Ballasted roofs. How prevalent and how effective at energy efficiency are they?

I dont see a whole lot of these in my area.  Until recently I did not realize that they can be designed to meet 'Cool Roof'. specifications.

 

How many of these do you see in your area?  These are extremely heavy roofs with that much rock.

Views: 239

Reply to This

Replies to This Discussion

Found at the link Hal provided:  "A typical ballasted roof system consists of 10 pounds per square foot (49 kg/m2) of river-rock ballast over an EPDM membrane, rigid insulation and a metal roof deck."
I haven't seen one in years, generally we busy ripping them up & replacing them due to leaks & deterioration - personally I rather see a layer of insulation & a coating, and so would the owners when it comes time to repair or replace it

I agree with you.  I can't remember how long it has been since I have seen one even getting replaced.

 

Here we have the DOE setting standards for ballasted roofs so they can be considered a 'Cool Roof' also along with all the other types of roofs..  This would surely be considered a good thing if it is more energy efficient than a ballasted roof without the coating.  However, ( and speaking only for our roof coating)  there is absolutely NO WAY we would ever give a warranty for this specific application.  Rocks on top of our coating would not phase it's performance in the cold months but would definitrly drop its effectiveness in the hot months.

Spoke to the inventor of our coating yesterday.  He has not seen a ballasted roof in at least 20-years.

Anyone have any ideas where they are still used?????

Apperently ballasted roofs are still used in the UK and other parts of Europe as well as a few areas in the US.  News to me!

RSS

Latest Activity

Profile IconGregory GOrDon, Randall Olsen, Dan Kolbert and 20 more joined Home Energy Pros Forum
11 minutes ago
Diane Chojnowski replied to Diane Chojnowski's discussion Volunteers needed for Solar Decathlon 2017 - Denver, CO
"Check out the Volunteers page to find a role that fits…"
2 hours ago
Diane Chojnowski replied to Sonja Persram's discussion Energy Savings Guarantee for single family dwellings in cold climate??
"Here's info on Minnesota's GESP: https://www.cleanenergyresourceteams.org/gesp"
2 hours ago
Profile IconMatthew Richmond and Lee Morris joined Sean Lintow Sr's group
Thumbnail

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what…See More
2 hours ago
Lee Morris joined Diane Chojnowski's group
Thumbnail

Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
3 hours ago
Lee Morris joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
3 hours ago
Lee Morris joined Building Performance Institute's group
Thumbnail

Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization…See More
3 hours ago
Lee Morris joined Norm Bourassa's group
Thumbnail

Multifamily Buildings

For too long there has been relatively little EE focus on multifamily, but some new programs have…See More
3 hours ago

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service