This strengthening of the walls (i.e., by using extra fasteners) so that they do not break away before damaging the structure may occur during initial construction or as a result of laterĢ Breakaway Wall Designs Screening. Construction of walls stronger than the structural frame of the building was designed to stand will jeopardize the integrity of the structure under storm conditions. Walls providing this protection from the elements can be designed to withstand certain wind and water loads and to break away or fail when design loads are exceeded. While screening and lattice provide some protection for vehicles and stored items from salt spray and other environmental conditions, full protection from the elements can only be provided by a solid wall. Lattice work is often used for architectural purposes as shown by figure 4-60, to visually tie the house to its surroundings. These walls provide partial protection and security for items stored under an elevated structure. Screening and lattice work are the best low strength enclosures and when properly constructed can serve their intended function with little effect on the structural loadings on the house. maximum wind and water loading values to be used in this determination shall each have a 1% chance of being equaled or exceeded in any given year (100 year mean recurrence interval) The uses that owners make of the sheltered space beneath elevated homes has historically led to a wide range of enclosure designs, from insect screening to heavy conventional walls. In either case, the designer must certify both of the following: Breakaway wall collapse shall result from a water load less than that which would occur during the base flood The elevated portion of the building and supporting foundation system shall not be subject to collapse, displacement, or other structural damage due to the effects of wind and water loads acting simultaneously on all building components (structural and nonstructural). The need for greater loading resistance could be a result of design requirements or required by local or state codes. The regulations allow walls with a greater loading resistance under certain conditions, and when the design is certified by a registered professional engineer or architect. ![]() To ensure that breakaway walls withstand forces from wind and everyday use, yet collapse under storm conditions, current NFIP regulations require that a breakaway wall shall have a design safe loading resistance of not less than 10 and no more than 20 pounds per square foot. ![]() A breakaway wall is a wall that is not part of the structural support of the building, intended through its design and construction to collapse under specific lateral (wind and water) loading conditions without causing collapse, displacement, or other structural damage to the elevated portion of the building or supporting foundation system. Uses such as parking of vehicles, building access, or storage are permitted, as long as the walls of any enclosures are designed as "breakaway". In recognition of the desirability of using the sheltered space beneath elevated structures, NFIP regulations permit certain limited uses of enclosed space below the BFE. ![]() When the space below the lowest elevated floor is maintained free of solid obstructions as well, the potential for damage from waves or debris is further reduced. 1 Breakaway Walls Elevation of a structure on a properly designed foundation reduces the potential for water damage from flooding.
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