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: 207

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

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

R Higgins replied to William Fisher's discussion Can tankless water heaters provide hot water even when the groundwater is fairly cold?
"Hi John Love your attention to detail, too many base decisions on 'what they've…"
22 minutes ago
Al Heath replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"My favorite was 2x4 directly on cement basement wall, with fiberglass, then plastic inside of…"
6 hours ago
John Nicholas replied to William Fisher's discussion Can tankless water heaters provide hot water even when the groundwater is fairly cold?
"Simple math will tell you.   Figure the GPM requirements for each fixture you think will run…"
8 hours ago
R Higgins replied to William Fisher's discussion Can tankless water heaters provide hot water even when the groundwater is fairly cold?
"I have that problem, 45 to 50 degree ground water, in summer, not that we have much of a…"
17 hours ago
R Higgins replied to Larry Schaffert's discussion How to correctly insulate exterior wall in a 1900 house?
"I'd suggest trying to replicate the existing conditions as much as possible in your rebuild,…"
17 hours ago
Bryan Pringle replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"I am getting a lot of "bad idea" push back on this.  I fully understand that…"
yesterday
Greg Mitchell commented on Larry Ralph Jr's blog post Top 7 Worst Crawl Space Repairs
"Spray Foam should be used in crawlspaces.   To learn about closed cell foam in crawlspaces…"
yesterday
Jerry Lawrence posted events
Friday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service