FEMA P-499: Home Builder's Guide to Coastal Construction

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7 ROOFING hole where the standpipe is installed. This will be easiest if the standpipe is larger than the hole and the cover can be attached to the sheathing in an area where the fasteners cannot be driven through the roof cover. Otherwise, it will be important to ensure that the fasteners are short enough that they will not extend through the roof sheathing and damage the roof cover. If the edge of the hole in the roof deck is flush with the inside edge of the standpipe, it may be possible to install metal straps that are screwed into the walls of the standpipe and attached with short screws to the bottom surface of the roof sheathing. Again, it is critical to use screws that are short enough that they will not extend through the roof sheathing and damage the roof cover. The strapping should be connected to the walls of the standpipe with short stainless steel sheet metal screws. Beyond any remedial measures taken to anchor the standpipe to the roof sheathing or to plug the hole from the attic side, it is also important to try and seal the standpipe from the outside so that water does not build up in the pipe and leak into the roof sheathing around the hole. The best approach is to have a qualified person remove the top active portion of the turbine vent before the storm and plug the hole at the top of the standpipe. A wooden plug can be used that covers the entire hole and has blocks that rest against the walls of the standpipe where screws can be installed to anchor the plug to the standpipe. Some homeowners have had the entire turbine wrapped in plastic to keep water out during a storm (Figure 14). This can work as long as the turbine or wrapping does not get dislodged. The smaller area provided by removing the turbine top and plugging the hole is considered preferable. 8 of 8 12/10 Figure 14. Plastic wrapped turbines. Developed in association with the National Association of Home Builders Research Center 7.5: MINIMIZING WATER INTRUSION THROUGH ROOF VENTS IN HIGH-WIND REGIONS HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION
Metal Roof Systems in High-Wind Regions HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION Technical Fact Sheet No. 7.6 Purpose: To describe practices for designing and installing metal roof systems that will enhance wind resistance in high-wind regions (i.e., greater than 90 miles per hour [mph] basic [gust design] wind speed). 1 Key Issues Damage investigations have revealed that some metal roofing systems have sufficient strength to resist extremely high winds (Figure 1), while other systems have blown off during winds that were well below design wind speeds given in ASCE 7. When metal roofing (or hip, ridge, or rake flashings) blows off during hurricanes, water may enter the building at displaced roofing; blown-off roofing can damage buildings and injure people. Here is general guidance for achieving successful wind performance: 1. Always follow the manufacturer’s installation instructions and local building code requirements. 2. Calculate loads on the roof assembly in accordance with ASCE 7 or the local building code, it is recommended to use whichever procedure results in the highest loads. 3. Specify/purchase a metal roof system that has sufficient uplift resistance to meet the design uplift loads. n For standing seam metal panel systems, the 2009 International Building Code (IBC) requires test methods UL 580 or ASTM E 1592. For standing seam systems, it is recommended that design professionals specify E 1592 testing, because it gives a better representation of the system’s uplift performance capability. n For safety factor determination, refer to Chapter F in standard NAS-01, published by the American Iron and Steel Institute. n For through-fastened steel panel systems, the IBC allows uplift resistance to be evaluated by testing or by calculations in accordance with standard NAS-01. 7.6: METAL ROOF SYSTEMS IN HIGH-WIND REGIONS Figure 1. This structural standing seam roof system survived Hurricane Andrew (Florida, 1992), but some hip flashings were blown off. The estimated wind speed was 170 mph (peak gust, at 33 feet for Exposure C). n For architectural panels with concealed clips, test method UL 580 is commonly used. However, it is recommended that design professionals specify ASTM E 1592 because it gives a better representation of the system’s uplift performance capability. When testing architectural panel systems via ASTM E 1592, the deck joints need to be unsealed in order to allow air flow to the underside of the metal panels. Therefore, underlayment should be eliminated from the test specimen, and a 1/8 inch minimum between deck panel side and end joints should be specified. n For safety factor determination, refer to Chapter F of the North American Specification for the Design of Cold-Formed Steel Structural Members (AISI S100-07). This fact sheet addresses wind and wind-driven rain issues. For general information on other aspects of metal roof system design and construction (including seam types, metal types, and finishes), see the “Additional Resources” section. 1 The 90 mph speed is based on ASCE 7-05. If ASCE 7-10 is being used, the equivalent wind speed is 116 mph for Risk Category II buildings. HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION 1 of 5 12/10 ROOFING 7
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Home Builder’s Guide to Coastal C
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G GUIDE 2 of 6 12/10 Fact Sheet No.
