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

Recommendations

Info

1 GENERAL Certification Breakaway Walls [see Fact Sheet Nos. 1.5, 8.1] (also see Enclosures Below BFE) NFIP 60.3(e)(5) Openings in Below-BFE Walls [see Fact Sheet Nos. 3.1, 3.5] (also see Enclosures Below BFE) NFIP 60.3(c)(5) Coastal Construction Requirements and Recommendations V Zone Coastal A Zone A Zone Requirement: Walls must be designed to break free under larger of the following allowable stress design loads: (1) design wind load, (2) design seismic load, or (3) 10 psf, acting perpendicular to the plane of the wall; if loading intended to cause collapse exceeds 20 psf using allowable stress design, the breakaway wall design shall be certified; when certification is required, a registered engineer or architect must certify that the walls will collapse under a water load associated with the Base Flood and that the elevated portion of the building and its foundation will not be subject to collapse, displacement, or lateral movement under simultaneous wind and water loads. Recommendation: Breakaway walls are recommended with an open foundation in lieu of solid walls; if breakaway walls are used and enclose an area, flood openings are required (see Fact Sheet Nos. 3.1, 3.5). Not Applicable Requirement: Unless the number and size of the openings meet regulatory requirements, a registered engineer or architect must certify that the openings are designed to automatically equalize hydrostatic forces on the walls by allowing automatic entry and exit of flood waters. Repairs, Remodeling, and Additions [See Fact Sheet No. 9.1] Substantial Improvements and Repairs of Substantial Damage NFIP 60.3(e)(5) and 60.3(c)(5) 6 of 10 12/10 Requirement: Must meet current NFIP requirements concerning new construction in V Zones except for siting landward of mean high tide (see Fact Sheet Nos. 1.4, 1.5, 2.2, 3.1, 3.5, 8.1, 8.3). Recommendation: Follow the V Zone requirement for building elevation and open foundations. Requirement: Must meet current NFIP requirements concerning new construction in A Zones (see Fact Sheet Nos. 1.4, 3.1, 3.5, 8.1, 8.3). Requirement: Unless the number and size of the openings meet regulatory requirements, a registered engineer or architect must certify that the openings are designed to automatically equalize hydrostatic forces on the walls by allowing automatic entry and exit of flood waters. Recommendation: Elevate bottom of lowest horizontal structural member to or above BFE. Requirement: Must meet current NFIP requirements concerning new construction in A Zones (see Fact Sheet Nos. 1.1, 3.1, 3.5, 8.1, 8.3) Additional Resources IBC: 1612.5 (2.3) IRC: R322.3.4 ASCE: ASCE 24 Sec. 4.6.1, 4.6.2, 2.6.1.1, ASCE 7 Sec. 5.3.3 Other: FEMA TB #5, FEMA TB #9 IBC: 1203.4.12, G1001.4 IRC: R322.2.2 ASCE: ASCE 24 Sec. 2.6.1, 2.6.2.1, 2.6.2.2 Other: FEMA TB #1 IBC: 1612.1, 1612.2, 3403.2, 3404.2, 3405.2, 3405.3, 3405.4 IRC: R322.1.6, R322.3.1 ASCE: ASCE 24 Sec. 4.3, ASCE 7 Sec. 1.6 Other: FEMA P-758 1.2: SUMMARY OF COASTAL CONSTRUCTION REQUIREMENTS AND RECOMMENDATIONS HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION
Coastal Construction Requirements and Recommendations V Zone Coastal A Zone A Zone Repairs, Remodeling, and Additions [See Fact Sheet No. 9.1] Lateral Additions That Constitute Substantial Improvement NFIP 60.3(e)(5) Lateral Additions That Do Not Constitute Substantial Improvement NFIP 60.3(e)(5) and 60.3(c)(5) Requirement: Both the addition and the existing building must meet current NFIP requirements concerning new construction in V Zones (see Fact Sheet Nos. 1.4, 1.5, 2.2, 3.1, 3.5, 8.1, 8.3). Recommendation: Make addition compliant with current NFIP requirements for V Zone construction. Requirements: Post-FIRM existing building – the addition must meet NFIP requirements in effect at time the building was originally constructed. Pre-FIRM