47.5 MB - The Whole Building Design Guide

Table 3-8: Checklist for Building Vulnerability of Critical Facilities Exposed to High Winds (continued)Vulnerability Sections Guidance ObservationsBuilding EnvelopeDoes the existing building haveoperable windows?Are there existing exterior non-loadbearingmasonry walls?Are there existing brick veneer, EIFS,or stucco exterior coverings?Are existing exterior walls resistant towind-borne debris?Are there existing ballasted single-plyroof membranes?Does the existing roof haveaggregate surfacing, lightweightpavers, or cementitious-coatedinsulation boards?Does the existing roof have edgeflashing or coping?Does the existing roof systemincorporate a secondary membrane?Does the existing building have a brittleroof covering, such as slate or tile?Section 3.3.3 (continued)If an older building, evaluate its wind-drivenrain resistance.If the building is in a hurricane- or tornadoproneregion, strengthen or replace.If the building is in a hurricane-prone region,evaluate attachments. To evaluate windresistance of EIFS, see ASTM E 2359 (2006).If the building is in a hurricane-prone region,consider enhancing debris resistance, particularlyif dealing with an important critical facility.Determine if they are in compliance with ANSI/SPRI RP-4. If non-compliant, take corrective action.If the building is in a hurricane- prone region,replace the roof covering to avoid blow-off.Evaluate the adequacy of the attachment.If not, and if the building is in a hurricane-proneregion, reroof and incorporate a secondarymembrane into the new system.If the building is in a hurricane-prone region,consider replacing with a non-brittle covering,particularly if it is an important critical facility.Exterior-Mounted Mechanical EquipmentIs there mechanical equipmentmounted outside at grade or theroof?Are there penetrations through theroof?Is the site in a hurricane-proneregion?Anchor the equipment to resist wind loads (Section3.3.4.1). If there is existing equipment,evaluate the adequacy of the attachment, includingattachment of cowlings and access panels.Design intakes and exhausts to avoid waterleakage (Section 3.3.4.1).If yes, place the equipment in a penthouse, ratherthan exposed on the roof (Section 3.4.4.2).MAKING CRITICAL FACILITIES SAFE FROM High Wind3-151