06/12/2012

Give EPDM a Second Life

Extend your EPDM roofing system’s lifetime with these fixes

By Richard L. Fricklas

 
  • /Portals/1/images/OnlineImages/2012/1212/EPDM_seaming.jpg

    Early systems for joining side and end laps of sheets required multiple steps by skilled roofers.

  • /Portals/1/images/OnlineImages/2012/1212/EPDM_tjoints.jpg

    A T-joint, where three layers of membrane come together, is vulnerable to moisture penetration.

  • /Portals/1/images/OnlineImages/2012/1212/EPDM_joint.jpg

    If you have an older EPDM roof system, try centering a piece of self-adhering membrane over the T void during renovations.

  • /Portals/1/images/OnlineImages/2012/1212/EPDM_shrinkage.jpg

    Ballasted EPDM membranes sometimes shrink at penetrations and roof perimeters.

  • /Portals/1/images/OnlineImages/2012/1212/EPDM_batten.jpg

    An adhered system that has become detached can sometimes be re-anchored with a mechanically fastened system installed in an approved pattern. Cover fasteners or battens with a fresh strip of membrane afterward.

  • /Portals/1/images/OnlineImages/2012/1212/EPDM_fascia.jpg

    Today’s metal edgings capitalize on the flexibility of single-ply roofing materials. Modern edge details now show turning the roof membrane down over the fascia, then installing a raised metal fascia cover.

Elastomeric roofing based upon ethylene propylene diene terpolymer (EPDM) has been around for more than four decades and can claim 500,000 warranted roofs consisting of 20 billion square feet in place.

If one of these roof systems are on your buildings, you may not need a costly roof replacement just yet. Examine your roof to see if any of these EPDM fixes will work for you.

The Components of EPDM Roof Systems
Elastomers
are defined as macromolecular materials that return rapidly to their approximate initial dimensions and shape after subsequent release of stress.

In contrast, thermoplastic materials will deform when stressed but not fully recover when the stress is removed. Thermoplastics include polymers such as polypropylene, polyvinyl chloride (PVC), chlorinated polyethylene, ketone ethylene ester (KEE) and chlorosulfonated polyethylene (Hypalon, which crosslinks upon weather exposure). Thermoplastic materials can be joined together (usually by heat welding), unlike elastomers, which cannot be heat welded.

EPDM combines two thermoplastics, ethylene and propylene, with a diene that permits the ethylene-propylene chains to be crosslinked. During vulcanization, this converts the properties of a roof membrane from a weldable thermoplastic to an inert, long-life, heat resistant elastomer.

During the early 1960s, these elastomeric properties were achieved through vulcanization of polymers such as natural rubber, butyl, neoprene, styrene butadiene rubber (SBR), chlorobutyl, polyepichlorohydrin, silicone, and other polymers. However, it has been demonstrated that only EPDM possessed the necessary combination of properties for long roof life and cost efficiency, confirmed by many roof systems that are still in service after 30 years or more.

As with the tires on our automobiles, carbon-black reinforced EPDM membranes have proven to have extraordinary weather, UV, and ozone resistance as well as enhanced physical properties. While white pigmented EPDM is available, indications are that the black material is, and will be, more resistant to UV attack over its long life.


Pages: 1  2  3  View All  
 

Need portable cooling?

Rent or buy spot coolers from full-service locations nationwide. On call “24/7”. Primary, supplemental or emergency cooling. Atlas Sales & Rentals, Inc., or call (800) 972-6600.

Click here for more info


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

Bluebeam® Revu® simplifies digital facilities document management from design review to leveraging as-builts, maintenance manuals and O&Ms submittals.

Yaskawa drives offer quality performance for air handlers and cooling towers on the roof to secondary chilled water pumps in the basement

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Need portable cooling?

Rent or buy spot coolers from full-service locations nationwide. On call “24/7”. Primary, supplemental or emergency cooling. Atlas Sales & Rentals, Inc., or call (800) 972-6600.

Click here for more info


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

Bluebeam® Revu® simplifies digital facilities document management from design review to leveraging as-builts, maintenance manuals and O&Ms submittals.

Yaskawa drives offer quality performance for air handlers and cooling towers on the roof to secondary chilled water pumps in the basement

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


 
comments powered by Disqus

Related Products

Sponsored Links