Our project has green roof around 28,000sqf on the total 68,000 roof area , and 2 row of 2'x2' pavers area (9074sqf )at the roof perimeter. Can we count the perimeter pavers as part of Vegetated roof?
We tried to use option 3 by counting the pavers ( higher than SRI 78) as a combination with the vegetated roof, however, the area of meeting SRI/ 0.75 + vegetated roof/0.5 is less than the total roof area. So the only hope we can get this SS7.2 LEED point is to count the perimeter paver area as part of vegetated roof area.
Please help. Thanks
Susan Walter
HDRLEEDuser Expert
1296 thumbs up
February 11, 2011 - 1:19 pm
First, check your form. I had a wonky form that would not calculate Option 3 accurately. In my case I knew the roof complied so it was obvious that the form was an issue. Otherwise, I would say no. Pavers are not plants. Have you excluded any mechanical equipment from the roof area? What about reducing one row of pavers and adding more plants? Conversely, add another row of pavers over the other roof material. Verify the form and use it to help you solve your calculations.
Michelle Halle Stern
PrincipalThe Green Facilitator
136 thumbs up
February 11, 2011 - 1:44 pm
By my math you are almost at 68,900 and should be ok with option 3. I always exclude pavers from green roof calculations and count them as reflective roof.
yongmei gao
44 thumbs up
February 11, 2011 - 1:44 pm
Susan, thanks for your response. Yes, I did deduct the mech. equipments, and I even deducted the parapets ( I assume it is belong to "appurtanence" ? ). You are right, single row of pavers shall be better, but I also calculated the number by using single row of pavers, we are still 1500sqf short for option 3. Also, I checked the form/ numbers for several times, and I will recheck it again if needed, but no way we can round of almost 2000sqf as required.
My question is for the vegetated roof, we need pavers to around them for maintainess purpose, and the pavers are working for green roof. If so, why can not be counted as " vegetated area" ?
Also, shall the canopy roof with a vestibule underneath be counted in total roof area?
yongmei gao
44 thumbs up
February 11, 2011 - 1:49 pm
Thanks Michelle, I found I typed numbers wrong after I posted.
The total green roof shall be 26,892, so 26,892/0.5+ 9074/ 0.75=65,882< total 68,683.