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Writer's pictureA. Fricker Roofing

Modified Bitumen Roof: Pros, Cons, And Costs

Updated: Sep 20, 2022

Do you have a flat roofing system that is having problems? Is your business being hampered by the need for ongoing maintenance on your flat roof? If so, it could be time to replace your commercial roof.


Making the right material choice might be difficult. There are many various types of commercial roofing materials on the market, and each one can benefit you in a different way. The quality of installation has a direct impact on how effectively roofing goods perform. Modified bitumen, a common flat roofing membrane, will be briefly discussed in this article to help you with your research.



The information provided in the blog that follows will help you learn about:


  • What is a roofing system made of modified bitumen?

  • Cons and advantages of installation

  • Consideration of Costs


What Is A Modified Bitumen Roof?


You might have noticed that many flat roofing systems have a built-up roofing system. However, this apparatus was heavy and difficult to set up. Modified bitumen roof has replaced it over time.



It is an asphalt-based roofing system that is manufactured in a factory, reinforced with additional fabric, and created with the same physical attributes throughout the entire sheet. This membrane is frequently applied to hot and cold roof applications. It is frequently referred to as the "cousin" of the Built-Up roof system because bitumen is included.


It is a kind of long-lasting, protective roof covering that is mostly used for flat constructions and comes in sheets.


Application Methods For Modified Bitumen


The modified bitumen material is also available with a number of application techniques. For this roofing system, producers typically make one of two types of sheets. Which are:


Atactic Polypropylene (APP)

Styrene Butadiene Styrene (SBS)


Pros Of Modified Bitumen Roofing Systems


We trust you are familiar with modified bitumen and its various forms. It's time to comprehend this membrane's advantages now.


Easy To Install


Most roofing membranes for commercial roofs include complexity and are therefore challenging to install. So, a modified bitumen roof is easier to assemble when compared to materials like built-up roofs. This single-ply roofing system is available in rolls and sheets that are simple to install. As a result, labor costs can be reduced.


The roofing expert can also apply modified bitumen using a variety of techniques, including both hot and cold treatments.

Effective Against Leaks


A roof made of modified bitumen is highly effective at stopping leaks. This is due to the lack of seams on this type of roof, which is placed using an adhesive. The components that are most prone to leaks are the seams. This may allow water to enter, which may cause the roof to deteriorate.


It is significantly less prone to leak because it is laid without seams, making it a good waterproofing sheet.


Versatile Nature


Asphalt and reinforced fibers are the main ingredients in modified bitumen. These two materials, which are both exceedingly flexible, give the sheet its great resistance. This contributes to the fame of this roof, which is used on both commercial and residential buildings.


UV Protection


When selecting a roofing material, UV protection is a crucial aspect that needs to be taken into account. Your roof's premature ageing and damage, such as discoloration, cracking, and fading, are caused by ultraviolet radiation. With the right UV protection in your roofing material, this can be avoided.


Particularly if you install an APP-modified bitumen sheet, which is even superior regarding reflectivity, a modified bitumen roof is renowned to give good heat resistance.


Cons Of Modified Bitumen Roofing Systems


Modified bitumen has various disadvantages even if it has numerous benefits, such as the capacity to withstand high temperatures and durability. We'll look at a few of them now.


Lifespan Can Be A Problem


One of the elements you are most likely to take into account when choosing a suitable roofing material is a long life expectancy. A long-lasting roof will give you peace of mind and allow you to concentrate on your business without worry.


The life expectancy of a modified bitumen roof can be problematic. Typically, it lasts 15 to 20 years. Even while it's not terrible for a business roof, this falls short when compared to other widely used roofing membranes, such EPDM roofing systems.



Can Get Damaged From Standing Water


Low or no slope is a defining feature of flat roofs. The lack of a slant slope makes it difficult for the water to flow down, which causes stagnant water. Your roof can be harmed more as a result of the time it spends submerged. Modified bitumen roofs can be destroyed more quickly by standing water, which is one of its main drawbacks.


You must make sure that water does not remain on your roof for an extended period of time during the rainy season since it can seriously damage it.


Check For Punctures And Cracks


Even if a modified bitumen roof is resistant to tearing and cracking, you should nonetheless check them. It's critical to take care of any cracks and punctures as soon as you can because they can cause leaks.


Speak With A Professional


Calling a pro is preferable for roof maintenance. This is as a result of their increased knowledge and access to better resources. Hiring an expert will spare you the risk of climbing a roof on your own.


Want To Install A Modified Bitumen Roof?


We trust you gained a lot of knowledge regarding a modified bitumen roof and its potential benefits. Make sure to get in touch with A. Fricker Roofing if you decide it's appropriate for you and are searching for experienced roofing professionals.


The best in the industry is us. For many years, our company has offered roofing services. Our team has installed numerous Modified Bitumen roofs in Tulsa and the surrounding areas, and we have a total experience of 50 years.


Call us at (918) 402-7167 right away to make an appointment with one of our knowledgeable roofers. We'll tour your property to make sure we fully comprehend what you're trying to accomplish.


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