existing building – NFIP requirements concerning new construction are not triggered (see Fact Sheet Nos. 1d, 1e, 2b, 3a, 3e, 8a, 8c) Recommendation: Follow V Zone requirement for building elevation and open foundations for the addition and the existing building. Requirement: Only additions must meet current NFIP requirements concerning new construction in A Zones (see Fact Sheet Nos. 1.4, 1.5, 3.1, 3.5, 8.1, 8.3), provided the existing building is not subject to any work other than cutting an entrance in a common wall and connecting the existing building to the addition; if any other work is done to the existing building it too must meet current NFIP requirements for new construction in A Zones. Recommendation: Follow V Zone requirement for building elevation and open foundations for the addition and the existing building. Requirements: Post-FIRM existing building – the addition must meet NFIP requirements in effect at the time the building was originally constructed (see Fact Sheet Nos. 1d, 1e, 2b, 3a, 3e, 8a, 8c). Pre- FIRM existing building -- NFIP requirements concerning new construction are not triggered. Recommendation: Elevate bottom of lowest structural member of the addition to or above BFE (same for the existing building if it is elevated). Requirement: Only additions must meet current NFIP requirements concerning new construction in A Zones (see Fact Sheet Nos. 1.4, 2.2, 3.1, 3.5, 8.1, 8.3), provided the existing building is not subject to any work other than cutting an entrance in a common wall and connecting the existing building to the addition; if any other work is done to the existing building it too must meet current NFIP requirements for new construction in A Zones. Recommendation: Elevate bottom of lowest horizontal structural member to or above BFE (same for existing building if it is elevated) (see Fact Sheet No. 1d) Requirements: Post-FIRM existing building – the addition must meet NFIP requirements in effect at the time the building was originally constructed (see Fact Sheet Nos. 1d, 1e, 2b, 3a, 3e, 8a, 8c). Pre- FIRM existing building -- NFIP requirements concerning new construction are not triggered. 1.2: SUMMARY OF COASTAL CONSTRUCTION REQUIREMENTS AND RECOMMENDATIONS Additional Resources IBC: 3403.2, 3412.2.3, 3405.3 IRC: R322.3.1 ASCE: ASCE 7 Sec. 1.6 Other: FEMA TB #1, FEMA TB #5, FEMA TB #9, FEMA 550 BC: 3403.2, 3412.2.3, 3405.3 IRC: R322.3.1 ASCE: ASCE 7 Sec. 1.6 Other: FEMA TB #1, FEMA TB #5, FEMA TB #9, FEMA 550 HOME BUILDER’S GUIDE TO COASTAL CONSTRUCTION 7 of 10 12/10 GENERAL 1
Page 1: Home Builder’s Guide to Coastal C
Page 4 and 5: G GUIDE 2 of 6 12/10 Fact Sheet No.
Page 6 and 7: G GUIDE 4 of 6 12/10 Fact Sheet No.
Page 8 and 9: G GUIDE 6 of 6 12/10 Category Categ
Page 10 and 11: 1 GENERAL What Should Owners and Ho
Page 13 and 14: Summary of Coastal Construction Req
Page 15 and 16: Foundation Orientation of Lowest Ho
Page 17: Certification Elevation NFIP 60.3(b
Page 21 and 22: Coastal Construction Requirements a
Page 23 and 24: Using a Digital Flood Insurance Rat
Page 25 and 26: Sample DFIRM This map is a portion
Page 27 and 28: Lowest Floor Elevation HOME BUILDER
Page 29 and 30: V Zone Design and Construction Cert
Page 31 and 32: Designing for Flood Levels Above th
Page 33 and 34: FIRMs depict the limits of flooding
Page 35 and 36: Figure 6. Mold and biological/chemi
Page 37 and 38: Other Considerations As previously
Page 39 and 40: Coastal Building Materials HOME BUI
Page 41 and 42: Location of Material Use Name of Ma
Page 43 and 44: n Metal-plate-connected trusses sho
Page 45 and 46: Non-Traditional Building Materials
Page 47 and 48: 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 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
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
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,
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?