Modified Bitumen Roofing Contractor in Orange County
Some commercial roofs take more abuse than others. Rooftop units need service, crews walk the surface often, and summer heat bakes the membrane for months. Modified bitumen handles that kind of wear with multiple layers of reinforced asphalt. OC Roof Kings is a modified bitumen roofing contractor serving commercial and multifamily properties across Orange County.
Our work covers new installations, repairs on aging roofs, and full replacements when the old system has run its course. To start, our crew walks the roof and documents what we find with photos. Next, you receive a written scope, so every task and material is clear before the job begins.
Mod Bit Roofing for Commercial Buildings
Modified bitumen, often shortened to mod bit, is asphalt blended with rubber or plastic modifiers. Manufacturers then press the blend into reinforced sheets that go down in layers. Usually, a base sheet bonds to the deck and a cap sheet goes on top. As a result, the finished roof has more than one line of defense against water.
Most cap sheets carry a granulated surface that shields the asphalt from sunlight and gives crews better footing. For that reason, mod bit roofing works well on retail centers, older office buildings, and apartment complexes with busy rooftops. It also pairs closely with Built-Up Roofing, its older multi-layer relative.
SBS and APP Modified Bitumen
The modifier blended into the asphalt changes how the sheet behaves on the roof. Two types cover most commercial jobs, and each one has its own strengths. Before recommending either, we look at the roof slope, the sun exposure, and how the building uses its rooftop. Here is how the two compare.
SBS Modified Bitumen
SBS stands for styrene butadiene styrene, a rubber modifier. It gives the sheet stretch, so the membrane flexes as the roof expands and contracts through the seasons. SBS sheets also accept several application methods, including cold adhesive and self-adhering backings. That flexibility makes SBS a common choice on roofs with a lot of movement.
APP Modified Bitumen
APP stands for atactic polypropylene, a plastic modifier. Compared with SBS, it produces a stiffer sheet with strong resistance to sunlight. Crews typically apply APP sheets with heat, which melts the backing onto the layer below. Because Orange County roofs see long, sunny summers, APP deserves a look on exposed commercial roofs.
Is Mod Bit the Right Choice for Your Building?
Every roof has its own demands, so we compare a few systems before settling on one. Mod bit stands out on roofs with heavy foot traffic, frequent equipment service, or a history of punctures. In addition, reflective cap sheets can help a reroof meet the cool roof rules in California’s Title 24 energy code.
A careful modified bitumen roofing contractor also tells you when another system makes more sense. For instance, a large open roof with little traffic may suit TPO Roofing, with its wide, reflective sheets. Similarly, EPDM Roofing offers a flexible rubber option for simpler roof layouts. We explain the trade-offs in plain language.
How We Work as Your Modified Bitumen Roofing Contractor
At OC Roof Kings, a mod bit project moves through four stages, and each one builds on the last. Your property manager gets updates at every stage. Just as important, we plan the work around your tenants. That way, deliveries, parking, and business hours stay on track during the job.
Roof Survey and Written Scope
First, we survey the whole roof, including the deck, drains, parapet walls, and any existing layers. We also measure the areas around rooftop units and pipes that need special detailing. Then we put our findings into a written scope with photos. The work begins only after you sign off on that scope.
Tear-Off and Deck Repair
When the old roof has to come off, our crew removes it in sections. As a result, the building never sits open to the weather overnight. After that, we inspect the exposed deck for rot, rust, and soft spots. We replace any damaged decking before insulation or cover board goes down.
Base Sheet and Cap Sheet Installation
Next, we install the base sheet and bond it firmly to the prepared surface. The cap sheet follows, with each roll overlapping the one before it. We use the application method the product and building call for. Throughout the install, the crew checks every lap so the seams seal along their full length.
Flashing and Final Inspection
Walls, curbs, drains, and pipes each receive their own mod bit flashing, since leaks often start at these transitions. Once the flashing is complete, we walk the entire roof and test the drains. Finally, you receive photos of the finished work, your written warranty paperwork, and a clean site.
