The Pros and Cons of EPDM Roofing Is It the Right Choice for Your Building?

The Pros and Cons of EPDM Roofing: Is It Right for Your Building?

EPDM (Ethylene Propylene Diene Monomer) roofing has been a popular choice for flat and low-slope roofs for over 50 years. Made from a synthetic rubber compound, EPDM is durable, weather-resistant, and relatively cost-effective. However, like any roofing material, EPDM has its unique advantages and drawbacks. In this blog, we’ll break down the pros and cons of EPDM roofing to help you determine if it’s the right choice for your building.

Pros of EPDM Roofing

1. Durability and Longevity

    •    EPDM roofs are highly durable, lasting up to 25-30 years or more with proper maintenance. This is due to the material’s resistance to UV rays, ozone, and extreme temperatures.
    •    Resistant to Impact: EPDM is flexible and can withstand some impact from hail, falling branches, or foot traffic without tearing, making it a great option for areas with fluctuating weather.

2. Weather Resistance

    •    UV Resistance: EPDM roofing is resistant to UV rays, which helps it withstand sunlight without cracking or becoming brittle.
    •    Extreme Temperatures: This material performs well in both high and low temperatures, resisting thermal expansion and contraction. It can handle temperatures ranging from -40°F to 300°F, making it ideal for many climates.
    •    Waterproofing: EPDM is naturally waterproof, which is critical for flat roofs where water drainage is often slower. Proper installation ensures a water-tight seal.

3. Affordability

    •    EPDM is one of the most cost-effective flat roofing materials available, costing less per square foot than other options like TPO or PVC.
    •    Its long lifespan and low maintenance requirements help make it a good investment for property owners.

4. Ease of Installation and Maintenance

    •    EPDM can be installed in large sheets or smaller pieces, which allows for flexibility depending on roof size and layout.
    •    Repairs are typically straightforward. Minor tears or punctures can be fixed with adhesive patches, saving on labor and repair costs.

5. Energy Efficiency Options

    •    EPDM is available in black, which absorbs heat, making it a popular choice in colder climates as it helps reduce heating costs.
    •    White EPDM is also available and reflects sunlight, helping to keep the building cooler in warmer climates.

6. Eco-Friendly Material

    •    EPDM is recyclable and generally considered an eco-friendly option. At the end of its lifespan, EPDM roofing can often be recycled into new roofing materials or used for other products, which helps reduce environmental impact.

Cons of EPDM Roofing

1. Appearance

    •    Basic Aesthetic: EPDM roofing has a plain, rubbery appearance, which may not be visually appealing compared to other materials like modified bitumen or TPO.
    •    Limited Color Options: EPDM is primarily available in black or white, which may limit design options for buildings where roof aesthetics are a priority.

2. Vulnerability to Certain Types of Damage

    •    Punctures and Tears: While generally durable, EPDM can be punctured by sharp objects, such as falling debris, or damaged by heavy foot traffic. Once damaged, water can seep in and compromise the roofing system if repairs aren’t done promptly.
    •    Susceptibility to Chemicals: Certain chemicals, oils, or solvents can degrade EPDM material, so it’s less suitable for rooftops exposed to such substances (such as restaurants with rooftop exhaust vents for grease).

3. Installation Challenges

    •    While EPDM is generally easy to install, it requires expertise for proper application. Poor installation, especially at seams or around roof penetrations, can result in leaks or roof failure.
    •    Adhesive Requirements: EPDM installation often relies on adhesives, which can be sensitive to temperature and moisture. This means that installation during wet or extremely cold conditions may be difficult or compromised.

4. Seam Issues

    •    Although EPDM sheets are available in large sizes to minimize seams, there will still be some seams, particularly on larger roofs. Over time, these seams may require resealing to prevent water infiltration.
    •    Seam Adhesion: Adhesives can wear out over time, especially in climates with heavy rainfall, requiring occasional re-sealing to ensure the roof remains watertight.

5. Energy Efficiency in Hot Climates

    •    Black EPDM Can Retain Heat: While black EPDM is great for cold climates, it can absorb a significant amount of heat in warm regions, leading to higher cooling costs.
    •    White EPDM is available but tends to be more expensive, and its heat-reflective properties are less effective than some other white roofing materials, such as TPO or PVC.

6. Compatibility with Certain Roof Features

    •    EPDM may not be the best choice for roofs with multiple penetrations or complex shapes, as this can increase the risk of leaks if not properly sealed.
    •    Installing equipment mounts, vents, or other penetrations after the EPDM roof is in place can be challenging, as each penetration needs to be carefully flashed and sealed.

Is EPDM Roofing Right for You?

EPDM is a reliable, affordable, and long-lasting option for many types of buildings, especially in regions with moderate to cold climates. It’s particularly well-suited for:
    •    Commercial Buildings: EPDM’s cost-effectiveness and ease of maintenance make it a popular choice for commercial properties.
    •    Flat or Low-Slope Roofs: Due to its waterproof nature, EPDM works well on flat or low-slope roofs where water drainage is a concern.
    •    Eco-Conscious Projects: If sustainability is a priority, EPDM’s recyclability and eco-friendly properties make it a strong contender.

However, EPDM may not be ideal if aesthetics are a primary concern or if your roof is located in a hot climate where reflective materials are more beneficial. Additionally, for roofs with heavy foot traffic or where chemical exposure is possible, another material like TPO or PVC may be more suitable.

Final Thoughts

EPDM roofing offers a range of advantages that make it a solid choice for many building owners, but understanding its limitations is key to making an informed decision. With proper installation and maintenance, an EPDM roof can offer decades of reliable protection. If you’re considering EPDM for your roof, consult with us to ensure it’s the best fit for your building’s needs and local climate conditions.