Torch-On Roofing for Flat Roofs: Why Is It a Popular Choice?

When it comes to flat roofs, finding the right roofing system can be a daunting task. You want a solution that not only provides durability and weather resistance but also offers ease of installation and maintenance. Enter torch-on roofing, a popular choice that has gained widespread acceptance in the roofing industry.

In this comprehensive guide, we’ll explore the ins and outs of this innovative roofing system, its advantages, and why it’s become a go-to option for flat roofs.

What is Torch-On Roofing?

Torch-on roofing, also known as torch-applied roofing or torch-down roofing, is a type of roofing system that utilizes modified bitumen membranes. These membranes are composed of a reinforced base material, such as fibreglass or polyester, and are coated with a rubberized asphalt compound.

The installation process involves heating the underside of the membrane with a specialized torch, which melts the asphalt compound and allows the membrane to adhere securely to the roof surface. Torch-on roofing is highly durable and offers excellent water resistance, making it a popular choice for flat or low-slope roofs.

Advantages of Torch-On Roofing for Flat Roofs

Torch-on roofing systems offer a multitude of benefits that make them an attractive choice for flat roofs:

• Durability: The modified bitumen membranes used in torch-on roofing are highly resistant to weathering, UV radiation, and temperature fluctuations. This ensures long-lasting protection for your flat roof, often with a lifespan of 20 years or more.
• Waterproofing: The seamless application of torch-on roofing creates a watertight barrier that effectively prevents leaks and moisture penetration, safeguarding the integrity of your building.
• Flexibility: The rubberized asphalt compound in the membranes allows for some flexibility, accommodating minor movements and settling of the roof structure without compromising the roofing system’s integrity.
• Ease of Installation: Experienced roofing contractors can efficiently install torch-on roofing systems, minimizing disruptions to your daily operations.
• Low Maintenance: Once installed, torch-on roofing requires minimal maintenance, reducing long-term costs and ensuring a hassle-free ownership experience.
• Energy Efficiency: Some torch-on roofing membranes are available with reflective coatings or cool roof technology, which can help reduce energy consumption by reflecting sunlight and minimizing heat absorption.

Torch-On Roofing Installation Process

The installation of a torch-on roofing system is a specialized process that should be carried out by trained and experienced roofing professionals. Here’s a general overview of the steps involved:

• Surface Preparation: The existing roof surface is thoroughly cleaned and primed to ensure proper adhesion of the new roofing system.
• Base Sheet Installation: A base sheet, typically a fibreglass-reinforced or polyester-reinforced membrane, is mechanically fastened or adhered to the roof deck using specialized adhesives or hot asphalt.
• Cap Sheet Installation: The cap sheet, which is the top layer of the roofing system, is unrolled and heated with a specialized torch. As the asphalt compound melts, the cap sheet is pressed onto the base sheet, creating a seamless and watertight bond.
• Flashing and Detailing: Flashing and detailing work are performed around roof penetrations, such as vents, pipes, and skylights, to ensure a complete and watertight seal.
• Surfacing and Finishing: Depending on the specific requirements and desired aesthetics, a surface coating or granular surfacing may be applied to the cap sheet for added protection and visual appeal.

Maintenance and Repair of Torch-On Roofing

Like any roofing system, torch-on roofing requires regular maintenance and occasional repairs to ensure its longevity and optimal performance. Here are some key considerations:

• Inspections: Conduct regular inspections, at least annually, to identify any potential issues, such as cracks, blisters, or loose seams.
• Cleaning: Keep the roof surface clean by removing debris, dirt, and any vegetation growth that may compromise the roofing system.
• Repairs: Address any identified issues promptly by hiring a qualified roofing contractor to perform necessary repairs, such as patching or resealing.
• Recoating: Depending on the specific roofing system and manufacturer’s recommendations, periodic recoating may be required to maintain the roofing’s reflective properties or extend its lifespan.

Cost of Torch-On Roofing

The cost of a torch-on roofing system can vary depending on several factors, including the size of the roof, the complexity of the project, and the specific materials used.

In general, torch-on roofing tends to be more expensive than some other flat roofing options, such as built-up roofing (BUR) or single-ply membranes. However, the long-term durability and low maintenance requirements of torch-on roofing can offset the initial higher cost over the lifespan of the roof.

It’s essential to obtain multiple quotes from reputable roofing contractors and compare the costs, materials, and warranties offered to ensure you’re making an informed decision that aligns with your budget and long-term goals.

Comparing Torch-On Roofing to Other Flat Roofing Options

While torch-on roofing is a popular choice for flat roofs, it’s not the only option available. Here’s a brief comparison of torch-on roofing with other common flat roofing systems:

Ultimately, the choice between different flat roofing systems will depend on your specific needs, budget, and the unique characteristics of your building.

Popular Uses of Torch-On Roofing

Torch-on roofing systems are widely used in various applications, thanks to their durability, waterproofing capabilities, and suitability for flat or low-slope roofs. Some of the most common uses include:

• Commercial Buildings: Office buildings, retail spaces, and industrial facilities often feature flat roofs, making torch-on roofing an excellent choice for these structures.
• Multi-Family Residential Buildings: Apartment complexes, condominiums, and other multi-unit residential buildings frequently utilize torch-on roofing for its low maintenance requirements and long-lasting performance.
• Educational Facilities: Schools, universities, and other educational institutions often have large, flat roof areas, where torch-on roofing can provide reliable protection and energy efficiency.
• Healthcare Facilities: Hospitals, clinics, and other healthcare buildings prioritize roofing systems that offer durability, waterproofing, and ease of maintenance, making torch-on roofing a suitable option.
• Institutional Buildings: Government buildings, museums, and other institutional structures often have unique architectural designs with flat or low-slope roof areas, where torch-on roofing can be an effective solution.

Common Issues with Torch-On Roofing and How to Address Them

While torch-on roofing systems are known for their durability and reliability, they are not immune to potential issues. Here are some common problems that may arise and how to address them:

• Blisters or Ridging: Blisters or ridges can form on the surface of the roofing membrane due to trapped moisture or improper installation. Addressing these issues promptly by hiring a professional roofing contractor is crucial to prevent further damage.
• Ponding Water: Flat roofs are susceptible to ponding water, which can lead to premature degradation of the roofing system. Ensuring proper drainage and addressing any low spots or improperly installed drains is essential.
• Shrinkage or Splitting: Over time, the roofing membrane may shrink or split due to exposure to UV radiation or temperature fluctuations. Regular inspections and timely repairs can prevent further deterioration.
• Flashing Failures: Flashing around roof penetrations, such as vents or skylights, can fail over time, leading to leaks. Periodic inspections and repairs to the flashing are necessary to maintain the integrity of the roofing system.
• Foot Traffic Damage: Heavy foot traffic or improper access to the roof can cause punctures or damage to the roofing membrane. Implementing proper walkway systems and limiting access to authorized personnel can help mitigate this issue.

Summary

Torch-on roofing has proven itself to be a popular and effective choice for flat roofs, offering durability, waterproofing, and low maintenance requirements. While it may have a higher initial cost compared to some other flat roofing options, the long-term benefits and performance of torch-on roofing can outweigh the upfront investment.

When considering a torch-on roofing system for your flat roof, it’s crucial to evaluate your specific needs, budget, and the unique characteristics of your building. Factors such as the size of the roof, the complexity of the project, and the desired level of energy efficiency should all play a role in your decision-making process.