To view this page ensure that Adobe Flash Player version 11.1.0 or greater is installed.

Energy-efficient Building with EIFS by Michael DeLaura, LEED AP Photos courtesy Sto Corp. AMONG THE EFFORTS TO CREATE MORE ENERGY-EFFICIENT AND SUSTAINABLE BUILDINGS, THERE HAS BEEN A SHIFT TOWARD LIGHTWEIGHT CLADDING OPTIONS FOR THE EXTERIOR. ONE SUCH PRODUCT IS EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS). EIFS provide a number of features and benefits including an air barrier, continuous insulation (ci), and an aesthetic finish. The assemblies trace their roots back to early 1950s Germany. Originally designed for commercial use, EIFS made their way into the residential market in Europe a decade later. Introduced into the United States in 1969, the product has evolved over the last 45 years. It gained popularity in the 1970s as a result of higher utility costs and the need to improve energy efficiency. The original product consisted of an adhesive applied with a notched trowel to form vertical ribbons that attach the expanded polystyrene (EPS) insulation board to the substrate. The EPS was then rasped or sanded before application of a base coat, which then had a fiberglass mesh embedded into it. The mesh is embedded into the basecoat over the entire surface of the EPS for reinforcement of the 20 the construction specifier | december 2013 CS_DECEMBER_2013.indd 20 2013-11-14 2:39 PM