What is the Difference Between EPDM and PVC?

EPDM (ethylene propylene diene monomer) and PVC (polyvinyl chloride) are two types of synthetic rubbers used in roofing membranes. They have some similarities, but there are key differences between the two materials:

1. Material Composition: EPDM is a synthetic rubber, while PVC is a thermoplastic. EPDM is made mostly of oil-based by-products with modifiers, and PVC is made from a lower percentage of oil and petroleum than EPDM.
2. Durability and Longevity: PVC is known for its strength and resistance to chemicals and pollutants, while EPDM is more flexible and has a longer lifespan. An EPDM roof is designed to last 12-25 years when properly installed, with some warranties covering up to 20 years for weatherability and factory defects. PVC, on the other hand, has been reported to last twice as long as EPDM.
3. Oil and Water Resistance: PVC is oil-resistant, while EPDM has subpar oil resistance. EPDM tends to have better water absorption resistance than PVC.
4. Temperature Performance: EPDM performs better in extreme cold temperatures, while PVC can become brittle when exposed to frigid temperatures and can even crack or break if exposed for extended periods.
5. Cost: EPDM is generally cheaper than PVC, with an average cost of $4.50 to $5.50 per square foot, while PVC can cost up to $12 per square foot. However, the price range for PVC can vary between $4 to $7 per square foot.

Both EPDM and PVC roofing systems have their pros and cons, and the choice between them depends on factors such as budget, environmental conditions, and specific needs. It is essential to consider these factors and consult with a professional roofing contractor to determine the best roofing system for your specific situation.

Comparative Table: EPDM vs PVC

EPDM (Ethylene Propylene Diene Monomer) and PVC (Poly-Vinyl Chloride) are widely used polymers. The key difference between EPDM and PVC is that EPDM is a synthetic rubber derived from petroleum byproducts, whereas PVC is a thermoplastic that can be melted down at high temperatures and molded into various shapes. Here is a table comparing the differences between EPDM and PVC:

EPDM is known for its excellent resistance to weathering and ozone, while PVC is recognized for its strength and resistance to impact. The choice between EPDM and PVC depends on the specific requirements of the application, such as the desired lifespan, weather resistance, and mechanical properties.