Modified Bitumen Roofing Contractor in
Denton, Dallas, Fort Worth & DFW

Reliable, time-tested roofing systems for flat and low-slope commercial buildings.

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Built for Durability and Waterproofing

Modified bitumen roofing is a multi-layer commercial roofing system that’s been a trusted solution for flat and low-slope roofs for over 50 years. It’s derived from asphalt — the same base material used in built-up roofing (BUR) — but enhanced with polymer modifiers that significantly improve flexibility, durability, and performance over a wide range of temperatures.

For commercial property owners in the DFW area, modified bitumen offers proven waterproofing performance and long-term durability that holds up through Texas heat, cold snaps, and severe weather events.

Multi-layer system

Polymer-modified asphalt

20–30 year lifespan

APP & SBS options

When to Call for Mod-Bit Repair or Replacement

Modified bitumen is a durable system, but like all roofing, it requires attention as it ages. Here are the most common signs that your mod-bit roof needs professional evaluation.

Alligatoring or Cracking

Surface cracking that resembles alligator skin is a sign the asphalt has dried out and the membrane is losing its flexibility and waterproofing properties.

Blistering or Bubbling

Air or moisture trapped between layers causes blisters. Left unaddressed, they will eventually rupture and create entry points for water.

Seam or Lap Failures

The overlapping seams between sheets are a common failure point. Separation at laps allows water to work its way under the membrane.

Granule Loss

Granule-surfaced mod-bit loses its protective coating over time. Significant granule loss exposes the underlying membrane to UV damage.

Ponding Water

Standing water that doesn’t drain within 48 hours accelerates deterioration and can add significant structural load over time.

Interior Water Stains or Leaks

Water inside the building — especially after rain — is a clear indicator that the roof system has been compromised.

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A Proven System for Commercial Buildings

Key Benefits

  • Outstanding waterproofing performance — multi-layer protection
  • Flexible and durable through temperature extremes
  • Strong puncture and tear resistance
  • Can be coated to improve energy efficiency
  • Long service life with proper maintenance
  • Easier to repair than some single-ply systems

Common Repair Types

  • Office buildings
  • Multi-family and apartment properties
  • Retail centers
  • Light industrial facilities
  • Schools and institutional buildings
  • Rooftop deck applications

Common Questions About
Modified Bitumen Roofing

How long does a modified bitumen roof last?

A well-installed modified bitumen roof typically lasts 20 to 30 years, depending on the system, installation quality, and level of maintenance. In Texas, UV exposure is the primary aging factor — routine inspections and timely repairs can significantly extend the roof’s useful life.

What's the difference between APP and SBS modified bitumen?

APP (Atactic Polypropylene) and SBS (Styrene-Butadiene-Styrene) are the two types of polymer modifiers used in mod-bit systems. APP membranes are torch-applied and perform well in hot climates — making them a common choice in Texas. SBS membranes are more flexible and can be installed with cold adhesive or heat, and are better suited for climates with significant cold-weather movement. We’ll recommend the right type for your building and conditions.

Can modified bitumen be repaired instead of replaced?

Yes — modified bitumen is one of the more repairable commercial roofing systems. Seam failures, localized membrane damage, and flashing issues can often be addressed with targeted repairs. Whether repair or replacement makes sense depends on the roof’s age, the extent of damage, and overall system condition. We’ll give you a clear picture after the inspection.

Is modified bitumen a good choice for a Texas climate?

Yes, particularly APP-modified systems, which are torch-applied and designed to handle high heat without softening. One consideration is that traditional granule-surfaced mod-bit absorbs more heat than reflective membranes like TPO — if energy efficiency is a priority, a white-coated mod-bit system or a different membrane may be worth discussing.

How much does modified bitumen roofing cost in DFW?

Cost depends on the size of the roof, the installation method, the number of layers, and any existing conditions that need to be addressed (such as substrate repair or insulation). We provide a detailed written estimate after inspecting the roof so there are no surprises.

Why Choose Anderson Roofing & Contracting?

Our reputation means everything to us and we stand behind every project we are a part of. You can rest assured that the job will be done right and attention will be paid to every detail.

Free Estimates

We provide free inspections and estimates.

10 Year Labor Warranty

We stand proudly behind our work
and provide a 10-year labor warranty on all re-roofing projects.

Licensed & Insured

You can rest assured – Anderson Roofing is licensed and insured.

Priority Is Quality

We emphasize on-site management, quality assessment checks, safety, and cleanliness

Family Owned

We’re a family-owned and operated Texas business.

Professional & Polite

We stress professionalism and excellence in everything we do

Get A Free Estimate

Contact our team of roofing experts today for exceptional service and professionalism.

We look forward to assisting you with all of your roofing and gutter needs!

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