Modified Bitumen
Modified Bitumen Roofing in Dallas, TX
Modified bitumen roofing has changed over the past 50 years or more from being a novel experiment to one of the most widely used commercial roofing systems. Millions of projects around the world have chosen it as their roofing material of choice due to its high tensile strength, long lifespan, and very simple installation. But what precisely is modified bitumen roofing, and why is it better than other types of roofing?
Modified Bitumen Built-up Roofing
When modified bitumen is added to the common roofing asphalt to replace plasticizers lost during distillation, bitumen roofing systems are created.
It is then strengthened with fiberglass or polyester fiber matting to improve its tensile strength and longevity.
SBS (styrene-butadiene-styrene) and APP are the two forms of modified bitumen roofing that are most frequently used (atactic polypropylene).
While APP increases the roofing system’s ability to maintain strength over time, SBS increases the flexibility of the roofing membrane by giving it stronger expansion and contraction capabilities.
An expert roofing contractor in your area will be able to advise you on the best option for your house since each type is popular in various climates and purposes.
There are many benefits to choosing a modified bitumen roof.
The gravel absorbs and dissipates heat, aids in better water evaporation, and keeps moisture and heat away from the underlying layers.
When your team has to access the roof or contractors are working on your bitumen roofing system, the looser gravel helps to provide a better grip for foot traffic.
Keep in mind that some gravel on modified bitumen roofing systems must stay loose to prevent damage or punctures from foot traffic. The gravel must also be kept reasonably evenly distributed across the roof at all times.
Application of Modified Bitumen Roofing
Modified bitumen is often sold as rolls of membrane that are attached to the substrate using an adhesive. In some circumstances, the material can self-adhere. The material can also be heat welded or cold-adhered.
Additionally, some modified bitumen membranes may be mechanically fastened. A base layer and a cap layer are often required for applications, although in some circumstances it may be installed in a multi-ply system with three or more layers.
Modified Bitumen Roofing Types
APP Membrane Roofing
Membranes made of atactic polypropylene (APP), sometimes known as “plastic asphalt” membranes, are composed of asphalt mixed with plasticized polymers that expand under high temperatures. APP is a wonderful option for buildings looking to achieve a “cool roof” effect because it is UV-resistant.
SBS Membrane Roofing
Styrene-butadiene-styrene, or SBS, roofing is best thought of as “elastic” or “rubberized” asphalt. For a membrane with a natural elasticity and flexibility, asphalt and polymerized rubber are combined. SBS is a fantastic option for structures whose roofs experience large temperature swings as well as roofs exposed to stronger winds.
Benefits of Modified Bitumen Roofing
Tear-Resistant
Waterproof
Easy Installation, Repair & Maintenance
It’s Flexible
It’s Energy Efficient