47.5 MB - The Whole Building Design Guide

spread in both of those storms. Prior to the1991 edition of the SBC and UBC, and the1990 edition of the NBC, these model codeswere essentially silent on roof covering windloads and test methods for determininguplift resistance. Code improvements continuedto be made through the 2006 editionof the IBC, which added a provision thatprohibits aggregate roof surfaces in hurricane-proneregions.Glazing protection: The 2000 edition of theIBC was the first model code to addresswind-borne debris requirements for glazingin buildings located in hurricane-prone regions(via reference to the 1998 edition ofASCE 7). The 1995 edition of ASCE 7 wasthe first edition to address wind-borne debrisrequirements.ASCE 7 requires impact-resistant glazing inwind-borne debris regions within hurricaneproneregions. Impact-resistant glazing caneither be laminated glass, polycarbonate,or shutters tested in accordance withstandards specified in ASCE 7. Thewind-borne debris load criteria weredeveloped to minimize property damageand to improve building performance. Thecriteria were not developed for occupantprotection. Where occupant protection isa specific criterion, the more conservativewind-borne debris criteria given in FEMA361, Design and Construction Guidancefor Community Shelters is recommended.Parapets and rooftop equipment: The 2003 edition of the IBC wasthe first model code to address wind loads on parapets androoftop equipment (via reference to the 2002 edition of ASCE 7,which was the first edition of ASCE 7 to address these elements).3.1.4.2 Effectiveness and Limitations of BuildingCodesA key element of an effective building code is for a community tohave an effective building department. Building safety depends onmore than the codes and the standards they reference. Buildingsafety results when trained professionals have the resources andongoing support they need to stay on top of the latest advancementsin building safety. An effective building safety systemprovides uniform code interpretations, product evaluations, andprofessional development and certification for inspectors andplan reviewers. Local building departments play an important rolein helping to ensure buildings are designed and constructed inaccordance with the applicable building codes. Meaningful planreview and inspection by the building department are particularlyimportant for critical facilities.MAKING CRITICAL FACILITIES SAFE FROM High Wind3-19