What Exactly Is A Modified Bitumen Roof & How Does it Work?

In the realm of commercial roofing, durability, and reliability are paramount. Businesses need roofing solutions that can withstand the elements, provide long-term protection, and require minimal maintenance.
One such solution that has gained widespread popularity is modified bitumen roofing. In this modified bitumen roof guide, we’ll break down all the factors that make it a great choice for commercial roofing, including:

• Its benefits and drawbacks
• The installation process
• Costs and longevity
• Maintenance requirements

What is Modified Bitumen Roofing?

Modified bitumen roofing is a type of membrane roofing system that is composed of asphalt and modifiers like styrene-butadiene-styrene (SBS) or atactic polypropylene (APP). These modifiers enhance the flexibility, elasticity, and durability of the asphalt, making it suitable for various roofing applications. Modified bitumen roofing is commonly used in commercial buildings with low-slope or flat roofs.

Why It’s Good for Commercial Roofing

Modified bitumen roofing offers several advantages that make it well-suited for commercial roofing applications:

• Durability: The addition of modifiers enhances the resistance of the asphalt to temperature extremes, UV radiation, and mechanical damage, resulting in a durable roofing system.
• Flexibility: Modified bitumen membranes can accommodate building movements and temperature fluctuations without cracking or splitting, ensuring long-term performance.
• Waterproofing: The multiple layers and seams of modified bitumen roofing provide excellent waterproofing properties, preventing water infiltration and protecting the building’s interior.
• Easy Installation: Modified bitumen roofing can be installed using various methods, including heat welding, cold adhesives, and self-adhering sheets, making it suitable for different roof configurations.
• Cost-Effective: Compared to some other commercial roofing systems, modified bitumen roofing offers a cost-effective solution in terms of installation, maintenance, and repairs.

All The Pros and Cons

Before making a big investment, like purchasing a new roof for your property, it’s important to know that to expect. Luckily, we’ve covered all of the details you need to know in this comprehensive pro and con list!

✅ Pros of Modified Bitumen Roofing:

• Excellent durability and weather resistance
• Flexible and can accommodate building movements
• Superior waterproofing properties
• Versatile installation methods
• Cost-effective compared to alternative roofing systems

❌ Cons of Modified Bitumen Roofing:

• Susceptible to punctures from sharp objects
• Requires regular maintenance to maximize longevity
• Installation may require professional expertise
• Can be challenging to repair certain types of damage

How is Modified Bitumen Roofing Installed?

The installation process of modified bitumen roofing typically involves the following steps:

1) Surface Preparation:

The roof surface is cleaned and inspected for any existing damage or imperfections. Any repairs or adjustments to the substrate are made as necessary.

2) Installation of Underlayment:

A base layer, such as insulation or a cover board, is installed to provide thermal insulation and a smooth surface for the modified bitumen membrane.

3) Application of Modified Bitumen Membrane:

The modified bitumen membrane is applied to the roof surface using the selected installation method, such as heat welding, cold adhesives, or self-adhering sheets. The membrane is rolled out and overlapped to create a watertight seal.

4) Sealing and Finishing:

The seams and edges of the membrane are sealed using heat or adhesive to prevent water infiltration. Flashing and edge details are installed to ensure a secure perimeter.

5) Quality Inspection:

A final inspection is conducted to ensure that the modified bitumen roofing system is properly installed and free of defects.

How Much Does Modified Bitumen Roofing Cost?

The cost of modified bitumen roofing can vary depending on various factors, including the size of the roof, the complexity of the installation, the type of membrane and modifiers used, and local labor and material costs.
On average, the cost of modified bitumen roofing ranges from $3 to $7 per square foot installed. It’s essential to obtain quotes from multiple contractors and consider the long-term value and performance of the roofing system when evaluating costs.

How Long Does Modified Bitumen Roofing Last?

When properly installed and maintained, modified bitumen roofing can last between 20 to 30 years. However, the longevity of the roofing system can vary depending on factors such as climate, exposure to UV radiation, maintenance practices, and the quality of installation.
Regular inspections and timely repairs can help extend the lifespan of modified bitumen roofing and maximize its performance.

How Often Should Modified Bitumen Roofing Be Inspected?

To ensure the continued performance and longevity of modified bitumen roofing, it’s recommended to have it inspected at least twice a year, preferably in the spring and fall. Additionally, inspections should be conducted after severe weather events, such as storms or heavy rainfall, to check for any signs of damage or deterioration. Prompt identification and repair of issues can prevent costly repairs and extend the lifespan of the roofing system.

Signs of Damage to Watch Out For

During routine inspections, it’s essential to be vigilant for signs of damage or deterioration in the modified bitumen roofing system. Some common signs to watch out for include:

• Blisters or bubbles on the surface of the membrane
• Cracks or splits in the membrane
• Loose or missing flashing
• Ponding water or standing water on the roof surface
• Leaks or water stains on the interior ceiling

If any signs of damage are detected during the inspection, it’s crucial to address them promptly to prevent further deterioration and water infiltration.

How to Prevent Damage to Modified Bitumen Roofing

To protect and prolong the lifespan of modified bitumen roofing, consider implementing the following preventive measures:

Conduct Regular Inspections

Schedule routine inspections of the roofing system to identify and address any issues before they escalate.

Keep the Roof Clean

Remove debris, leaves, and other organic matter from the roof surface to prevent moisture retention and potential damage.

Address Drainage Issues

Ensure that the roof has proper drainage to prevent ponding water, which can accelerate deterioration and lead to leaks.

Trim Overhanging Branches

Trim trees and vegetation near the roof to prevent damage from falling branches and debris during storms or high winds.

Schedule Maintenance

Invest in regular maintenance, such as sealing seams and repairing any damaged areas, to extend the lifespan of the roofing system.

Install Your Modified Bitumen Flat Roof Today!

Modified bitumen roofing offers a durable, cost-effective, and versatile solution for commercial roofing applications. With its excellent durability, flexibility, and waterproofing properties, modified bitumen roofing provides long-term protection for buildings with low-slope or flat roofs.
By understanding its benefits and drawbacks, following proper installation and maintenance practices, and promptly addressing any signs of damage, businesses can ensure the continued performance and longevity of their modified bitumen roofing systems. Ready to make the switch to a modified bitumen roofing system? Contact Greentek today !