47.5 MB - The Whole Building Design Guide

In conjunction with the rain-screen principle,it is desirable to avoid using sealantFurther information on the rain-screenprinciple can be found in the Nationalas the first or only line of defense againstInstitute of Building Sciences’ Buildingwater infiltration. When sealant joints areEnvelope Design Guide (www.wbdg.org/exposed, obtaining long-lasting watertightdesign/envelope.php).performance is difficult because of thecomplexities of sealant joint design and installation(see Figure 3-40, which shows the sealant protected by aremovable stop).Step 4: Peer ReviewIf the design team’s wind expertise and experience is limited,wind design input and/or peer review should be sought from aqualified individual. The design input or peer review could be arrangedfor the entire building, or for specific components such asthe roof or glazing systems, that are critical and beyond the designteam’s expertise.Regardless of the design team’s expertise and experience, peer reviewshould be considered when a critical facility:m Is located in an area where the basic wind speed is greaterthan 90 mph (peak gust)—particularly if the facility is ahospital, or will be used as an EOC or hurricane shelter.m Will incorporate a tornado shelter.3.3.1.3 Construction Contract AdministrationAfter a suitable design is complete, the design team should endeavorto ensure that the design intent is achieved duringconstruction. The key elements of construction contract administrationare submittal reviews and field observations, asdiscussed below.Submittal reviews: The specifications need to stipulate the submittalrequirements. This includes specifying what systems requiresubmittals (e.g., windows) and test data (where appropriate). Eachsubmittal should demonstrate the development of a load paththrough the system and into its supporting element. For example,3-40 MAKING CRITICAL FACILITIES SAFE FROM High Wind