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The Modified Bitumen roofing system is similar to the tar and gravel roof in that this roof adds layers of polyester or fiberglass with bitumen. These additional layers add strength and resistance to a flat roof. The Modified Bitumen system is also considered to be the “hybrid” in that they incorporate the high-tech formulation and prefabrication advantages of single-ply with some of the traditional installation techniques used in built-up roofing. There are several surfacing options for this system, which include a factory applied mineral surface, a gravel surface laid in bitumen or a liquid applied coating that is typically reflective in nature. If you are in the St. Louis area and are in need of a Modified Bitumen roofing system installation or replacement, you have come to the right place.
Modified Bitumen membranes can be applied with hot mopping asphalt or heat applied application. Hot applied modified bitumen membrane roofs incorporate the durability and strength of built-up roofs with light weight and reflectivity of single-ply roof systems.
Including single-ply membrane roofing systems, United Construction Solutions LLC also specializes in the design and installation of modified bitumen roofing systems. We are Certified applicators of the modified bitumen roofing. Modified Bitumen membrane roof systems have a proven track record of almost four decades. Modified Bitumen roof systems have quickly become the roof system of choice by architects, school districts, building owners and much more in the St. Louis Missouri, area. At United Construction Solutions our foremost priority is safety and always the needs of our client. We will ensure that we have met those needs and exceeded your expectations every step of the way.
History of the Modified Bitumen Roof System
Modified Bitumen was first developed and utilized in Europe in the 1960s. This membrane is manufactured in uniform sheets comprised primarily of polymer-modified bitumen reinforced with one or more plies of fabric, or ply sheets. The fabrication can include polyester, glass, or a combination of the two. When applied in roofing, the finished version may be comprised of several sheets of modified bitumen and asphalt to create a uniform matrix.
When used in conjunction with a thermoplastic polymer, APP (Atactic Polypropylene), a uniform matrix is created within the modified bitumen sheets. This matrix increases the bitumen’s resistance to ultraviolet (UV) light, increases its flexibility in extreme temperatures, and increases its resistance to water penetration. This added resilience and enhanced durability under extreme conditions make modified bitumen a prime choice when there may be movement or deflection of the underlying deck of a roof.
Modified Bitumen roofing systems create watertight barriers that perform for many years at a time due to the multiple layers. When built-up, these layers of bitumen exhibit exceptional resistance to the conductivity of heat between the exterior and interior of the building. This generates a noticeable reduction in heating and cooling costs. The thermoplastic polymers used in the modified bitumen make it more fire resistant as well. The technology employed in creating this roofing system makes it affordable and easy to generate as well.
Advantages of Modified Bitumen Roofing
There are several key advantages of modified bitumen roofing, the first of which being that it has a high tensile strength. Tensile strength is a surface’s resistance to tension, meaning that it will hold up to foot traffic, maintenance, and other projects on your roof without breaking under pressure.
In addition, modified bitumen roofing is very hearty, making it a viable option in extreme climates with temperatures that regularly fluctuate. Despite changes in temperature, it’s still waterproof. In addition, it’s more appropriate for flat roofs or roofs with low slopes, while other types of roofing options aren’t a good fit in these circumstances.
Believe it or not, bird droppings cause a lot of roof damage because of their acidic nature. But flat roofing options like modified bitumen are much easier cleaned. If birds nest or regularly visit your roof, it will be much easier to clean and maintain than other roofing options.
Also, note that there are two main types of modified bitumen roofing, as follows.
Both types of modified bitumen are asphalt products, and SBS can be applied in one of two ways: with cold adhesive or hot asphalt. Low slope variants of modified bitumen roofing begin with a base anchored with nails, which is then covered with mid-plys, cap sheets, and self-adhering membranes. One of the key advantages of SBS over APP (discussed next) is an additional coat that makes the surface resistant to UV radiation, thus extending its life in harsh sunlight.
Atactic Polypropylene (APP)
APP remains resistant to harsh weather while remaining flexible, even in cold weather. As opposed to SBS, APP is heat-welded to the roof’s surface with a torch, thereby bonding it to the substrate and creating a seal. APP is also resistant to harsh climates with dynamic weather, which helps protect the roof from cracking, wrinkling, blistering, and splitting as heat and cold make the surface shrink and expand.
There are a million and one factors that determine the overall life expectancy of any roofing system. However, modified bitumen can be expected to last 15 to 20 years, depending on climate and how well it’s maintained. Sometimes warranties are available that last as long as 20 years, so you have the peace of mind that your roof will last for years to come. If you’d like to know more about roofing options for your commercial building, feel free to reach out for a free estimate.