47.5 MB - The Whole Building Design Guide

Table 3-3: Risk Reduction Design Methods (continued)Windows and Skylights See Section 3.3.3.2Glazing, frame, and frame fastenersWater infiltrationNon-Load-Bearing Walls, Wall Coverings,and SoffitsExterior non-load-bearing walls, wall coverings,soffits, and elevated floorsLoad resistanceElevator penthousesSoffitsMust be able to resist positive and negative design load,verified by ASTM E 1233 (2000) testing. Specify type, size,and spacing of frame fasteners.Carefully design junctures between walls and windows/curtain walls. Avoid relying on sealant as the first or onlyline of defense. Refer to ASTM E 2112 for design guidance.Where infiltration protection is demanding, conduct onsitewater infiltration testing per ASTM E 1105 (2000).See Section 3.3.3.3See recommendations in Section 3.3.3.3Must be able to resist positive and negative design load.Design as C&C.Design to prevent water infiltration at walls, roof, andmechanical penetrations.Design to resist wind and wind-driven water infiltration.Interior non-load-bearing masonry walls Design for wind load per Section 3.3.3.3.Brick veneer See recommendations in Section 3.3.3.3.Secondary protectionProvide moisture barrier underneath wall coverings that arewater-shedding.Roof Systems See Section 3.3.3.4TestingLoad resistance for field, perimeter, and cornerareasEdge flashings and copingsGuttersSystem selectionAvoid designs that deviate from a tested assembly. Ifdeviation is evident, perform rational analysis. For structuralmetal panel systems, test per ASTM E 1592 (2000).Specify requirements. See recommendations in Section3.3.3.4.Follow ANSI/SPRI ES-1 (2003). Use a safety factor of three.Calculate loads and design attachment to resist uplift.Select systems that offer high reliability, commensurate withthe wind-regime at facility location.3-96 MAKING CRITICAL FACILITIES SAFE FROM High Wind