Wooden lattice will break more readily when struck by floating debris. It won’t break, and will collect a large amount of debris causing the wave action force to be transmitted to the entire building. Plastic lattice is much too durable for below flood applications in type "V" and "Coastal A" flood zones.Exterior siding is extended down to cover breakaway walls. ![]() Free from obstructions: If there’s something big installed next to such a wall - freezer, refrigerator, heavy shelving etc, it’ll prevent the wall from breaking-away.Interior finishes makes these walls harder to break-away, and encourage occupancy where prohibited. Inside is finished: Breakaway walls are considered expendable, for the greater good of the building.These walls can’t break-away as designed if pipes and wires will tie them to the building. No utilities can be attached to or through these walls, such as: pipes, electrical wiring etc.Construction / Inspectionīreakaway wall inspections often fail for these reasons: Once these walls break-away, the water rolls back and forth under the building between the columns, exerting very little force upon the building. If these walls didn’t break-away, the forces against them would be transmitted to the entire building, which could cause it to collapse. (V-Zone Certification form.) Purpose of the Walls These breakaway walls must be designed and certified by an Engineer to certain pressure tolerances, so when violent waters hit these walls they break-away from the building. "V" zones are located along or near coastlines, where the "velocity" from breaking waves is considered most destructive, and where building codes have higher standards. However, these areas must have breakaway walls and flood vents. 60.In type "V" and "Coastal A" flood zones, enclosed areas below flood levels may be used to for minimal storage, parking and access to upper levels. ![]() 60.0 - Criteria for Land Management and Use.National Flood Insurance Program Requirements Designs to meet this criteria must be certified by a registered design professional or meet certain minimum criteria for breakaway walls. ![]() In V Zones, the space below the lowest floor of a building shall be free of obstruction or constructed with non-supporting breakaway walls, open wood lattice work, or insect screening intended to collapse under wind and water loads without causing collapse, displacement, or other structural damage to the elevated portion of the building or supporting foundation system. ![]() Designs must meet certain minimum criteria for openings in the enclosure walls or be certified by a registered design professional. In A Zones, fully enclosed areas below the lowest floor must be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing the entry and exit of floodwaters. Flood insurance coverage for enclosures below the BFE is very limited. Enclosed areas below the lowest floor must be adequately anchored, built using flood resistant building material, and any utilities or service facilities must be designed and/or located to prevent flood damage. Enclosures below the Base Flood Elevation (BFE) may only be used for building access, vehicle parking, and storage. Enclosures are enclosed walled in areas below the lowest floor of an elevated building.
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