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

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5 WALL SYSTEMS Wood Siding n Use decay-resistant wood such as redwood, cedar, or cypress. See the Sustainable Design section regarding certified wood. n To improve longevity of paint, back-prime wood siding before installation. n Carefully follow manufacturer’s detailing instructions to prevent excessive water intrusion behind the siding. n For attachment recommendations, see Natural Wood Siding: Selection, Installation and Finishing, published by the Western Wood Products Association. This publication recommends an air gap between the moisture barrier and the backside of the siding to promote drainage and ventilation. Such a wall configuration is referred to as a rain screen wall. See the text box on page 5. n Follow the installation details shown in Figures 8a and 8b. (Note: Although these details do not show a rain screen, inclusion of vertical furring strips to create a rain screen is recommended.) Figure 8a. Wood siding installation details. 4 of 8 12/10 Figure 7. The vinyl siding at this gable was installed over plastic foam insulation. Without wood sheathing, the wind pressures on the vinyl are increased. Also, if the siding blows away, the foam insulation is very vulnerable to blow-off. With loss of the foam insulation, wind-driven rain can freely enter the attic, saturate the ceiling insulation, and cause collapse of the ceiling. 5.3: SIDING INSTALLATION IN HIGH-WIND REGIONS HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION
Figure 8b. Wood siding installation details. Pressure-equalized rain screen wall system In areas that experience frequent wind-driven rain and areas susceptible to high winds, it is recommended that a rain screen design be considered when specifying wood or fiber cement siding. (Typical vinyl siding products inherently provide air cavities behind the siding that facilitate drainage. Therefore, incorporation of vertical furring strips is normally not applicable to this type of wall covering.) A rain screen design is accomplished by installing suitable vertical furring strips between the moisture barrier and siding material (see Figure 9). The cavity facilitates drainage of water from the space between the moisture barrier and backside of the siding and it facilitates drying of the siding and moisture barrier. Furring strip attachment: For 1 by 2 inches furring strips, tack strips in place and use siding nails that are 3/4 inch longer than would be required if there were no strips (to maintain the minimally required siding nail penetration into the studs). For thicker furring strips, an engineered attachment is recommended. At the bottom of the wall, the cavity should be open to allow water drainage. However, the opening should be screened to avoid insect entry. At the wall/soffit juncture, the top of the cavity can open into the attic space to provide inlet air ventilation, thereby, eliminating soffit vents and their susceptibility to wind-driven rain entry. If the rain screen cavity vent path is used instead of soffit vents, the depth of the cavity needs to be engineered to ensure that it provides sufficient air flow to ventilate the attic. 5.3: SIDING INSTALLATION IN HIGH-WIND REGIONS HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION Figure 9. Pressure-equalized rain screen system. Fiber Cement Siding n Installation procedures are similar to those for wood siding, but require specialized cutting blades and safety precautions because of the dust produced during cutting with power tools. Manufacturer’s installation recommendations should be strictly adhered to, and particular attention paid to the painting and finishing recommendations for a high-quality installation. n Always seal field-cut ends according to the manufacturer’s instructions. Properly gap the intersection between siding edges and other building components and fill the gap with sealant. 5 of 8 12/10 WALL SYSTEMS 5
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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
Page 49 and 50: Figure 5. An example of a wall cavi
Page 51 and 52: Moisture Barrier Systems HOME BUILD
Page 53 and 54: How Do Siting and Design Decisions
Page 55 and 56: Selecting a Lot and Siting the Buil
Page 57 and 58: Foundations in Coastal Areas HOME B
Page 59: prohibited in V Zones but are recom
Page 62 and 63: 3 FOUNDATIONS Table 1. Example foun
Page 64 and 65: 3 FOUNDATIONS Additional Resources
Page 66 and 67: 3 FOUNDATIONS 2 of 6 12/10 Figure 2
Page 68 and 69: 3 FOUNDATIONS 4 of 6 12/10 Figure 4
Page 70 and 71: 3 FOUNDATIONS Additional Resources
Page 72 and 73: 3 FOUNDATIONS Piers vs. Piles Pier
Page 75 and 76: HOME BUILDER’S GUIDE TO COASTAL C
Page 77: If a stemwall and floor slab system
Page 80 and 81: 4 LOAD PATHS If a connection fails,
Page 82 and 83: 4 LOAD PATHS Gable end wall - cut c
Page 85 and 86: Use of Connectors and Brackets HOME
Page 87 and 88: Important These are examples of typ
Page 89 and 90: Housewrap HOME BUILDER’S GUIDE TO
Page 91: 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: n Use aluminum, galvanized steel, o
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
Page 123: Common Sheathing Attachment Mistake
Page 126 and 127: 7 ROOFING 5. Apply a single layer o
Page 129 and 130: Asphalt Shingle Roofing for High Wi
Page 131: After the shingles have been expose
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 and 144: Gable Rake Vents Key Issues n Gable
Page 145 and 146: Metal Roof Systems in High-Wind Reg
Page 147 and 148: Construction Guidance n Consult loc
Page 149: Additional Resources For general in
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8 ATTACHMENTS Space Below the BFE
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8 ATTACHMENTS n Siding used on the
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Decks, Pools, and Accessory Structu
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uildings. Pools can be designed to
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Purpose: To identify the special co
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Fuel n Fuel tanks should be install
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9 REPAIRS n Pre-FIRM or post-FIRM b
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9 REPAIRS n If a lateral addition c
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9 REPAIRS Enclosures of Areas Below
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Repairs, Remodeling, Additions, and
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Vertical additions may also impose
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n Soffits should be inspected follo
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References and Resources HOME BUILD
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FEMA. NFIP Technical Bulletin 5-08,
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FEMA P-499: Home Builder's Guide to Coastal Construction

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