EPS Newsline

ISSUE 5 | FALL 2014

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2 continued from cover Study Results • The best performing wall configuration with respect to positive heat flux during the cooling months (i.e. keeping heat out) was EIFS with towel-applied water-resistive barrier coating applied behind the EIFS ventilated wall. • The second best was the same EIFS wall configuration as the first best. • The best performing wall configuration with respect to moisture management was the EIFS panel with four inches of insulation outbound of the sheathing. The walls with stucco and brick showed high relative humidities at the insulation/gypsum interface during the winter months. • EIFS drainage layers comprised of vertical ribbons of adhesive and a fluid-applied moisture barrier provided the most effective method for managing bulk water intrusion into the cladding cavity. • EIFS with drainage and a liquid applied water- resistive barrier coating readily disperse liquid water and moisture introduced by flaws in the building envelope. • Liquid-applied water-resistive barrier coatings outperform sheet goods. In addition, EIFS with water-resistive barrier coatings performed significantly better than other claddings that used building paper or spun- bonded polyolefin membranes. The results of the ORNL study show that EIFS are more capable of controlling temperature and moisture within the wall system than the other exterior claddings that were evaluated. What's more, EIFS are better at striking and maintaining the fine balance of moisture and temperature control that is indicative of a well designed, properly operating and energy- efficient building. This high-performance and striking wall cladding system lowers overall life cycle impacts and delivers unparalleled energy efficiency and durability for today's sustainable building construction.

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