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: 230

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!



  • Add Videos
  • View All


Latest Activity

Debra Little posted a video

Building Carbon Zero 2015, PHCA

Building Carbon Zero 2015. Passive House CA with City of Palo Alto 2015 summit. Produced by Debra Little. Shot on iPhone 5. Everyone can make videos with the tools in your back pocket!
3 hours ago
Home Energy Magazine's blog post was featured
12 hours ago
Profile IconDave Chamberlain, angela stanzione and Bruce Zahn joined Home Energy Pros
13 hours ago
Paul Holder added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase

Blower Door frame

Looking for a blower door frame for Minneapolis blower door. Needing a 2nd. frame if anyone has one…See More
17 hours ago
Joe Urycki replied to Joe Urycki's discussion TEC blower door and UEI combustion analyzer for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Yes, I do still have the equipment.  Are you interested in it?"
Amber Vignieri commented on Amber Vignieri's blog post Even with Polar Vortex, Hourly Pricing Participants Saved
"Thanks for your comment Bob! We couldn't be more excited about the increasing prevalence of…"
Home Energy Magazine posted a blog post
Noah Ray Sanders replied to Steve Mann's discussion TEC Blower Door Frame in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"If so please contact me 8329717862 or email"

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service