Steadfast Roofing is a local, family-owned roofing company in Ruskin, FL, dedicated to offering top-quality roofing solutions. When it comes to flat roofing materials, two popular choices are modified bitumen and roll roofing. Understanding the differences between these materials can help you make an informed decision for your roofing project.
Understanding Modified Bitumen Roofing
What is Modified Bitumen?
Modified bitumen is often seen as an advanced evolution of built-up roofing (BUR) systems, which have been used on low-slope roofs for over a hundred years. This roofing material is created by combining asphalt with polymerized rubber or plastic and then reinforcing it with fiberglass or polyester fabric mats, resulting in a flexible and durable waterproof membrane.
Commonly used on low-slope commercial roofs, modified bitumen roofing can be installed in different configurations, including as part of a two-layer or multi-ply system, depending on the type and composition of the membrane.
What Are the Components of Modified Bitumen?
- Flat Roof Insulation
- Vapor Barrier
- Reinforced Polyester
- Base Sheet
- Cap Sheet
Modified bitumen roofing consists of several key components that contribute to its effectiveness as a roofing material, especially for flat or low-slope roofs. These elements work together to provide a cost-effective drainage solution and ensure a robust, impact-resistant waterproofing system.
Pros of Modified Bitumen Roofing
- Durable: Multiple layers and enhanced thickness make it highly durable, especially in high-traffic areas.
- Resilient: Sturdy against severe weather and temperature fluctuations, ideal for low-slope roofs.
- Easy Installation: Flexible and repair-friendly, fitting well in tight spaces.
- Compatibility: Works well with asphalt-based roofing compounds for easy integration and repairs.
Cons of Modified Bitumen Roofing
- Heat Absorption: Retains heat in summer, increasing cooling costs.
- High-Risk Installation: Installation methods can be risky, requiring extra precautions.
- Cost: Higher initial cost compared to other roofing options.
- Ponding: Susceptible to water accumulation, potentially causing long-term damage.
Understanding Roll Roofing
What is Roll Roofing?
Rolled roofing (MSR) is a mineral-surfaced asphalt product sold in 100 square foot rolls, each weighing approximately 75 pounds. It is widely available at home improvement stores, hardware retailers, and online. While similar to asphalt shingles, rolled roofing is generally more affordable, thinner, and less durable.
Pros and Cons of Roll Roofing
Pros:
- Affordability: Costs between $200-$350 per square, making it less expensive than asphalt or composite shingles.
- Ideal for Low-Incline Roofs: Suitable for roofs with a pitch less than 2:12 (2 inches of drop per 12 inches of horizontal length), such as gazebos, detached garages, or sheds.
- Quick Installation: Can be applied rapidly, often taking just a few minutes.
- Ease of Transportation: No special equipment is required for transport; it can be moved and applied with the help of a friend.
- Overlay Application: Can be installed over an existing roof, provided it is free of gravel or other debris that might damage the roll roofing.
Cons:
- Lower Durability: Typically lasts 5-8 years, which is shorter than the 20-year lifespan of most roofing materials.
- Lack of Flexibility: Unlike shingles, roll roofing does not expand or contract, making it prone to tearing as a single large sheet.
- Thin Material: Prone to tearing, punctures, and bald spots.
- Limited Resale Value: Generally does not enhance property value, and many potential buyers may view it unfavorably.
- Color Limitations: Available mainly in black and gray, with fewer color options.
Modified Bitumen vs. Roll Roofing: A Detailed Comparison
Lifespan
Modified bitumen roofs typically last between 20 to 25 years, providing greater durability compared to roll roofing, which generally lasts between 10 to 15 years.
Winner: Modified Bitumen
Cost Analysis
- Modified Bitumen: While it involves higher initial costs due to advanced materials and installation methods, it can lead to lower long-term expenses thanks to its reduced need for repairs and replacements.
- Roll Roofing: Offers a lower initial cost, which can be appealing for those on a tight budget, but may result in higher long-term costs due to more frequent replacements.
Winner: Roll Roofing (Initial Cost)
Weather Resistance
Modified bitumen provides excellent weather resistance, delivering superior waterproofing and durability in extreme conditions. In contrast, roll roofing, although durable, is more susceptible to weathering and damage from impacts.
Winner: Modified Bitumen
Aesthetic Appeal
Modified bitumen provides a range of design possibilities with various colors, patterns, and textures. Roll roofing offers limited aesthetic options.
Winner: Modified Bitumen
Conclusion
In the debate between modified bitumen and roll roofing, modified bitumen emerges as the superior choice for durability, weather resistance, and aesthetic appeal. Roll roofing, however, remains a viable option for those on a tight budget.
If you are impressed by modified bitumen or are considering other flat roofing materials, Steadfast Roofing offers expert installation and repair services. Contact us today to learn more about our roofing solutions by visiting Steadfast Roofing.
For further reading, check out our article on Designing Functional and Stylish Flat Rooftop Decks.
