To increase the use of products and materials with life cycles and ingredients that improve overall environmental, economic and social performance.
* This credit language is drawn from the LEED v4 draft. Where other point totals are noted, this pilot credit is worth 1 point in total. *
Option 4. whole-building life-cycle assessment (3 points)
For new construction (buildings or portions of buildings), conduct a life-cycle assessment of the project’s structure and enclosure that demonstrates a minimum of 10% reduction, compared with a baseline building, in at least three of the six impact categories listed below, one of which must be global warming potential. No impact category assessed as part of the life-cycle assessment may increase by more than 5% compared with the baseline building.
The baseline and proposed buildings must be of comparable size, function, orientation, and operating energy performance as defined in EA Prerequisite Minimum Energy Performance. The service life of the baseline and proposed buildings must be the same and at least 60 years to fully account for maintenance and replacement. Use the same life-cycle assessment software tools and data sets to evaluate both the baseline building and the proposed building, and report all listed impact categories. Data sets must be compliant with ISO 14044.
Select at least three of the following impact categories for reduction:
- global warming potential (greenhouse gases), in CO2e;
- depletion of the stratospheric ozone layer, in kg CFC-11;
- acidification of land and water sources, in moles H+ or kg SO2;
- eutrophication, in kg nitrogen or kg phosphate;
- formation of tropospheric ozone, in kg NOx, kg O3, or kg ethene; and
- depletion of nonrenewable energy resources, in MJ.
- Participate in the LEEDuser pilot credit forum
- Complete the feedback survey:
The idea of this credit is to explore the holistic environmental impacts of material selection for structure and assembly. At a minimum submit summary life cycle inventory and assessment results for the materials and assemblies explored. As well as a comprehensive narrative outlining why the assemblies chosen were compared, any conclusions learned as part of the process, and any decisions made as a result of the study. If the project does not have an energy model ensure the same operational energy use is used in all assessments. The software tools approved for use in this pilot credit are the Athena Impact Estimator, GaBi, and SimaPro. If other tools are used please provide evidence that the tool meets the ISO requirements.
- What LCA database was used to conduct analysis? Why did you choose it? What did you think of the tool’s usability and technical rigor?
- Was obtaining product or brand specific LCIA data from manufactures difficult (or even possible)? Where there any other major hindrances to earning this credit?
- Do you think it is appropriate for this to be a design phase credit? Why or why not?
- Was the safety of alternative materials chosen a concern? Why or why not?
- Changes as a result of 3rd Public Comment (3/1/2012):
Former Option 1 and Option 2 completely removed.
Credit implementation strategy modified, intent remains the same.
- Changes as a result of 5th Public Comment (1/15/2013):
Modified to align with Building life-cycle impact reduction - Option 4
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