EPDM roofing is a popular choice for flat and low-slope roofs due to its durability, flexibility, and long service life. EPDM stands for ethylene propylene diene monomer, a synthetic rubber that has performed reliably in the roofing industry for decades.
What is EPDM roofing?
EPDM roofing comes as sheet material in black or white. The typical thickness is 45 mils, 60 mils, or 80 mils, with white membranes offering higher reflectivity and potential energy savings. It is often installed on flat or low-slope roofs and remains flexible in extreme temperatures, reducing the risk of cracking.
Installation methods
Fully adhered
In a fully adhered system, the EPDM sheet is glued to a clean deck. This method provides a watertight seam, excellent wind uplift resistance in many climates, and a clean appearance. It is well suited for roofs with limited substrate movement but may require more time and skilled labor.
Mechanically attached
Mechanically attached EPDM uses fasteners and plates to secure the membrane. This approach can speed installation and work well on roofs with minor substrate movement, but wind uplift must be carefully engineered, and penetrations should be sealed properly.
Self adhered or loose laid
Self adhered EPDM uses adhesive backed sheets or rolls applied directly to the deck. This method is often faster and easier for DIY repairs, but it demands a clean, dry surface and precise detailing around edges and penetrations to prevent leaks.
Benefits and drawbacks
- Exceptional waterproofing and flexibility that accommodates building movement
- Long service life typically 30 to 50 years with proper maintenance
- Excellent resistance to ponding water, hail, and many weather conditions
- Energy efficiency options with white or reflective coatings
- Relatively easy seam repair and patching
- Lower material cost compared with some plastics, but labor costs vary
- Drawbacks include UV sensitivity if not protected, potential for punctures, and dependence on proper installation
Maintenance and lifespan
Regular roof inspections after storms, cleaning of debris, and sealing or patching of any seam or coating damage help maximize lifespan. Most EPDM roofs can reach 30 to 50 years, with correct maintenance and occasional recoating. White EPDM roofs reflect more solar heat, potentially reducing cooling costs in hot climates.
EPDM vs alternatives
| Material | Durability | Energy Efficiency | Installation | Typical Uses |
|---|---|---|---|---|
| EPDM | Very durable, flexible | Depends on color; white offers better reflectivity | Sheet membranes, various attachment methods | Flat and low-slope roofs |
| TPO | Very durable | Excellent UV reflectivity | Lightweight, often fast installation | Commercial flat roofs |
| PVC | Very durable, chemical resistant | Excellent reflectivity | Heavier, higher cost | Low-slope commercial |
| Modified Bitumen | Good | Moderate | Asphalt-based, requires torches or adhesives | Older flat roofs |
Cost considerations and choosing a contractor
Costs for EPDM roofing vary by thickness, membrane color, roof size, and the chosen installation method. Typical installed costs range from modest to mid-range for flat roofs, reflecting material quality, labor, and deck prep. When selecting a contractor, look for licensed roofing professionals with EPDM experience, strong references, and a clear warranty policy. A thorough site assessment, detailed written proposal, and post installation inspection are signs of a trustworthy contractor.
Conclusion
Summary: EPDM roofing provides durable, flexible protection for flat and low-slope roofs with excellent waterproofing and repairability. With proper installation and regular maintenance, EPDM can deliver decades of service, often outperforming alternative systems in budget-conscious applications. Choosing the right installation method, color, and reputable contractor is essential for long term performance.