The Benefits of Green Roofs Part 6: Life Span of Roofing Membrane

One of the rarely mentioned benefits of installing a green roof is the extended life of the waterproofing membrane.   In today’s culture, too few looks at matters for the long term.   However, I have noticed over the last 10-15 years that long term building owners are most of the clients paying the initial premium associated with green roof installations, versus the installation of conventional gravel/ballasted or black roofs.  Clients such as, colleges/universities, hospitals and government building owners are implementing green roofs because of the long-term return on their investment, (ROI).  Typically, the (ROI) is 8-20 years.  They have this understanding, by way of running a cost-benefit analysis. 



It has been stated by many that the green roof membrane's life expectancy is extended anywhere from 2-4 times the typical 15-25 year warranty provided by regular membrane manufacturers.  So, the life of your green roof membrane could be between 30-50 years.  Of course, there are many factors which will determine that.  Green roofs in Berlin, Germany have shown they can protect roofs after 100 years, (Handbuch der Architektur, Berlin, 1889).  The green roofs of Rockefeller Center in New York City, for example, have had the same waterproofing membranes that were installed in the 1930’s.

The factors which are detrimental to a black or gravel roof are ultra-violet light, fluctuation in temperatures, wind, ice, snow and rain.   By having layers of fabric, soil and plants on top of the waterproofing, “blankets” the membrane, therefore protecting it from those elements.  It is buffered from temperature extremes and daily expansion and contraction of the roof materials.

This is the last blog post on green roofs for now, we hope to continue learning and growing with these beneficial practices!

Contact EQR:

As environmental construction experts for over 26 years, Environmental Quality Resources is proud of our mission of working outdoors to preserve and protect our watershed in a positive way.  Visit us online or give us a call at (410) -923-8680 to get more information and see if we are what you’re looking for. Looking to see what we are currently working on and more about our company?  Follow us on FacebookInstagramLinkedInTwitter, and YouTube!

CONNECT WITH US!

Over  28  years  of  experience

We are working to restore our watersheds and building a legacy in environmental construction

© 2019 by Environmental Quality Resources, LLC