Date
Thu Feb 23EPDM vs. PVC Roofing: Why Landmark Recommends Duro-Last for Flat Roofs
Many property owners searching for EPDM roofing or rubber roofing are exploring options for low-slope or flat commercial roofs. While EPDM has long been a popular choice, modern PVC systems—especially Duro-Last—offer significant advantages in durability, efficiency, and long-term performance.
At Landmark Roofing & Siding, we specialize in installing Duro-Last single-ply PVC roofing systems across the Puget Sound region. This article explains how EPDM works, where it falls short, and why Duro-Last PVC roofs are the superior choice for protecting your investment.
What Is EPDM Roofing?
EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber roofing membrane commonly used on low-slope and flat commercial buildings. It’s been a go-to option for decades thanks to its flexibility and affordability.
EPDM Roofing Overview
- Material: Synthetic rubber (black or white membrane)
- Common Use: Low-slope or flat commercial roofs
- Installation: Installed in large sheets—adhered, ballasted, or mechanically fastened
- Lifespan: 25–30 years when properly installed and maintained
EPDM’s track record is solid—but in today’s roofing landscape, better-performing and longer-lasting alternatives exist.
Advantages of EPDM Roofing
EPDM remains popular in certain climates and smaller commercial applications because of its:
- Proven 60+ year performance history
- Flexibility in cold weather conditions
- Resistance to UV rays and ozone exposure
- Relatively low upfront cost
While these qualities make EPDM an acceptable solution for some properties, it’s not always the best fit for the Pacific Northwest’s wet, variable weather.
Limitations of EPDM Roofing
Despite its longevity, EPDM’s weaknesses are hard to ignore—particularly for property owners seeking watertight protection in high-rainfall areas like Seattle, Redmond, and Bellevue.
- Seams are glued or taped, not heat-welded, leading to potential leak points over time.
- Black EPDM membranes absorb heat, raising building temperatures and energy costs.
- Adhesives degrade faster in wet or fluctuating climates.
- More prone to punctures from foot traffic or falling debris.
While it can last decades, EPDM often requires more maintenance and repairs compared to modern single-ply systems.
The PVC Advantage: Why Duro-Last Outperforms EPDM
PVC (polyvinyl chloride) roofing systems—especially Duro-Last single-ply membranes—have transformed how commercial and flat roofs are built. Unlike rubber-based materials, Duro-Last is a custom-fabricated PVC system engineered for precise fit, watertight performance, and low maintenance.
Why Duro-Last Is the Smarter Choice
- Custom-Fabricated Fit: Each roof is pre-measured and manufactured in a controlled environment, reducing on-site errors and installation time.
- Heat-Welded Seams: Unlike EPDM’s glued seams, Duro-Last seams are heat-fused for superior watertight strength.
- Energy Efficiency: The white reflective surface helps reduce cooling costs and heat absorption.
- Low Maintenance: Resistant to ponding water, chemicals, and debris.
- Comprehensive Warranties: Industry-leading manufacturer and workmanship warranties—often up to 30 years—backed by Landmark’s certified installation.
For building owners in the Puget Sound region, Duro-Last delivers unmatched protection against heavy rain, moss growth, and year-round moisture exposure.
EPDM vs. Duro-Last: A Side-by-Side Comparison
FEATURE | EPDM (Rubber Roofing) | DURO-LAST (PVC Roofing) |
Material Type | Synthetic Rubber | Polyvinyl Chloride (PVC) |
Seam Type | Glued or Taped | Heat-Welded (Fused) |
Energy Efficiency | Moderate | Excellent |
Water Resistance | Good | Superior |
Durability in Wet Climates | Fair | Excellent |
Maintenance Needs | Moderate | Minimal |
Warranty Coverage | 15–25 Years | Up to 30 Years (Material + Labor) |
Best For | Basic flat roof applications | Long-term waterproof performance |
Why Landmark Roofing & Siding Recommends Duro-Last
At Landmark Roofing & Siding, we’ve replaced countless aging EPDM and torch down roofs with Duro-Last PVC systems that perform far better in the Pacific Northwest climate. These installations offer our commercial clients:
- Longer service life and fewer leaks
- Reflective, energy-efficient performance
- Lower maintenance costs over time
- Proven manufacturer and workmanship warranties
Whether you manage an HOA, multi-building community, or light commercial property, Duro-Last provides exceptional long-term value and reliability.
Considering a Flat Roof Replacement?
If your property currently has an EPDM or rubber roof, upgrading to a Duro-Last PVC roofing system can deliver immediate and long-lasting benefits. Our team will assess your existing roof, provide a detailed proposal, and explain why Duro-Last may be the best long-term solution for your building.
EPDM Roofing FAQs
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How long does an EPDM roof last?
A properly installed EPDM roof can last 25 to 30 years with routine inspections and maintenance. However, its glued seams and rubber surface can wear faster in wet climates like the Pacific Northwest. Upgrading to a PVC system such as Duro-Last can extend the lifespan and reduce maintenance needs.
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Is EPDM the same as rubber roofing?
Yes. EPDM is a type of synthetic rubber roofing membrane commonly referred to as “rubber roofing.” It’s durable and flexible but uses adhesives to seal seams, which can weaken over time. Many modern contractors now prefer PVC systems that feature heat-welded seams for stronger, longer-lasting protection.
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Can I replace my EPDM roof with a Duro-Last PVC system?
Yes. In most cases, Duro-Last PVC membranes can be installed directly over an existing EPDM or torch down roof, saving time and disposal costs. This upgrade delivers better waterproofing, energy efficiency, and warranty coverage with minimal disruption.
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Is EPDM roofing good for the Pacific Northwest climate?
While EPDM performs well in many regions, it’s not ideal for the Pacific Northwest’s year-round rain and temperature fluctuations. The glued seams can weaken under constant moisture. PVC systems like Duro-Last, which use heat-welded seams, offer far superior waterproofing and long-term durability in this environment.
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Which is more expensive — EPDM or PVC roofing?
EPDM is generally less expensive upfront than PVC roofing, but the difference narrows when you factor in longevity and maintenance. PVC systems like Duro-Last typically cost a bit more to install, but their heat-welded seams, energy efficiency, and longer warranties provide greater value over time. For most commercial and flat-roof properties, the long-term savings and reliability of PVC outweigh the initial price difference.