47.5 MB - The Whole Building Design Guide

To avoid water leaking into the building, it is important that weepholes be adequately spaced and not be blocked during brick installation,and that through-wall flashings be properly designedand installed. At the hospital shown in Figure 3-52, water leakedinto the building along the base of many of the brick veneer walls.When high winds accompany heavy rain, a substantial amount ofwater can be blown into the wall cavity.Figure 3-52:Water leaked inside alongthe base of the brickveneer walls. HurricaneKatrina (Louisiana, 2005)EIFS: Figure 3-53 shows typical EIFS assemblies. Figures 3-41, 3-54,and 4-6 show EIFS blow-off. In these cases, the molded expandedpolystyrene (MEPS) was attached to gypsum board, which in turnwas attached to metal studs. The gypsum board detached fromthe studs, which is a common EIFS failure. When the gypsumboard on the exterior side of the studs is blown away, it is commonfor gypsum board on the interior side to also be blown off. Theopening allows the building to become fully pressurized and allowsthe entrance of wind-driven rain. Other common types of failureinclude wall framing failure, separation of the MEPS from its substrate,and separation of the synthetic stucco from the MEPS.3-64 MAKING CRITICAL FACILITIES SAFE FROM High Wind