Ethylene propylene diene terpolymer (EPDM) is among the most cost-efficient roofing options for buildings with flat roofs. But this fact can be easily disregarded if you don’t choose the right installation method – and there are two available options.
Mechanically Fastened or Fully Adhered?
Mechanically fastened EPDM roofs are usually more common than fully adhered EPDM roofs. This is mostly due to the lower cost of materials and ease of installation. However, the mechanically fastened method poses a few challenges, such as fluttering or ballooning.
On a windy day, you can expect to find mechanically fastened EPDM roofs with no secondary air barrier to flutter. This usually happens because of air pressure differences, which pushes warm air from the building’s interior through the perforations or penetrations in the roof assembly. Because the warm air has already been exposed to the cool air outside, it would have to be reheated, causing a 5% to 8% increase in your heating costs.
Fully adhered EPDM roofing is less likely to cause such problems since the roof is directly glued to the insulation underneath. The insulation typically consists of boards that insulate and secure the roof to the deck. Opting for this method will cost you more money, and it will take more time. However, you can rest assured that your EPDM roof will be more resistant to leaks and high winds.
Location: An Essential Consideration
Mechanically fastened EPDM roofs aren’t all that bad, but they won’t perform well in coastal or high-wind regions. In such places, you would be able to benefit more from your EPDM roof if you use the fully adhered method. Consult with a local contractor to know the best choice for your building.
Safe Harbor Exteriors provides a range of services, including roof repair and replacement. If you need help with a wood shake roof, our team can handle the job. Call us at (913) 553-3620, or fill out our contact form to request a free quote. We offer our services to homeowners in Kansas City, MO, and Shawnee, KS.