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G GUIDE 4 of 6 12/10 Fact Sheet No.
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G GUIDE 6 of 6 12/10 Category Categ
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1 GENERAL What Should Owners and Ho
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Summary of Coastal Construction Req
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Foundation Orientation of Lowest Ho
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Certification Elevation NFIP 60.3(b
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Coastal Construction Requirements a
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Coastal Construction Requirements a
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Using a Digital Flood Insurance Rat
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Sample DFIRM This map is a portion
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Lowest Floor Elevation HOME BUILDER
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V Zone Design and Construction Cert
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Designing for Flood Levels Above th
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FIRMs depict the limits of flooding
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Figure 6. Mold and biological/chemi
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Other Considerations As previously
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Coastal Building Materials HOME BUI
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Location of Material Use Name of Ma
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n Metal-plate-connected trusses sho
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Non-Traditional Building Materials
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Things to consider if building with
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Figure 5. An example of a wall cavi
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Moisture Barrier Systems HOME BUILD
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How Do Siting and Design Decisions
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Selecting a Lot and Siting the Buil
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Foundations in Coastal Areas HOME B
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prohibited in V Zones but are recom
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3 FOUNDATIONS Table 1. Example foun
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3 FOUNDATIONS Additional Resources
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3 FOUNDATIONS 2 of 6 12/10 Figure 2
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3 FOUNDATIONS 4 of 6 12/10 Figure 4
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3 FOUNDATIONS Additional Resources
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3 FOUNDATIONS Piers vs. Piles Pier
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HOME BUILDER’S GUIDE TO COASTAL C
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If a stemwall and floor slab system
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4 LOAD PATHS If a connection fails,
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4 LOAD PATHS Gable end wall - cut c
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Use of Connectors and Brackets HOME
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Important These are examples of typ
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Housewrap HOME BUILDER’S GUIDE TO
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n Improper integration with flashin
Page 94 and 95: 5 WALL SYSTEMS 2 of 3 12/10 Figure
Page 97 and 98: Siding Installation in High-Wind Re
Page 99 and 100: n Use aluminum, galvanized steel, o
Page 101 and 102: Figure 8b. Wood siding installation
Page 103 and 104: Energy Conservation and Air Barrier
Page 105 and 106: Attachment of Brick Veneer in High-
Page 107 and 108: Construction Guidance The brick ven
Page 109: Table 1. Brick Veneer Tie Spacing N
Page 112 and 113: 6 OPENINGS Although not discussed i
Page 115 and 116: Protection of Openings- Shutters an
Page 117 and 118: What Types of Shutters Are Availabl
Page 119 and 120: Are There Special Requirements for
Page 121 and 122: Roof Sheathing Installation HOME BU
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Page 129 and 130: Asphalt Shingle Roofing for High Wi
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Page 134 and 135: 7 ROOFING Design and Construction G
Page 137 and 138: Minimizing Water Intrusion Through
Page 139 and 140: Checking Soffit Material Installati
Page 141 and 142: Figure 8. This metal ridge vent was
Page 143: Gable Rake Vents Key Issues n Gable
Page 147 and 148: Construction Guidance n Consult loc
Page 149: Additional Resources For general in
Page 152 and 153: 8 ATTACHMENTS Space Below the BFE
Page 154 and 155: 8 ATTACHMENTS n Siding used on the
Page 157 and 158: Decks, Pools, and Accessory Structu
Page 159 and 160: uildings. Pools can be designed to
Page 161 and 162: Purpose: To identify the special co
Page 163: Fuel n Fuel tanks should be install
Page 166 and 167: 9 REPAIRS n Pre-FIRM or post-FIRM b
Page 168 and 169: 9 REPAIRS n If a lateral addition c
Page 170 and 171: 9 REPAIRS Enclosures of Areas Below
Page 173 and 174: Repairs, Remodeling, Additions, and
Page 175 and 176: Vertical additions may also impose
Page 177 and 178: n Soffits should be inspected follo
Page 179 and 180: References and Resources HOME BUILD
Page 181 and 182: FEMA. NFIP Technical Bulletin 5-08,
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FEMA P-499: Home Builder's Guide to Coastal Construction

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