits of Modified Bitumen Flat Roofs



Modified bitumen roofs have a long lifespan, typically ranging from 20 to 30 years, depending on maintenance and climate factors. They are designed to withstand the stresses of thermal expansion and contraction, making them highly resistant to cracking and splitting.



The addition of modifiers to the bitumen provides enhanced flexibility, enabling the roof to expand and contract without damage. This flexibility is especially important in regions with significant temperature fluctuations.


Easy Maintenance:

Modified bitumen roofs require minimal maintenance. Regular inspections, cleaning of debris, and prompt repair of any damages are usually sufficient to keep the roof in excellent condition.

Installation Process

The installation process for modified bitumen flat roofs involves several steps:

Surface Preparation:

The existing roof surface is thoroughly cleaned, removing any dirt, debris, or loose materials. Repairs are made to the substrate if necessary to ensure a stable base for the new roof.

Application of Base Sheet:

A base sheet is installed over the prepared surface using an adhesive or by torching. This layer provides a smooth and consistent surface for subsequent layers.

Addition of Modified Bitumen Membrane:

The modified bitumen membrane, either in rolls or sheets, is applied over the base sheet. The membrane is adhered using heat or adhesives, ensuring proper bonding.

Sealing and Flashing:

Flashing is installed around roof penetrations, edges, and corners to provide additional protection against water infiltration. Seams and joints are sealed to create a watertight barrier.

Final Surface Treatment:

Depending on the specific product, a final surface treatment may be applied. This could include a reflective coating or granules for added protection and aesthetics.

Contact Us!

Do you need to get in contact with us? We are just a quick phone call away! Our team is readily available to answer any questions or concerns you may have, and we have the knowledge and expertise to ensure you are taken care of promptly.

Modified bitumen flat roofs offer a reliable, durable, and energy-efficient solution for buildings of various sizes and types. Their advanced composition and installation techniques make them an ideal choice for climates with extreme temperatures and severe weather conditions. With proper maintenance, these roofs can provide long-lasting protection for decades. Whether for commercial or residential applications. Do you need a quote from our team at Sustainable Living Builders? Contact us today!

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What our customers are saying about our energy and sustainability building services

Highly Recommend

"This company was awesome to work with! Super responsive, on time, skilled installers. Did everything they said they were going to do, no surprises, and showed up when they said they were going to show up. All my neighbors keep complimenting my new roof. Everything was great. I highly recommend!"

~ Todd S.

These are the guys I'm using

"I used SLB on a commercial re roof project i had and they were awesome to work with. They communicated with me and let me know exactly what they were going to do, they did the job in a timely manner, gave me a great price, and they even cleaned up after themselves. These are the guys I'm using for any roof, gutter or solar needs!"

~ Guillermo L.

Latest and Best Materials

"Sustainable Builders removed my old roofing & installed a new one prior to my solar panels installation. It was a difficult job as I live on a narrow, winding hilly road with many trees & lines overhead. They had to do everything by hand. They did a great job in 4 days and my new roof is beautiful. The workers were experienced and accommodating. At the end they cleaned everything up and removed all debris. The company was very responsive to my concerns and needs. The price was very reasonable. I can recommend them highly. All materials were the latest and best available."

~Bonnie S.


Modified Bitumen Flat Roofs