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SSc1 - Plan for green site and building exterior management
LEED BD+C: Data Centers, LEED BD+C: Hospitality, LEED O+M: Existing Buildings, LEED O+M: Schools, LEED O+M: Retail
Clarify the use of magnesium chloride deicers in LEED. Specifically, identify when it should be used, safety issues relating to the use of all deicers, and if there is an alternative approach to meeti...
Clarify the use of magnesium chloride deicers in LEED. Specifically, identify when it should be used, safety issues relating to the use of all deicers, and if there is an alternative approach to meeting the credit requirements.
Projects may use the following compliance path to achieve the deicer portion of snow and ice removal requirements for SS Credit 2: Building Exterior and Hardscape Management Plan.
1. Demonstrate that the total application area has been reduced by 50%. Hardscape areas like parking lots, sidewalks, pedestrian travel areas and circulation routes should be considered and cannot be included for the application area reduction.
Use a Calcium Magnesium Acetate (CMA) deicer, or a mix that contains a minimum of 30% CMA. If that is not possible, explain the circumstances and use deicer products that contain no greater than 5% of Sodium Chloride (NaCl) or Calcium Chloride (CaCl) in their applied state.
2. Identify the salt-sensitive areas on the site and apply 4 of the following 8 principles of sound snow and ice best management practices:
- For manually applied deicing products, use calibrated spreaders to apply products as recommended by the manufacturer’s label instructions.
- Identify snow piling locations on the site and push snow into those areas to minimize sheet runoff and refreezing problems.
- All salt spreading vehicles should be equipped with electronic spreader controls. These instruments allow the operator to control both the amount and location of the salt spread.
- When appropriate, install infrared thermometers in the vehicles to provide fast, accurate pavement and air temperatures.
- Use prewetted salt whenever possible, as an alternative to dry salt.
- Keep records of salt use and its effect for each and every snow event. Trial and error is one effective way to learn optimum salt usage.
- Seek out and use weather forecasting and tracking information for your local region, paying particular attention to pavement temperature.
- Keep up to date on alternative chemicals and blends (such as calcium magnesium acetate) that are environmental friendly by attending professional conferences and workshops and by sharing information with other professionals.
***Updated 1/1/13 to: (1) remove the alternative weighted average approach; (2) add guidance on the baseline for the 50% reduction of application area; (3) clarify the use of CMA and CMA blends; (4) clarify the percentage of NaCl and CaCl; and (5) expand upon sound snow and ice best management practices.
Related Addenda (Corrections & Interpretations)