Flat roofs are a common feature in many commercial properties, so ensuring their durability and longevity is crucial. One of the critical elements in maintaining a robust flat roof is choosing the right waterproofing system. To help you select the system that’s right for you, however, there are a number of things to consider. In this guide, we will discuss the following topics and provide a comprehensive guide to the best waterproof flat roofs.
- The importance of effective waterproofing
- The different types of flat roof waterproofing systems
- Factors to consider when selecting a waterproofing system
- The benefits and drawbacks of various materials
- Tips for maintenance and repair.
- The importance of hiring experienced professionals
Importance of Finding the Best Waterproof Flat Roofs
Waterproofing is the cornerstone of a reliable and long-lasting flat roof. Flat roofs are more susceptible to water damage compared to sloped roofs due to their horizontal design. Without proper waterproofing, flat roofs are prone to leaks, moisture build-up, and structural damage. The consequences of inadequate waterproofing can result in expensive repairs, interior damage, and disruption to your business’s operations.
All of this sounds obvious, but it’s essential to consider these factors when choosing a solution. There will absolutely be cheaper options available to you, and they can be tempting to consider. But it’s far better to invest a little bit more to ensure you have a long-lasting solution that suits your needs and won’t halt your business’s operation should there be a catastrophic leak.
You should also consider your insurance, as not all policies will cover the damage caused by a flood or leak.
Types of Flat Roof Waterproofing Systems
Firstly we need to understand what flat roof systems are available. Below we have listed the most common types you will come across. Each has its own pros and con’s with a specific purpose for each.
Built-Up Roofing (BUR)
BUR systems consist of multiple layers of asphalt and reinforced membranes. These systems are time-tested and offer excellent protection against water intrusion. They are cost-effective, durable, and suitable for roofs with moderate foot traffic.
Benefits: Affordable, widely available, excellent waterproofing capabilities.
Drawbacks: Susceptible to temperature changes, requires regular maintenance.
Modified Bitumen (MB)
MB systems combine asphalt with modifiers such as rubber or plastic to enhance performance. These systems are known for their flexibility, UV resistance, and ease of installation. MB systems are ideal for both new construction and retrofit projects.
Thermoplastic Olefin (TPO)
TPO membranes are single-ply roofing systems that offer excellent resistance against UV rays, punctures, and chemicals. They are lightweight, energy-efficient, and have gained popularity for their ease of installation and long lifespan.
Benefits: Energy-efficient, resistant to chemicals and UV radiation, long lifespan.
Drawbacks: Can be more expensive than other options, susceptible to punctures.
Ethylene Propylene Diene Monomer (EPDM) or Single-Ply
EPDM (also known as single-ply) is a synthetic rubber membrane that provides exceptional durability and weather resistance. EPDM roofs are known for their resistance to heat, ozone, and hail damage. They are cost-effective and can withstand extreme temperatures.
Benefits: Durable, flexible, resistant to weather extremes, easy to install.
Drawbacks: Vulnerable to punctures, may shrink over time.
PVC (Polyvinyl Chloride) Single-Ply
PVC roofing membranes are single-ply systems made of synthetic materials that provide excellent waterproofing capabilities. They are known for their exceptional durability, with a lifespan of up to 30 years or more. They also offer excellent heat-reflective properties, reducing cooling costs and making them an energy-efficient option. Their chemically resilient properties make them a first choice for many properties in industrial or chemical-heavy locations.
Benefits: Durability, energy-efficient, chemical resistance, low maintenance, fire resistant
Drawbacks: Higher cost. Although generally durable, they can be susceptible to punctures from sharp objects.
PU Liquids
Also known as Polyurethane Liquids, they are applied directly to the roof surface, forming a seamless and flexible membrane. Due to this application as a liquid, they are self-level, creating a seamless membrane that eliminates potential leakage points and provides excellent waterproofing. Their high elasticity allows them to accommodate thermal movements and structural shifts without compromising their waterproofing integrity. This flexibility helps prevent cracks and leaks in the roof system.
Benefits: Excellent waterproofing, self-levelling, compatible with many roofing materials such as concrete and metal
Drawbacks: Less UV resistance than other solutions.
Factors to Consider When Choosing a Waterproofing System
Climate and Weather Conditions
The climate and weather patterns of your region play a vital role in selecting the appropriate waterproofing system. Consider factors such as rainfall levels, temperature variations, and exposure to UV radiation.
Roof Usage and Foot Traffic
Determine the level of foot traffic your roof will experience. Different waterproofing systems have varying resistance to foot traffic and require appropriate protection measures.
Budget and Cost-effectiveness
Evaluate the long-term costs and benefits associated with each waterproofing system. Consider factors such as installation costs, maintenance requirements, and expected lifespan.
Corrosives
Are there man-made or natural environmental factors nearby that would result in corrosive elements interacting with your roof? For example, salt if your property is near the sea or chemicals from nearby manufacturing, power, or chemical plants.
Maintenance and Repair of Waterproofed Flat Roofs
Regular maintenance is crucial to extend the lifespan of your waterproofing system and ensure its effectiveness. Here are some essential tips:
- Conduct regular inspections to identify potential issues and address them promptly.
- Keep the roof surface clean and clear of debris, such as leaves and branches, which can trap moisture and compromise waterproofing.
- Inspect and repair any damaged or deteriorated areas of the waterproofing promptly. This includes addressing cracks, blisters, or punctures in the membrane.
- Maintain proper drainage by ensuring that gutters, downspouts, and scuppers are clear and functioning effectively. Poor drainage can lead to water pooling, increasing the risk of leaks.
- Regularly check and maintain the flashing around roof penetrations, such as vents, skylights, and HVAC units. Flashing plays a critical role in preventing water intrusion at these vulnerable points.
- Consider applying a protective coating to enhance the waterproofing system’s durability and resistance to UV radiation. Coatings can provide an additional layer of protection and extend the lifespan of the waterproofing.
If you don’t feel you have the time or expertise to carry out these checks effectively, we would always recommend speaking to a professional roofing contractor to undertake annual inspections and maintenance. Experienced contractors like ours can identify potential issues and provide expert recommendations for repairs or improvements.
Hiring an Experienced Flat Roofing Contractor
Proper installation and maintenance of a waterproofing system are essential for its effectiveness. Hiring an experienced and qualified flat roofing contractor is crucial for the following reasons:
Expertise: Professional contractors have in-depth knowledge and experience in installing various waterproofing systems. They understand the nuances of different materials, techniques, and local building codes.
Quality Workmanship: Skilled contractors ensure that the waterproofing system is installed correctly, minimising the risk of leaks and water damage. They follow industry best practices to deliver a high-quality and long-lasting solution.
Time and Cost Efficiency: Hiring professionals saves time and reduces the risk of errors or rework. They have the necessary equipment, tools, and workforce to complete the project efficiently. Additionally, contractors can provide cost estimates and help you choose the most cost-effective waterproofing system for your specific needs.
Conclusion
Selecting the best waterproofing system for your commercial flat roof is crucial to protect your investment and ensure long-term durability. Consider the climate, roof usage, and budget when choosing from options such as built-up roofing, modified bitumen, TPO, and EPDM.
Regular maintenance, prompt repairs, and professional inspections are essential for the system’s longevity. By hiring experienced flat roofing contractors and adhering to industry standards and certifications, you can have peace of mind knowing that your flat roof is effectively waterproofed, safeguarding your commercial property for years to come.