North Texas Commercial Roofing
Modified Bitumen Roofing for Commercial Buildings
Installation, replacement, repairs and maintenance for commercial low-slope roofs.
Top View Roofing offers modified bitumen roofing services for commercial properties. Whether you are planning a new roof or dealing with an aging asphalt-based system, we help you understand the roof’s condition and choose a scope that fits your building and budget.
What Is Modified Bitumen Roofing?
Modified bitumen, often called “mod bit,” is an asphalt-based roofing material reinforced with polyester, fiberglass or a combination of reinforcement materials. Polymers modify the asphalt to improve its performance. Factory-made sheets are installed as part of a layered roof assembly, with sealed laps and flashing at roof edges, walls and penetrations.
It is used on flat and low-slope commercial roofs. A complete assembly may include insulation, a cover board, base or ply sheets and a protective cap sheet. Even a roof described as “flat” needs effective drainage; the membrane is only one part of the system.
SBS and APP: Two Modified Bitumen Options
SBS Modified Bitumen
SBS stands for styrene-butadiene-styrene, a synthetic rubber modifier. It gives asphalt greater elasticity and flexibility at low temperatures. Depending on the product and assembly, SBS systems may be self-adhered, cold-applied, hot-asphalt-applied or heat-welded.
APP Modified Bitumen
APP stands for atactic polypropylene, a plastic modifier. APP membranes provide heat and weather resistance and are commonly installed by torch application. The specified membrane, substrate and application method must work together as an approved assembly.
“Torch-down roofing” describes an application method, not every modified bitumen roof. We discuss the appropriate system and installation approach for your property before work begins.
Our Modified Bitumen Roofing Services
New Roof Installation
Plan a complete roof assembly with membrane selection, insulation, drainage, attachment, perimeter details and flashing coordinated for the building.
Roof Replacement
Evaluate the existing roof and compare removal with a possible recover where conditions and applicable requirements allow. Wet or deteriorated materials need to be addressed before a new system is installed.
Leak Detection and Repairs
Investigate open laps, punctures, splits, flashing damage and leaks around rooftop equipment. Repairs use materials compatible with the existing membrane and the condition found.
Inspections and Maintenance
Check membrane condition, seams, flashings, roof edges and drainage. Document developing issues and plan repairs before they cause broader interior damage.
Benefits and Building Considerations
Modified bitumen can be a practical option for offices, retail properties, warehouses, multifamily buildings and other commercial properties with suitable low-slope roofs. Reinforced sheets and layered assemblies offer durable waterproofing, while compatible repair methods can help maintain an existing roof.
- Choose for the building: Roof movement, rooftop equipment, service traffic and exposure help determine the membrane and assembly.
- Protect the surface: Cap-sheet granules or an approved surfacing system protect the membrane. Walkway protection may be appropriate at equipment access routes.
- Plan for heat and energy use: Reflective surface options and insulation should be considered together. Energy results depend on the complete roof and building.
- Coordinate occupied spaces: Discuss access, staging, odors, work hours and fire precautions associated with the selected application method.
For comparison, explore our TPO roofing, PVC roofing and commercial roof coating services. Coating suitability depends on moisture, adhesion and material compatibility.
How We Plan Your Roofing Project
- Inspect and assess. Review the roof surface, leak history, drainage, flashings and accessible existing conditions. Discuss whether further moisture investigation is needed.
- Define the scope. Identify repairs, removal or recover work, insulation needs and the proposed membrane assembly. Explain access arrangements and exclusions in the written proposal.
- Complete the agreed work. Prepare the substrate and install the specified layers, laps, flashings and edge details using the selected system’s requirements.
- Review and maintain. Complete a final review and discuss care, documentation and any warranty terms included with your project.
What Affects Modified Bitumen Roofing Cost?
Pricing depends on roof area and access, the number and condition of existing roof layers, removal and disposal, deck repairs, insulation, drainage changes, rooftop penetrations and the selected assembly. A basic square-foot price cannot show all of those conditions.
Request a building-specific inspection and written estimate so you can compare the same scope, materials, exclusions and warranty terms. Service life also varies with installation, weather exposure, drainage and ongoing care; a warranty term is not a prediction of roof life.
Modified Bitumen Roofing FAQs
Can a modified bitumen roof be repaired instead of replaced?
Localized damage may be repairable when the surrounding roof remains serviceable. Widespread deterioration, repeated leaks or wet insulation may require a broader scope. An inspection helps identify the appropriate next step.
Can new roofing go over the existing roof?
Sometimes a recover is possible, but existing layers, moisture, deck condition, loading and applicable requirements must be evaluated first. Covering a problem does not resolve its cause.
How should a modified bitumen roof be maintained?
Arrange periodic professional inspections and checks after significant storms. Keep drainage paths clear, report leaks promptly and have seams, flashings and surface damage evaluated. Ask for an inspection schedule suited to the roof and any warranty requirements.
Is modified bitumen the same as built-up roofing?
They are related asphaltic systems. Modified bitumen uses factory-made polymer-modified sheets; built-up roofing uses successive layers of reinforcing plies and asphalt assembled on the roof. The exact layers and surfacing vary by specification.
Do you provide commercial modified bitumen roofing in North Texas?
Yes. Contact our Texas commercial office in Sanger to discuss your property, location and project timing. Call (940) 297-1652 or use our contact form to request an inspection.
Discuss Your Modified Bitumen Roof with Top View Roofing
Get help planning installation, replacement, repairs or maintenance for your commercial property. Our Texas office serves North Texas building owners and property managers.
Material references: GAF SBS membrane overview and GAF APP membrane overview. Product selection and warranty availability are specific to the proposed project.