RIGID POLYISOCYANURATE INSULATION BOARD: Dow Building Solutions, a business unit of The Dow Chemical Co., www.dowbuildingsolutions. com
The portion of the total energy savings from the insulation alone is estimated to be $2,500 per 10 KSF building, or more than 20 percent in the Goodfellow AFB demonstration building.
with the appropriate joint closure system, polyiso insulation effectively blocks airfl ow, and the low perm rating helps to reduce moisture condensation within and behind the insulation. Also, the insulation, especially if it is taped, can provide a second layer of defense against any leaks from wind-driven rain through small gaps and holes. Building designers and owners will appreciate the ease of construction when specifying rigid
insulation as part of a retrofi t because lightweight insulation boards can be sawn or cut with a knife and then quickly installed on the structure. In addition to retrofi t construction,
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overview of the energy-reduction program at Goodfellow Air Force Base, San Angelo, Texas.
rigid insulation offers considerable advantages in new construction. In new metal building construction, often the most common way to insulate an open- purlin building roof or wall is to sandwich fi berglass batts between the metal roof and the metal purlins or girts. However, the compression of the insulation over the purlins or girts can substantially reduce the thermal effi ciency of this type of insulation system. The building used in the ESTCP demonstration project at Good- fellow AFB had this type of roof insulation in place on the existing roof before being retrofi tted.
As demonstrated on the ESTCP project,
part of the solution to reducing building energy consumption is simple: Install a continuous layer of a high-performance insulation that effectively minimizes any thermal shorts, reduces air leakage and delivers one of the highest R-values in the market. Combining the added insulation with a cool roof, rooftop photovoltaic electricity generation, and solar thermal water and air heating can allow building owners to signifi cantly reduce the cooling and heating energy in the structure. The military is discovering this with the ESTCP project at Goodfellow AFB.