Modified Bitumen Roofs: A Comparison Against Other Low-Slope Roofing Materials in Corpus Christi TX

When it comes to roofing materials, one of the most underrated low-slope choices in Corpus Christi TX are modified bitumen roofs. Many experienced and top-notch roofers in Corpus Christi TX refer to it as "modbit" roofs for short. These use a combination of asphalt, plastic, and rubber polymers. Most contractors apply them in two ways: through adhesives or heat welds.

In fact, most claim it is the successor of built-up roofing (BUR), which use base sheets and other materials to form a waterproof and insulating barrier that serves as a property's roof. Learn about their difference and advantages through Roofing Services & Solutions' breakdown.

BUR Vs Modified Bitumen Roofs

Built-up Roofing Systems

Built-up roofing or BUR systems have been used in the U.S. for more than a century. A traditional BUR system gets its name from the building of a roof on-site using layers of base sheet, interplay sheets and cap sheet or other surfacing such as gravel or liquid coating.

This form of roofing involves alternating layers of bitumen and fabrics that join together to create a membrane. It is then finished with an aggregate layer or coating. The most commonly used bitumen on these types of roofs are asphalt or cold-applied adhesive. The finish of the BUR sometimes looks rocky because the gravel and mineral granules or slag are mixed in with the asphalt, but these roofs can also be smooth.

Modified Bitumen Roofing Systems

A conventional alternative to BUR systems are modified-bitumen roofing systems. Modified bitumen is a roofing membrane consisting of asphalt and plastic or rubber polymers, and is therefore widely considered an evolution of asphalt built-up roofing (BUR). Modified bitumen displays the built-in redundancy of asphalt built up, as well as the UV resistance and flexibility of a modified membrane.

This roof system has two types: atactic polypropylene (APP) and styrene-butadiene-styrene (SBS). The SBS is the most common, boasting highly flexible membranes, giving it stronger expansion and contraction capabilities. APP, on the other hand, has exceptional aging properties, making it a more long-lasting option.

Modified bitumen membranes are hybrids that combine the high-technology formulation and prefabrication benefits of single-ply with traditional roofing installation techniques that are used in built-up roofing. These membranes are factory-fabricated layers of asphalt that are modified using a plastic or rubber ingredient and are combined with a reinforcement. (Continued)

On the other hand, ethylene propylene diene monomer (EPDM) or rubber roofs are an excellent alternative to modified bitumen roofs. However, is it just the same as modified bitumen -- with only the price as a differentiator?

The truth is, EPDM is quite environmentally friendly as modified bitumen roofs but the latter offers much more in durability and aesthetics. Learn more about their differences in EV Studio's detailed explanation below.

Modified Bitumen and EPDM Roofs Comparison

Since most modbit systems are torch-applied, the roofs may experience leaks when the proper moisture barrier is not installed underneath the coping cap on parapet walls. Other typical problems with this system include inadequate head laps and backwater laps which allow moisture infiltration. Effects of backwater laps are leaks and blisters which can lead to roof failure. Even cold-applied modbit systems can result in moisture infiltration as well as under application of adhesive which can result in poor lamination and roof leaks.

EPDM is a single-ply, flexible rubber roofing membrane that can easily be cut to size to fit any job. This system can either be full-cured prior to installation, or can be left to cure during natural weathering after installation. The most common application procedures include fully-adhered, mechanically-fastened, or loose-laid. The first method uses water-based adhesives to adhere the rubber to the substrate. The second method is attached by using manufacturer-approved mechanical means to the substrate. The third method involves securing the membranes only at the perimeters and any penetrations. EPDM roofing systems are usually sealed using adhesive or splice tape.(Continued)

Lastly, EPDM and other low-slope roofing materials are troublesome to repair. However, modified bitumen roofs make repairs easy and convenient. True enough, DIY is an option to execute the repairs. On the other hand, we're inclined to say to leave the work to professionals to ensure consistency and the efficiency of the repairs when possible.

If you'd like to try your hand in repairing your modified bitumen roofs, you can look at Tru Coatings' detailed post on this. Learn more below.

Repairing A Rooftop with Modified Bitumen Coating

Determine the extent of the damage.

The big issue with repairing a modified bitumen roof surface is the question of whether moisture has made its way into the asphalt layer and, if so, how much. It’s necessary to inspect the modified Bitumen Roof. If moisture damage has occurred, any affected insulation or lower-level deck material will have to be replaced before the top can be patched.

Cleaning the membrane.

Obviously, a patch job needs a clean surface. The outer membrane needs to be thoroughly swept of any dirt or debris. Do not power wash the surface, as any extra moisture can get trapped in the membrane.

Deal with any weathering.

Depending on the amount of damage and how old the coating is, the asphalt layer may have become significantly disturbed and may be in need of some thick coating to fill in any gaps in the membrane. (Continued)

Remember, modified bitumen roofs and other low slope roofing materials require the professional capacity of roofers in Corpus Christi TX with in-depth experience and knowledge in executing installations and repairs. If you have yet to find a good roofer, you can count on Galvan Builders to help. We are a company with decades of experience in handling repairs and installations. Learn more by talking with us today!

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Galvan Builders Construction Company
4938 Williams Drive,
Corpus Christi TX 78411
361-857-4341
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