Modified Bitumen Roofing


Modified Bitumen Roofing Contractors Birmingham, AL Licensed & Insured Expert Roofers



Modified bitumen roofing systems provide the functions of built-up roofing, but with additional flexibility and durability, along with less labor requirements during setup. MBR is created for low-slope or flat roof structures and can be installed by hot asphalt mopping, cold process adhesives, or heat welding. They are usually made from rolled asphalt sheet membranes for ease of application which contain modified polymer bitumen and enhanced with fiberglass or polyester plies or a mixture of each. Factory surfacing is produced from aggregate, liquid-applied, granules, or metal foil laminate. Modified bitumen roof covering systems are commonly utilized for commercial roof, but it can also be used to flat residential roofs.




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MBR systems were introduced by researchers from Western Europe in the 1960s because of a need for longer lasting roofs that did not dry out quickly compared with the asphalt shingles and sheeting rolls that were offered at the time. Initially, this roof was majorly applied for manufacturing and commercial roofing installations as a result of the initial expense and durability. Today, there are more affordable techniques of preparing the roof covering material such that it can likewise be used for residential buildings.

In many regions, nevertheless, a construction permit is needed for the setup or re-installation of such a roof. In addition, certified contractors with expertise are the ones required to set up MBR systems that require hot processing to fasten the roofing on the structure. A building license is not needed when substituting minor areas of the roof or laying it on top of existing roof materials. Do It Yourself roof setups with self-adhesive, cold-processed modified bitumen roof covering systems save property owners cash. The residential market for MBR systems is nevertheless still not developed.



Kinds of Polymers and Additives

There are 2 major kinds of additives or polymers used to strengthen modified bitumen roof covering:.



1. APP (Atactic PolyPropylene)

This method increases the durability and life expectancy of the roof. APP is generally used with roof torch or heat welding to fasten to the substrate, producing a tough, plastic-like finish. APP system can operate well in hot weather condition and can resist oxidation, breaking, blistering, and damage from UV ray.



2. SBS (Styrene Butadiene Styrene)

This application increases the versatility of the roof membrane, enabling excellent expansion and contraction attributes. SBS is normally utilized with hot asphalt mopping or cold adhesives, resulting in a rubber-like roof membrane. Nevertheless, SBS requires a base that should be nailed down first before covering with cap sheets, self-adhering membranes, and mid-plies, and needs the use of protective finish against UV radiation.




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Manufacturing Method

MBR systems are made up of the following fundamental components: modified bitumen membranes, flashing, insulation, adhesive and base sheets. The main material is the modified bitumen membrane made from either fiberglass or polyester or a combination of the two. The insulation layer supplies thermal resistance that minimizes heat conduction in between the building and the roof. Flashing offers waterproofing protection along the roof's border while the base sheets add on to the durability and strength of the roof covering material. Surfacing protects the roof from wear and tear with UV light while adhesives attach the roof material to the building framework while giving it water resistance from the elements.

Modifiers are added to standard roof asphalt to replace them when plasticizers are taken off through distillation. Polyester fiber matting or fiberglass is used to strengthen bitumen so as to increase sturdiness and stability. The products for making these roof covering can only be ordered from a credible roofing products supplier.



Unique Considerations

Modified bitumen roofing is taken as single-ply instead of built-up roof covering. A substructure sheet or underlayment is, however, still suggested. Additionally, utilizing modified bitumen roofing for low slope roofs does not eliminate the need for correct drainage and insulation.

Modified bitumen roofing can greatly improve the efficiency and durability of flat or low-slope roofs. However, getting the best from MBR systems will depend upon the quality of installation and materials applied. Eventually, modified bitumen roofs will require professional roof contractors to take care of and repair them. Surface membrane degeneration might result as a result of exposure to chemicals, oils, and the elements.



Pros of Modified Bitumen Roof

There are many advantages of installing MBR to your building or house, and it has a proven history of reliability. Some of these advantages are:


  1. Cost-effective
  2. Stability even in extreme weather.
  3. Easy to repair
  4. Efficient expansion and contraction features
  5. Improved longevity
  6. Outstanding waterproofing qualities
  7. Heat reflective in order to help lessen energy bills
  8. High tensile durability (can resist oxidation, cracks, and blisters)
  9. Made in rolls for ease of application



Cons of Modified Bitumen Roofing

Nevertheless, like all kinds of roofing systems, MBR likewise has some drawbacks:


  1. Torch-down installation is fire hazard and may trigger certain damages to the subsurface if not applied correctly
  2. Unless correctly insulated, it can absorb heat that might trigger hot temperature level to the building below
  3. Premature aging and damage might result because of standing water or puddles left behind after rainstorms
  4. Durable just when prepared correctly
  5. Temperature constraints throughout setup
  6. Given that these roofing systems are durable, their end-of-life environmental effect may be unfavorable considering that they do not break down easily
  7. They are only appropriate for flat and low-sloping roofs



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Modified Bitumen Roofing (MBR) systems are asphalt-based materials specially created for flat or low-slope roof buildings and houses. They are set up with extra-strength supports and premium polymers to deliver the optimum longevity and functionality to the roofs. MBR may be set up with hot asphalt, torch-down method, or cold adhesives. There are many benefits that MDR systems provide and they are among the most durable and dependable roofing systems which have actually been utilized for many years now. MBR systems have substantially been used in the manufacturing and commercial market, but they are yet to come of age for the residential real estate market. Since they may have a negative end-of-life effect on the environment given that they are extremely sturdy, research must also be done on how most effectively to dispose of these roofing building materials.