Why "next incremental percentage threshold" Doesn't Mean Anything
Exemplary performance points are an often overlooked component of possible IDc1 points. The good news about this is that they often come to you as a bonus points, which is always nice.
If you've taken the time to read your trusty reference guide (I'm reading from NCv2.2 first edition - damn right I'm old school!), the approach for determining exemplary performance reads as follows:
As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold.
Real Life LEED suggests you throw this advice out the door and just follow whatever it says under the "Exemplary Performance" section of the credit details. Every credit has this section in the reference guide, even if the credit in question doesn't have an exemplary performance option.
I've been struggling to find pictures for these post's lately, so I copped out and defaulted to motivational posters that only barely apply
"Incremental percentage threshold" is an interesting idea but doesn't really pan out to mean anything in practice. When you have 10%, 20%, X%, that X could easily be 30% (increasing by 10% each step) or 40% (doubling each step). For MRc4 Recycled Content it goes 10%, 20%, 30% and then for MRc5 Regional Materials (the very next credit!) it goes 10%, 20%, 40%... Go figure.
Similarly waste management would presumably go 50%, 75%, then 100%, but instead goes to 95% as it would be nearly impossible to achieve a 100% waste diversion rate. Finally, there are the credits where numbers aren't even a component or there's only one number to go by.
Lucky for you you're smart enough to read Real Life LEED, and I'm nice enough to provide you with a condensed list of the exemplary performance options and their thresholds right below! If a credit is not listed below that means there are no exemplary performance options available to you. This is based on LEED-NC 2.2 credits, and is just intended to be an at-a-glance guide you can paste on your cubicle.
HUMBLE PIE ALERT: Changes were made to the list of ID credits on 08/13/08 to reflect additional exemplary performance points found in CIR's and the errata sheets as well as to correct an error for SSc7.2.
- SSc2, Development Density and Community Connectivity
- The project itself must have a density of at least double that of the average density within the calculated area OR
- The average density within an area twice as large as that for the base credit achievement must be at least 120,000 sf/acre. To double the area, use equation 2 but double the property area first. The project must not lower the existing average density of the area.
- SSc4.1, Alternative Transportation, Public Transportation Access
- Project located within 1/2 mile of TWO rail lines OR within 1/4 mile of TWO or more stops for FOUR or more bus lines AND
- At least 200 transit rides per day are available at these stops. Combining bus and rail rides is allowable
- SSc4.1, 4,2, 4.3, and 4.4, Alternative Transportation
- Project must include a "comprehensive transportation management plan that demonstrates a quantifiable reduction in personal automobile use"
- SSc5.1, Site Development: Protect or Restore Habitat
- Restore or protect 75% of the site area
- SSc5.2, Site Development: Maximize Open Space
- Option 1 - Exceed zoning requirement by 50%
- Option 2 - Provide open space equal to double the building's footprint
- Option 3 - Provide open space for 40% of the site area
- SSc7.1, Heat Island Effect: Non-Roof
- 100% of parking under cover or "a minimum of 100%" of non-roof impervious surfaces meet requirements (high-albedo, open grid, or shaded within 5 years)
- SSc7.2, Heat Island Effect: Roof
- 100% of roof (excluding mechanical equipment) is a vegetated green-roof (not just high-albedo)
- WEc2, Innovative Wastewater Technologies
- 100% reduction in potable water use for sewage conveyance or 100% treatment of waste
- WEc3, Water Use Reduction
- 40% reduction in potable water use for regulated fixtures, or 10% reduction in process or other non-regulated water use
- EAc1, Optimize Energy Performance
- New buildings must exceed ASHRAE 90.1-2004 by at least 45.5%
- Existing buildings must exceed ASHRAE 90.1-2004 by at least 38.5%
- EAc2, On-Site Renewable Energy
- Renewable energy generated on-site must be 17.5% or greater of total energy used.
- EAc6, Green Power
- Double the amount of REC's purchased either by amount (70% of energy consumed) or time period (4 year contract). NOTE - this exemplary performance option was not listed in my hard-copy 1st edition manual, but is in the second edition.
- MRc2, Construction Waste Management
- Divert 95% of waste from the landfill
- MRc3, Materials Reuse
- 15% of materials must be reused
- MRc4, Recycled Content
- 30% of materials must be recycled
- MRc5, Regional Materials
- 40% of materials must be regional
- MRc6, Rapidly Renewable Materials
- 10% of materials must be renewable
- MRc7, Certified Wood
- 95% of wood must be FSC certified
- EQc8.1, Daylight and Views, Daylight 75% of Spaces
- Daylight 95% of spaces
- EQc8.2, Daylight and Views, Views for 90% of Spaces
- Eligible for exemplary performance, but there's no real guidance on what you need to do... "Projects will be evaluated on a case-by-case basis."
So there's 20 points you have to work with, though you're only allowed to use a max of four, and those are even fighting for space against your other innovation credits. The new LEED 2009 draft reduces you down to 3 exemplary performance options instead of 4, though overall there are now 6 Innovation and Design points available. They want to encourage actual innovation, so you will be limited to 3 EP points, 1 for having a LEED AP, and 2 others for innovation credits. You could have 5 innovation points and no exemplary performance, or 4 innovation and 1 exemplary, or 2 innovation and 3 exemplary, but not 1 innovation and 4 exemplary... There's more clarification on this issue in the comments below...
Did I miss something? Should I have checked the errata sheets before I posted this? Probably, but then again that's why blogs have comment sections!