47.5 MB - The Whole Building Design Guide

semblies with laminated glass assemblies, or installing permanentimpact resistant screens. Engineered films are also available for applicationto the interior of the glass. The film needs to be anchoredto the frame, and the frame needs to be adequately anchored tothe wall. The film degrades over time and requires replacement(approximately every decade). Use of laminated glass or shutters isrecommended in lieu of engineered films.3.6.2.3 Roof CoveringsFor roofs with weak metal edge flashing or coping attachment,face-attachment of the edge flashing/coping (as shown in Figure3-63) is a cost-effective approach to greatly improve the wind resistanceof the roof system.The vulnerability assessment of roofs ballasted with aggregate,pavers, or cementitious-coated insulation boards, should determinewhether the ballast complies with ASNI/SPRI RP-4.Corrective action is recommended for non-compliant, roof coverings.It is recommended that roof coverings with aggregatesurfacing, lightweight pavers, or cementitious-coated insulationboards on buildings located in hurricane-prone regions be replacedto avoid blow off (see Figure 3-114).Figure 3-114:Aggregate from thehospital’s built-up roofsbroke several windowsin the intensive care unit,which had to be evacuatedduring the hurricane.Hurricane Charley(Florida, 2004)MAKING CRITICAL FACILITIES SAFE FROM High Wind3-141