Under-slab Insulation SIPs The Laurance S. Rockefeller Preserve was designed as a model for environmental stewardship within the National Park System. The U.S. Green Building Council awarded Platinum LEED Certification, the highest level of achievement, to the Preserve. The Preserve reduced its energy costs by 78% compared to a typical building by choosing energy efficient systems such as R-Control SIPs, geothermal heating, and photovol

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