Longhorn Construction Blog

Modified Bitumen | Longhorn Commercial Roofing in Austin, TX

Matt Parker - Sunday, October 15, 2017

Modified Bitumen is an asphalt-based roofing product, similar to the Built-up-Roof (BUR) designed for low-slope or flat roofs. It offers the benefits of a BUR roof, but also offers additional strength, flexibility and UV resistance. Modified Bitumen provides multiple layers of protection, and tolerates extreme environmental elements. Various methods are used for the installation of this type of roofing system, including the hot torch method and sealant-backed peel and stick rolls. Modified bitumen roofing ensures your business is protected from the elements and can save you money on energy consumption. Longhorn Commercial Roofing in Austin, TX can provide you with the roofing solution you need.

Modified Bitumen | Longhorn Commercial Roofing in Austin, TX

The layers that define Modified Bitumen consists of the following:   

1. Insulation  provides temperature stability of the roof system.

2. Modified base sheets and plies.

3. Modified Bitumen Membranes are composed of co-polymer reinforced with polyester or fiberglass for added strength, resisting tears and punctures.

4. Adhesive is combined with a waterproofing material, and can be applied either hot or cold.

5. Surfacing  includes a factory application, a gravel application, or a liquid applied roof coating, and others. Provides UV protection and additional weathering resistance.


There are primarily two types of modified bitumen roofing. Styrene Butadiene Styrene (SBS) and Atactic Polypropylene (APP). Both can be reinforced for added strength and a long service life. SBS has the properties of elongation and recovery. This enables it to better deal with stresses from temperature extremes, wind, and the typical contraction and expansion. APP is more plastomeric whereas SBS is more elastomeric. APP ensures the weathering better but lacks the flexibility of SBS. They differ in the method of installation. Styrene Butadiene Styrene (SBS) is typically installed with either heat welding, hot asphalts or cold adhesives. Atactic Polypropylene (APP) will almost always utilize the hot torch method in its installation process, but can be heat welded or utilizing a cold-application of adhesives. Contact Longhorn Commercial Roofing in Austin, TX for additional information.

The Benefits of a Modified Bitumen Roof from Longhorn Commercial Roofing in Austin, TX

  • Proven track record of performance and excellence for flat or low-slope roofs
  • Weather resistant and water proof even in temperature extremes
  • Its multiple layers provide additional protection, if one layer is damaged, the other layers make a leak less likely to occur
  • Offers a broad range of application methods
  • Offers a wide range of top-surfacing materials, including cool roof solutions
  • Available in a variety of colors for improving your building's appearance
  • The insulated layer can assist you to cut energy costs
  • High tensile-strength, yet is flexible with expansion and contraction for building movement and temperature variations
  • Cost effective and competitive with other roofing systems
  • Can provide fire, wind, and/or hail resistance
  • Can resist punctures and tears
  • Competitive in cost with other roofing systems
  • Easy to repair and maintain
  • Available in a VOC-free installation


The reliability of any roof begins with the professional expertise of the installer. For this reason, ensure you are receiving a qualified roofing expert. Longhorn Commercial Roofing in Austin, TX offers the expertise you require for a reliable roofing solution according to your budget and needs. Furthermore, any building owner wants a roof that lasts. Routine maintenance and annual or bi-annual roof inspections will help to ensure a roof that is reliable and long lasting. Thickness and durability are factors in the longevity of modified bitumen roofing, enabling you to choose the durability you need based on factors such as environment, foot traffic and other. The advantages of saving energy, and a long lifespan means they will not end up in the landfill as soon as some roofing types.

Longhorn Commercial Roofing in Austin, TX works closely with you to determine the proper roof system for your commercial building according to your needs and budget. We provide the information you need regarding your roofing options, so you can make an informed decision for your business.

In addition, we work with our customers in order to provide as little interruption as possible to your business. We complete our installations on time and on budget, so you can get on with what you do best.

Furthermore, our highly skilled employees are certified, experienced, and trained to install every type of commercial roofing system with first class quality  and craftsmanship. You can rely on Longhorn Commercial Roofing in Austin, TX.

Roof Repair

In addition to roof installation and replacement, Longhorn Commercial Roofing in Austin, TX offers professional roofing repair. We employ highly trained roof repair crews , who are experts in repair all types of commercial roofing. We can typically repair roof leaks or roof damage with minimal disruption to your business. When you need commercial roof repair, give us a call.

With more than 40 years of experience throughout all of Texas, you can rely on Longhorn Commercial Roofing in Austin, TX to provide dependable and professional commercial roofing system installation, repair and roof coatings. Longhorn Construction has installed approximately 3 billion square feet of commercial roofing through the years. We take pride in a job well done, and you can be confident our roofers are experienced professionals and can get the job done proficiently. If you are considering a modified bitumen roofing system in your project, or other commercial roofing types, give us a call today for a free estimate and consultation.
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