Modified Bitumen Roof Repair and Replacement
A mod bit roof usually shows warning signs well before it fails. However, those signs are easy to miss from the ground. An experienced modified bitumen roofing contractor checks the roof up close. Then we tell you whether repairs will hold or replacement is the better investment. Either way, you get photos and a clear explanation first.
Common Mod Bit Roof Repairs
Most modified bitumen roof repair calls involve blisters, open laps, cracked cap sheets, or bare spots where granules have worn away. Flashing that pulls loose from walls and curbs causes trouble too. To fix these, we open the damaged area and let it dry. Then we install new material that bonds with the old roof.
A can of sealant might hide a small crack for a season. Still, a lasting repair means finding out why the damage started, whether that is ponding water, foot traffic, or failing flashing. For leaks that need a full search across the roof, our Commercial Flat Roof Repair team takes over.
When Replacement Makes Sense
Replacement becomes the smarter path when blisters and open seams cover large areas or water has soaked the insulation. At that point, each new patch only buys a little time. Instead, we remove the worn layers and install a new system sized to your building. Our Commercial Roof Replacement page covers the full process.
Protecting a Mod Bit Roof Over Time
Granule loss, clogged drains, and loose flashing all start small on a mod bit roof. For that reason, a scheduled Commercial Roof Inspection each year pays off by catching them early. Our Commercial Roof Maintenance agreements also keep drains clear and seams checked. On an older roof, Commercial Roof Coating can add a protective layer over worn areas.
Modified Bitumen Roofing Across Orange County
Working with a local modified bitumen roofing contractor means shorter response times when a storm opens a seam. Our crews handle shopping centers and apartment roofs in Anaheim. We also take on commercial and industrial buildings in Fullerton and Orange, CA. Our Service Areas page lists every city we reach.
Why Property Owners Choose OC Roof Kings
Property owners want a modified bitumen roofing contractor who pays attention to small details. Our crew treats every lap and flashing with that care. Clients across Orange County rate us 5 stars on Google. To see every roofing system we offer, visit our Commercial Roofing page. Family-owned and operated. Licensed and insured. More than 20 years.
Do you own a home with a flat or low-slope section? In that case, our Flat Roofing page covers residential roofs rather than commercial buildings. Whichever page fits your property, you work with the same crew and get the same written scope before any work starts.
Frequently Asked Questions
Modified bitumen is asphalt blended with rubber or plastic modifiers, then formed into reinforced sheets. The modifiers help the asphalt flex through heat and cold instead of cracking. Crews install it in layers, usually a base sheet under a cap sheet, on flat and low-slope roofs.
Blisters, open laps at the seams, and cracked cap sheets top the list. Granule loss can also leave the asphalt exposed to direct sunlight. Poor drainage makes each of these problems worse over time. Fortunately, a yearly inspection catches most of them while repairs are still small.
Crews install modified bitumen in layers over a clean, dry deck or insulation board. Depending on the product, the sheets bond with heat, cold adhesive, hot asphalt, or a self-adhering backing. Each sheet overlaps the one before it, and the crew seals every lap along its full length.
No. Modified bitumen is an asphalt-based membrane installed in several layers. TPO is a single-ply plastic membrane with seams fused by hot air. The surfaces differ too, since mod bit usually has a granulated cap while TPO is smooth and white. Each one suits different roofs and building uses.
Not exactly, although the two share a lot of history. A built-up roof uses many layers of felt and hot asphalt assembled on site. Modified bitumen arrives as factory-made sheets, so the roof needs fewer layers. Many roofers see mod bit as a modern relative of the built-up system.
Talk to a Modified Bitumen Roofing Contractor
Planning a new roof or chasing leaks on an aging mod bit system? Call OC Roof Kings at (949) 561-2069 or reach out online to book a roof assessment. You get a modified bitumen roofing contractor who inspects the roof, lays out the options, and puts the plan in writing. California Contractor License #600662.
