Is EPDM Better than Bitumen?

EPDM (Ethylene Propylene Diene Monomer) and Bitumen (also known as asphalt) are popular roofing materials, each with its own set of advantages and disadvantages. To determine which one (EPDM or bitumen) is better, it’s essential to consider various factors such as durability, installation, maintenance, cost, and environmental impact.

Let’s explore these aspects together!

Durability

EPDM is known for its exceptional durability. It is resistant to UV rays, ozone, and extreme temperatures, making it a long-lasting roofing material. EPDM roofs can last 20-30 years or more with proper maintenance. Bitumen roofs, on the other hand, have a shorter lifespan, typically lasting around 10-20 years. The exposure to UV rays can cause bitumen to degrade over time.

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Installation

EPDM roofs are installed in large, single-ply sheets adhered or mechanically fastened to the roof substrate. The installation process is simpler and quicker compared to bitumen roofing. Bitumen roofing (when using traditional methods like built-up roofing), involves multiple layers of materials and requires more manpower.

Maintenance

EPDM requires minimal maintenance. It is resistant to several environmental factors, reducing the need for frequent repairs. On the other hand, bitumen roofs require more maintenance because of potential issues like cracking, blistering, and water infiltration.

Cost

In terms of upfront costs, bitumen roofing can be more budget-friendly compared to EPDM roofing. However, it’s important to consider long-term costs. EPDM’s durability can offset its higher initial cost over its extended lifespan, while bitumen may require more frequent repairs and replacements, ultimately impacting its overall cost-effectiveness.

Environmental Impact

EPDM is considered more environmentally friendly due to its recyclability and relatively lower energy consumption during manufacturing. It is less likely to release volatile organic compounds (VOCs) into the environment. Bitumen, on the other hand, is derived from petroleum and involves higher energy consumption.

Flexibility & Expansion

EPDM’s flexibility allows it to change shape with temperature without cracking or deteriorating. This is an important factor in regions with extreme temperature variations. Bitumen can become brittle over time, especially in cold climates, leading to cracking and potential leaks.

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Seamlessness

EPDM is available in large-sized sheets, meaning that fewer seams will be present on the roof. This reduces the likelihood of leaks and water infiltration. On the other hand, bitumen roofs, especially traditional BUR systems, have more seams, making them potentially more susceptible to leaks.

Fire Resistance

Bitumen roofing materials can vary with the fire resistance property. Some bitumen products are more fire-resistant than others. Moreover, fire codes can impact their use in certain applications. EPDM is mildly-fire-resistant, so fire safety regulations need to be put into practice.

Ease of Repair

Both EPDM and bitumen roofs can be repaired, but the process may differ. EPDM repairs involve patching the damaged area with compatible materials. Bitumen repairs may involve resealing seams, applying coatings, or replacing sections of the roof.

Conclusion

Whether EPDM is better than bitumen depends on the specific needs of a roofing project. EPDM offers superior durability, easy installation, minimal maintenance, and environmental benefits. While it may have a higher upfront cost, its extended lifespan and lower long-term maintenance needs can make it a cost-effective choice over time. Bitumen, with its lower initial cost, may be suitable for projects with budget constraints, but it may require more maintenance and replacements in the long run. Ultimately, the choice between EPDM and bitumen should consider factors such as climate, budget, maintenance capacity, and overall project goals. Consulting with roofing professionals and considering local conditions is essential to making an informed decision.

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