Our roof is 100% covered with White EPDM material. On top of that material are the HVAC units. There are also a couple of vents and a hatch opening for roof access. All these things add up to 56.5% of the roof area. Does this forfiet me from getting credit SS c 7.2? Since I do not have 75% of the roof clear of obstructions? Thanks.
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
August 30, 2010 - 4:39 pm
Appurtenances such as HVAC equipment, etc., can be excluded from the calculations. Good news for your project.
Paul C
164 thumbs up
September 10, 2010 - 9:57 am
Does this mean if the building 100' x 100' for example = 10,000 sq/ft total roof surface, you will use 10,000 sq/ft as your total roof sq/ft. even though your roof may only be really covered by 50% SRI membrane and the other 50% HVAC appurtenances, etc...??
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
September 10, 2010 - 11:30 am
When you're documenting this credit in LEED Online, the form asks you to provide total roof area "excluding mechanical equipment, photovoltaic panels, and skylights)." So, you're not entering total roof area, you're entering total roof area that is eligible for consideration under the credit. You're also uploading a roof plan and other documentation. Make sense?
Danna Sigal
PrincipalShlemmer+Algaze+Associates
27 thumbs up
September 13, 2010 - 1:21 pm
That makes perfect sense Tristan. What doesn't make sense is that when LEED asks for the SF (from LEED;Note that in the table below, 'Square footage' refers to the actual area of roof covered by the SRI surface) and then asks for "Total roof area (excluding mechanical equipment, photovoltaic panels, and skylights) (sf):"
and then I calculate I get a number of 243.55%. Because my the overall SF is 5932 sf and the number excluding the appurtenances is
2591.75 I come out with that strange number.
LEED's response was this;
Response: The information provided above indicates that the area of White EPDM (5932 sf) exceeds the total roof area (2591 sf). This information would indicate that the reported square footages may be incorrect and would indeed result in > 100%. Perhaps the numbers are switched? Also, please note that the calculation for the SRI compliant area is weighted based on the SRI value. Therefore, when using high SRI materials, it is possible that this calculation will demonstrate > 100% compliant roof area.
I guess what they are saying is that it is okay to have a 200+% number. Does that make any sense to you? If it does I have completed this credit.
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
September 15, 2010 - 11:10 am
You didn't mention your SRI values, but if they're higher than the minimum requirements, it's not surprising that the weighted value would generate a weird-looking percentage number.
Andrea Marzullo
LEED SpecialistOSC/CFEEA
30 thumbs up
October 3, 2011 - 1:07 pm
Just to be sure....table SSc7.2-1 asks for the total square footage of the reflective material. And THEN it asks for the total square footage of the roof MINUS the solar panels, skylights and mechanical equipment. I have entered in the relective material square footage which is a larger number than the square footage minus the appurtenances. And this will be okay? Shall I upload a spreadsheet with all the square footage numbers in it (total roof, roof minus LEED-allowed appurtenances, roof minus terrace and other "non-roof" surfaces, etc)?
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
November 14, 2011 - 10:10 pm
Andrea, I don't see how the SF of your reflective material could be larger than the SF of the applicable roof area. It implies that some of the area you are counting as appurtenances actually has relfective roofing on it. Or am I misunderstanding something?
Andrea Marzullo
LEED SpecialistOSC/CFEEA
30 thumbs up
November 15, 2011 - 1:06 pm
Exactly, Tristan. Our RTU-1 rooftop unit (5794 square feet) actually has the reflective roofing on it. I should be okay, right? I uploaded a very clearly labeled Google Earth map.
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
November 15, 2011 - 1:20 pm
Yes, that sounds okay. Hopefully everything is clear to the reviewer and you don't have any difficulties.