47.5 MB - The Whole Building Design Guide

Adjustable jamb/head weatherstripping: This type of weatherstrippingis recommended because the wide sponge neoprene offersgood contact with the door (see Figure 3-37). The adjustmentfeature also helps to ensure good contact, provided the proper adjustmentis maintained.Meeting stile: At the meeting stile of pairs of doors, an overlappingastragal weatherstripping offers greater protection than weatherstrippingthat does not overlap.3.3.3.2 Windows and SkylightsThis section addresses general design considerations for exteriorwindows and skylights in critical facilities. For additional informationon windows and skylights in critical facilities located inhurricane-prone regions, see Section 3.4.3.2, and for those in tornado-proneregions, see Section 3.5.Figure 3-37:Adjustable jamb/headweatherstrippingLoads and ResistanceThe IBC requires that windows, curtain walls,For further general information on windows,and skylight assemblies (i.e., the glazing,see the National Institute of Buildingframe, and frame attachment to the wallSciences’ Building Envelope Design Guideor roof) have sufficient strength to resist(www.wbdg.org/design/envelope.php).the positive and negative design wind pressure(see Figure 3-38). Design professionalsshould specify that these assemblies complywith wind load testing in accordance with ASTM E 1233. It isimportant to specify an adequate load path and to check its continuityduring submittal review.Water InfiltrationHeavy rain accompanied by high winds can cause wind-drivenwater infiltration problems. The magnitude of the problemincreases with the wind speed. Leakage can occur at the glazing/frame interface, the frame itself, or between the frame and wall.When the basic wind speed is greater than 120 mph, because ofthe very high design wind pressures and numerous opportunitiesfor leakage path development, some leakage should be anticipatedwhen the design wind speed conditions are approached.MAKING CRITICAL FACILITIES SAFE FROM High Wind3-53