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<br />to improve the appearance of the manufactured <br />home. <br />Because floodwaters reach the perimeter <br />enclosure before the floor level of the home, the <br />design must take into account anticipated flood <br />forces, Commonly used enclosures are not de- <br />signed to resist flood or wind forces, The <br />enclosure. as shown in Figure 3,26, may be sub- <br />jected to either of these forces in addition to im- <br />pact from floating debris and must not transfer <br />these loads to the elevated foundation or the <br />manufactured home, Consequently, the design <br />must ensure that the enclosure disconnects dur, <br />ing flooding and does not transfer any forces to <br />the manufactured home or its foundation, <br /> <br /> <br /> <br />Figure 3.26 Perimeter Enclosure <br /> <br />Perimeter Walls -In areas with floodwater <br />velocity less than five feet per second (fps) and <br />where soil bearing capacity is adequate to sup- <br />port imposed loads, perimeter walls, as shown in <br />Figure 3,27, can be feasible. <br /> <br /> <br />Figure 3.27 Perimeter Walls <br /> <br />A perimeter wall is essentially an extended foun- <br />dation wall which acts as a deep beam in resisting <br />forces in the plane of the wall, From a structural <br />standpoint, the most important consideration is the <br />ability of the wall to resist lateral forces, For this <br />reason. the perimeter walls must provide a means <br />of allowing floodwaters to enter the enclosure, <br />thereby eliminating lateral loads, To minimize drag <br />forces, the walls should be parallel to anticipated <br />flood flow, <br />Supports for the manufactured home would be <br />horizontal beams, as previously discussed, located <br />across the span between the walls, As an option, <br />steel I-beams could be used, Note that the <br />manufacturer's recommended chassis I-beam <br />support spacings must not be exceeded and. <br />where required, perimeter blocking between the <br />manufactured home and perimeter wall must be <br />provided, <br /> <br />"AWCttORtNG <br /> <br />Conventional Tie-Down or Anchoring <br />Systems-Conventional tie,down or anchoring <br />systems are designed to resist the lateral and uplift <br />forces resulting from wind, The system is made <br />up of two distinct components, tie-downs (ties) and <br />anchors, There are two types of ties: (1) the over- <br />the-top tie as shown in Figure 3,28, and (2) the <br />frame tie as shown in Figure 3.29. <br /> <br /> <br />Figure 3.28 Over-the- Top Tie <br /> <br /> <br />Figure 3.29 Frame Tie <br /> <br />28 <br />