47.5 MB - The Whole Building Design Guide

Table 3-3: Risk Reduction Design Methods (continued)Roof Systems (continued) See Section 3.3.3.4Mechanically attached modified bitumen andsingle-ply membrane systemsRefer to Wind Design Guide for Mechanically AttachedFlexible Membrane Roofs, B1049 (NRCC, 2005).Metal panel systems See recommendations in Section 3.3.3.4.Parapet base flashingCalculate loads and resistance. This is particularly importantif base flashing is mechanically attached.Asphalt shingles and tile coverings See Fact Sheets 19, 20, or 21 in FEMA 499.Exterior-mounted Mechanical, Electrical, andCommunications EquipmentLoad resistanceEquipment strengthRooftop satellite dishesSee Section 3.3.4Specify anchorage of all rooftop and wall-mountedequipment. Use a safety factor of three for equipmentanchorage. See recommendations in Section 3.3.4.1.Specify cable tie-downs for fan cowlings. Specify haspsand locking devises for equipment access panels. Seerecommendations in Section 3.3.4.1.Design the attachment to resist the design wind loads.Antennae towers See recommendations in Section 3.3.4.2.After Completing Contract Documents See Section 3.3.1Peer reviewSubmittalsField observationsConsider peer review of contract documents. See Section3.3.1.2.Ensure required documents are submitted, includingall necessary information. Verify that each submittaldemonstrates the load path through the system and into itssupporting element. See Section 3.3.1.3.Analyze design to determine which elements are critical toensuring high-wind performance. Determine observationfrequency of critical elements. See Section 3.3.1.3.Post-occupancy inspections, maintenance, andrepairAdvise the building owner of the importance of periodicinspections, special inspections after unusually high winds,maintenance, and timely repair. See Section 3.3.1.4.MAKING CRITICAL FACILITIES SAFE FROM High Wind3-97