If you’re after superior waterproofing protection, high tensile strength, affordability, and a long lifespan for your commercial roofing system, a modified bitumen roof is a great choice! What sets it apart from other commercial roofing systems designed for low-sloped or flat roofs is that it is made from a combination of tar asphalt and rubber polymers or fiberglass reinforcers. Our team of roofing experts can explain the features of each modified bitumen material so you can make the best choice for your property. With us on the job, you can rest easy knowing that you’ll get all the benefits of a durable, leakproof modified bitumen roof.
Self-Adhered Modified Bitumen (SA Mod-Bit) membrane roof system delivers the reliable protection of traditional modified bitumen roofing for low-slope roofs. The advantage for building owners is rolled asphalt is an attractive roof available in multiple colors. Rolled asphalt systems are used in both residential and commercial applications with the advantage of being lower cost than EPDM membrane roofs.
Modified Bitumen FAQ's
A modified bitumen roof is a low-slope roofing system made from asphalt that is reinforced and “modified” with rubber or plastic polymers and fiberglass. It is installed in rolls and creates a tough, multi-layered membrane that provides strong waterproofing for flat and low-slope roofs.
Modified bitumen is commonly used on small commercial buildings, multifamily properties, and residential low-slope areas such as porch roofs, garage roofs, and flat sections that connect to steeper shingle roofs. It works well on roofs with lots of penetrations and transitions where a durable, layered system is helpful.
EPDM and TPO are single-ply membranes, meaning one main layer covers the roof. Modified bitumen is usually installed in multiple layers, which can increase toughness and puncture resistance. It also has a granulated surface that looks more like a mineral-surfaced roofing product. The best choice depends on your roof design and goals, and we explain the options during your inspection.
A self-adhered modified bitumen system uses rolls with a factory-applied adhesive backing. The membrane is rolled out and pressed into place instead of being torched or hot-mopped. Self-adhered systems can reduce fumes, are cleaner to install, and are often a good fit for occupied buildings and residential projects.
When properly installed and maintained, a modified bitumen roof can provide many years of reliable service on flat and low-slope roofs. Lifespan depends on the number of layers, exposure, and maintenance. To help with planning, you can start with our Instant Roof Quote tool, then schedule a free onsite appointment so we can evaluate your specific roof and give detailed recommendations.
Yes. Modified bitumen performs well in Rhode Island conditions, including snow, ice, rain, and strong sun. Its multi-layer construction and granulated surface make it a solid choice for roofs that see freeze–thaw cycles and heavy storms, as long as drainage and details are designed correctly.
Modified bitumen is used on both commercial and residential buildings. On homes, it is often installed on low-slope sections, porches, additions, and over rooms where shingles are not appropriate because the pitch is too shallow for shingle warranties to apply. It can tie in cleanly to adjacent shingle roofs when detailed by an experienced roofer.
Most modified bitumen membranes have a mineral granule surface, similar to the top of an asphalt shingle. This provides UV protection and a finished appearance. They are available in several colors, which can help the roof blend with nearby shingles or trim on the building.
Maintenance is straightforward. The roof should be inspected once or twice a year and after major storms, drains and gutters should be kept clear, and any punctures or seam issues should be repaired promptly. With this level of care, a modified bitumen system can stay watertight for many years.
If you have a flat or low-slope roof, or a section where shingles do not perform well, modified bitumen is one of the main systems to consider. A good way to start planning is to use our Instant Roof Quote tool to explore options, then schedule a free onsite appointment so we can inspect your roof, compare modified bitumen with other low-slope solutions, and recommend the best fit for your property.
