Why Should You Choose Modified Bitumen for Residential Flat Roofing?

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Why Should You Choose Modified Bitumen for Residential Flat Roofing?

17 August 2022
 Categories: , Blog


Are you planning to go for a flat roof design for your home? Flat roofs don't work well with all types of materials. Therefore, if you want a durable, weather-resistant structure, you must choose the right roofing material. Modified bitumen is one of the best materials for flat and low-slope roofs. It comprises polymer-modified asphalt reinforced with layers of fibreglass. The resultant material is sturdy, waterproof and resistant to severe weather. Below are three reasons why modified bitumen is an ideal roofing material for your residential flat roof.

Resistant to heat and sunlight

Most of the surface of a flat roof is usually exposed to heat and sunlight due to the absence of a slope. Therefore, the material absorbs a lot of solar heat, which can cause it to deteriorate. Prolonged exposure to heat leads to thermal expansion, which causes the seams to come apart. 

Modified bitumen has flexible roofing materials that can withstand temperature shifts without deteriorating. The fibreglass layer creates a highly reflective surface that prevents the roof from absorbing solar heat. These properties not only prolong the lifespan of the roofing structure but also increase the building's energy efficiency.

Waterproof roof surface

Moisture damage is a major concern with flat roofs. The structure's design increases the risk of ponding, where water stagnates on the roof surface, deteriorates the materials and infiltrates the structure. Both cold and hot weather can increase the risk of roof leaks in the following ways:

  • In hot weather, the roof expands and contracts, causing the seams to come apart. This allows moisture to infiltrate the structure.
  • In cold weather, roofing materials become brittle and crack, creating entry points for moisture.

The flexible materials used to manufacture modified bitumen prevent the roof from becoming brittle in extreme heat or cold. Unlike most roofing materials, modified bitumen can be heat-welded at the seams. This installation method creates a strong seal that doesn't break down easily when exposed to extreme temperatures.

Resilient to heavy foot traffic

Heavy foot traffic can weaken the roof surface, paving the way for premature wear and tear. Therefore, it's hard for homeowners to install penetrations or access the roof without exposing the structure to damage. Modified bitumen is reinforced with polymerised rubber or plastic to create a roof surface that can withstand heavy traffic. 

Most products have up to five layers of material, creating a thick and sturdy surface that can hold penetrations, including solar panels, skylights and HVAC equipment. Therefore, you don't have to worry about accessing these appliances and components without damaging your roof. The structure's resilience to heavy traffic allows for frequent maintenance, which is crucial to extending the roof's lifespan.

You must install your modified bitumen roof properly to achieve excellent performance and longevity. Therefore, contact a roofing contractor for more information about flat roof installation.