47.5 MB - The Whole Building Design Guide

Table 3-7: Recommendations for Remedial Work on Existing Critical FacilitiesWeaknessCritical facilities older than 5 years, or any age iflocated in an area with basic wind speed greater than90 mph.A building with weak non-load-bearing masonry orcurtain walls, poorly connected precast concrete panels,or weak long-span roof structures.Sectional and rolling doors.Worn window gaskets and sealants.Buildings in a hurricane-prone region where the basicwind speed is 100 mph or greater, with non-impactresistantexterior glazing.Recommended remedyPerform vulnerability assessment with life-safety issues asthe first priority, and property damage and interruption ofservice as the second priority.Implement remedial work on elements with insufficientstrength to resist wind loads if the facility will be occupiedduring high wind events (e.g., strong thunderstorms).Replace weak doors and tracks.Replace with new gaskets and sealants, or replace windowassembly.Replace with impact-resistant glazing or protect withshutters.Inadequately attached edge flashings or copings. Face-attach the vertical flanges. See Figure 3-63.Ballasted single-ply roof membranes.Buildings in a hurricane-prone region with aggregateroof surfacing, lightweight pavers, or cementitiouscoatedinsulation boards.Rooftop equipment unanchored or poorly anchored.Weak roof deck connections or weak roof structure.Emergency generators in a hurricane-prone region notadequately protected from wind-borne debris.Antennae (communication masts) in hurricane-proneregions.Lightning protection systems with adhesively-attachedconductor connectors or pronged splice connectorslocated in hurricane-prone regions where the basic windspeed is 100 mph or greater, or on critical facilities inexcess of 100 feet above grade.Take corrective action if non-compliant with ANSI/SPRI RP-4.Replace roof covering to avoid blow-off.Add screws or bolts to anchor equipment to curbs. Addcables to secure fan cowlings. Add latches to secureequipment access panels. See Section 3.3.4.1.When planning replacement of roof covering, remove roofcovering and strengthen attachment of deck and/or roofstructure. See Section 3.6.2.3.Build an enclosure to provide debris protection. SeeSection 3.4.5.1.Evaluate wind resistance and strengthen as needed. SeeChapter 15 and Appendix J of ANSI/TIA-222-G.Modify attachment according to recommendations inSection 3.4.4.3.3-146 MAKING CRITICAL FACILITIES SAFE FROM High Wind