Allied Construction and Roofing provides modified bitumen roofing services throughout Chicago and surrounding suburbs. We help commercial property owners with modified bitumen roof repair, replacement, inspections, leak repair, storm damage, maintenance, and emergency commercial roofing service.
For commercial flat roofs, low-slope buildings, active leaks, and replacement projects.
Modified bitumen roofing is commonly used on commercial flat and low-slope roofs because it offers durable waterproofing and dependable performance when installed and maintained correctly.
We install modified bitumen roofing systems for commercial flat roofs, low-slope buildings, warehouses, retail centers, and multifamily properties.
We repair roof leaks, seam issues, flashing failures, punctures, roof edges, drains, and membrane damage.
If your roof is aging, leaking repeatedly, or no longer cost-effective to repair, we can replace it with a new commercial roofing system.
Commercial roof leaks often travel beneath the roofing system before appearing inside. We inspect the complete roof assembly to locate the source.
Roof edges, parapet walls, curbs, penetrations, drains, and flashing are common leak areas that require proper repair techniques.
When your commercial roof begins leaking unexpectedly, our team responds quickly to help protect your building.
Modified bitumen has been used on commercial buildings for decades because of its strength, multiple waterproofing layers, and ability to perform in demanding environments.
It is commonly installed on warehouses, schools, apartment buildings, shopping centers, churches, industrial facilities, and office buildings throughout the Chicago area.
Even durable commercial roofing systems eventually require repairs due to age, weather exposure, foot traffic, and normal wear.
Water can enter through flashing, seams, penetrations, roof edges, drains, or damaged membrane areas.
Over time the roofing surface may develop cracks, splits, or blisters that allow moisture beneath the membrane.
Roof transitions and flashing details are among the most common locations for commercial roof leaks.
Poor drainage can shorten roof life and increase the chance of recurring leaks.
Wind, hail, snow, ice, and debris can damage commercial roofing systems throughout Chicago.
As modified bitumen roofs age, replacement may become more economical than continued repairs.
Some modified bitumen roofs can continue performing well with quality repairs. Others reach a point where replacement provides greater long-term value.
Our inspections help determine which option makes the most financial sense for your building.
Examples of commercial flat roofing projects, repairs, restorations, and completed roofing systems.



Modified bitumen roofing requires proper installation, strong flashing details, careful seam work, and a contractor who understands commercial low-slope roofing.
We work on commercial flat roofing systems for warehouses, offices, churches, retail centers, industrial buildings, and property managers.
We inspect the roof surface, seams, drains, flashing, penetrations, and interior leak points.
If the roof can be repaired, we will explain the repair. If replacement is smarter, we will explain why.
If water is entering your building, our team can respond quickly to reduce interior damage.
Property owners and managers receive updates, photos, and straightforward recommendations.
Our goal is to help your roof perform better, reduce future leaks, and protect the building from costly water damage.
Whether your commercial roof needs repairs, replacement, or a professional inspection, Allied Construction and Roofing is ready to help.
Commercial property owners choose Allied Construction and Roofing for dependable service, honest recommendations, and quality roofing work.
"Allied inspected our commercial roof, explained the problems clearly, and gave us options that made sense. Very professional from start to finish."
"They repaired our flat roof leak quickly and provided photos of the work. Communication was excellent."
"Honest roofing company. They did not try to oversell us and helped us understand the best solution for the building."
Common questions about modified bitumen roofing for commercial flat and low-slope buildings.
Modified bitumen is a commercial roofing system commonly used on flat and low-slope roofs. It is built in layers to provide durable waterproofing protection.
Yes. Many modified bitumen roofs can be repaired if the damage is isolated and the roof system is still in good condition.
Replacement may be recommended when the roof has widespread cracking, recurring leaks, membrane failure, trapped moisture, or is at the end of its service life.
Yes. We inspect seams, flashing, drains, penetrations, roof edges, ponding water areas, and interior leak points.
Yes. If your commercial roof is actively leaking, call or text Allied Construction and Roofing for fast roofing help.
Modified bitumen can be a strong option for commercial low-slope roofs when properly installed and maintained for local weather conditions.
Complete commercial and residential roofing services throughout Chicago and surrounding suburbs.
Whether your roof needs repair, replacement, or a professional evaluation, Allied Construction and Roofing can help you understand the best next step.