If asked what the most exciting or important feature of a building is, few people would answer: “the insulation in the roof.” You can’t see it, and it’s certainly not one of the items highlighted (like the marble entryway or glass curtainwall) when the building is promoted; however, as three new research papers indicate, insulation is, through its consistent and persistent performance, one of the most important components in a building when it comes to reducing energy costs and reducing carbon footprints.

A study from Bayer MaterialScience – Energy and Environmental Impact Reduction Opportunities for Existing Buildings with Low-Slope Roofs – shows that significant energy savings and carbon-dioxide emission reductions can be achieved through higher insulation levels in commercial roofs. According to the study, if 1.5 billion square feet of roofs are replaced for each of the next 5 years (for a total of 7.5 billion square feet of roofs):

• The energy saved over 5 years would be 0.08 quads (0.17 quads of source energy), and the 20-year cumulative energy saved from that 7.5 billion feet would be 0.47 quads (1.03 quads of source energy). One quad is equal to 1 quadrillion BTU (about 1 percent of the total U.S. energy consumption in 2005).
• The energy cost savings for the first 5 years would be $1.2 billion, and the cumulative energy cost savings over 20 years would be $10 billion.
• The reduction in carbon-dioxide emissions, based on source energy, over the first 5 years would be 12.2 million metric tons (MMT), and 73.5 MMT over the cumulative 20-year time period (73.5 MMT are equal to the carbon-dioxide emissions from an average coal-fired power plant over 16 years).

The Bayer report only considers the impact of roof replacements on existing buildings – upon which there are approximately 60 billion square feet of roof space; however, new legislation would cover new and existing buildings, which would result in benefits that Bayer estimates to be approximately 15- to 25-percent higher.

Another study – Environmental Effects Associated with Upgrading Roof Insulation Levels – completed by the Fuel Management Group, together with EBL Engineers for the Polyisocyanurate Insulation Manufacturers Association (PIMA), looks at the environmental effects associated with upgrading roof insulation from ASHRAE 90.1-2007 Energy Standard for Buildings Except Low-Rise Residential Buildings requirements to the proposed ASHRAE 189 Standard for the Design of High-Performance Green Buildings using polyisocyanurate roof insulation.

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