FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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Volume II INSTALLING MECHANICAL EQUIPMENT AND UTILITIES 12 For curbs between 12 and 24 inches, two screws per side For curbs between 24 and 36 inches, three screws per side For buildings within 3,000 feet of the ocean, stainless steel screws For units that have flanges attached directly to the roof, #14 pan-head screws, a minimum of two screws per side, and a maximum spacing of 12 inches o.c. Air conditioning condenser units, 1/2-inch bolts at the four corners of base of each unit If the equipment is more than 30 inches above the curb, the attachment design should be based on calculated wind loads. ASCE 7-10 contains provisions for determining the horizontal and lateral force and the vertical uplift force on rooftop equipment for buildings with a mean roof height less than or equal to 60 feet. The lateral force is based on the vertical area of the equipment as projected on a vertical plane normal to the direction of the wind. The uplift force is based on the horizontal area of the equipment as projected on a horizontal plane above the equipment and parallel to the direction of the wind. Until equipment manufacturers produce more wind-resistant equipment, job-site strengthening of vent hoods is recommended. One approach is to use 1/8-inch-diameter stainless steel cables. Two or four cables are recommended, depending on design wind conditions. Alternatively, additional heavy straps can be screwed to the hood and curb. To avoid corrosion problems in equipment within 3,000 feet of the ocean shoreline (including sounds and backbays), nonferrous metal, such as aluminum, stainless steel, or steel with minimum G-90 hot-dip galvanized coating, is recommended for the equipment, equipment stands, and equipment anchors. Stainless steel fasteners are also recommended. See Section 11.6 for guidance regarding attic vents. 12.2.2 Flooding Flood damage to mechanical equipment is typically caused by the failure to elevate equipment sufficiently, as shown in Figure 12-1. Figure 12-2 shows proper elevation of an air-conditioning condenser in a floodprone area. Exterior-mounted mechanical equipment in one- to four-family buildings is normally limited to the following: Air-conditioning condensers Ductwork (air supply and return) Exhaust fans Pool filter motors Submersible well pumps Floodwaters can separate mechanical equipment from the supports and sever the connection to mechanical or electric COASTAL CONSTRUCTION MANUAL CROSS REFERENCE For additional information, see FEMA 348, Protecting Building Utilities From Flood Damage – Principles and Practices for the Design and Construction of Flood-Resistant Building Utility Systems (FEMA 1999), and Fact Sheet 8.3, Homebuilder’s Guide to Coastal Construction, in FEMA P-499 (FEMA 2010b). 12-3
12 INSTALLING MECHANICAL EQUIPMENT AND UTILITIES Volume II Figure 12-1. Condenser damaged as a result of insufficient elevation, Hurricane Georges (U.S. Gulf Coast, 1998) Figure 12-2. Proper elevation of an air-conditioning condenser in a floodprone area; additional anchorage is recommended 12-4 COASTAL CONSTRUCTION MANUAL
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Coastal Construction Manual Princip
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All illustrations in this document
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PREFACE Volume II Chapter 8 - Site-
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1 CHAPTER TITLE Contents COASTAL CO
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Volume II CONTENTS Chapter 9. Desig
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Volume II CONTENTS Chapter 11. Desi
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Volume II CONTENTS 12.5 Water and W
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Volume II CONTENTS 15.4.1 Evaluatin
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Volume II CONTENTS Figure 9-10. Roo
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Volume II CONTENTS Figure 11-3. Hou
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Volume II CONTENTS Figure 11-47. Da
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Volume II CONTENTS Chapter 15 Figur
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Volume II CONTENTS Table 10-9. Adva
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Volume II CONTENTS Example 8.4. Flo
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1 CHAPTER TITLE COASTAL CONSTRUCTIO
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Volume II PRE-DESIGN CONSIDERATIONS
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8 DETERMINING SITE-SPECIFIC LOADS V
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14 MAINTAINING THE BUILDING Volume
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14 MAINTAINING THE BUILDING Volume
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Volume II RETROFITTING BUILDINGS FO
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1 CHAPTER TITLE Acronyms COASTAL CO
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Volume II ACRONYMS H HMA Hazard Mit
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Volume II ACRONYMS T TMS The Masonr
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GLOSSARY Volume II Basement - Under
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GLOSSARY Volume II Conditions Great
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GLOSSARY Volume II F Federal Emerge
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GLOSSARY Volume II G Gabion - Rock-
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GLOSSARY Volume II Location - The l
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GLOSSARY Volume II O Open foundatio
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GLOSSARY Volume II Risk tolerance -
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GLOSSARY Volume II safe living cond
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GLOSSARY Volume II Z Zone A - Under
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INDEX Volume II Building envelope,
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INDEX Volume II stillwater flood de
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INDEX Volume II Floodborne debris d
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INDEX Volume II I IBHS (see Insuran
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INDEX Volume II date of constructio
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INDEX Volume II Seawall, 7-7, 7-17,
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INDEX Volume II velocity pressure,
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FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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