The third turbulent zone is located over the roof, where the flow will "detach" from the roof along the leading edge and form a relatively shallow turbulent zone. The second is on the lee side, where the pressure is lower than in the undisturbed flow, producing suction on the leeward wall. In the first, located in front of the mobile home, the pressure is greater than in the undisturbed flow, creating inward force on the windward wall. As the air flow is deflected upwards over the roof, three turbulent zones are created (Figure 1). For simplicity, only the critical wind direction, at right angles to the longitudinal axis of a "single-wide" mobile home, will be considered. From this it will be possible to estimate the wind speed a mobile home can resist without anchorage and to suggest methods of tying it down.įor purposes of analysis the wind flow around a mobile home can be considered to be laminar. To appreciate wind effects on a mobile home, it is necessary to understand the pattern of air flow over the structure and the pressures and suctions produced by the flow. This, in spite of the fact that all new mobile homes manufactured under CSA Z240.2 are factory equipped with metal straps that run under the cladding over the top of the frame, ready to be hooked up to ground anchors. Unfortunately, it appears from inquiries with local building inspectors that anchorage requirements are often not enforced. Most codes, including the National Building Code 2 and the applicable CSA Standard, Z240.2, 3 contain requirements for anchoring mobile homes to the ground. One insurance company reported, for example, that in Nova Scotia from 1972 to 1974 it collected $260,000 in premiums from about 1800 mobile homes and that the losses, however caused, were $530,000. It is known, however, that wind losses are high in some areas. It is difficult to estimate the over-all economic consequence of this situation because, as stated by the Insurers' Advisory Organization in a report dated September 1976, 1 no separate records of wind losses are kept in Canada, wind losses being covered by general fire and extended coverage policies. This can result in the complete destruction of the unit and, frequently, injury to its occupants rather than the minor damage usually experienced in ordinary houses. Gusts in thunderstorms, for example, often produce winds sufficient to push an unanchored mobile home off its blocks and roll it over. Wind speeds capable of destroying mobile homes can and do occur in every part of Canada. It is a popular belief that wind damage to mobile homes is associated only with hurricanes and tornadoes, and that because these types of storms are not common in Canada there is no need to worry. The purpose of this Digest is to assess the nature of the wind loss problem, to describe the effects of the wind forces on a typical mobile home and to suggest methods of providing greater safety by anchoring mobile homes to the ground. Of all single detached homes constructed in Canada in 1974 21 per cent were mobile homes. It is estimated that there are now 200,000 mobile homes in Canada and that every year the mobile home population is increased by another 75 to 100,000 Canadians. As their numbers are increasing constantly, the problem "is serious and" growing. WormsZone.Home > Publications > Canadian Building Digests > CBD-188. Where does Wind come from? + more videos | #aumsum #kids #science #education #children How do you pull up the anchors in a mobile home? ![]() For single-wide homes vertical ties (on the roof area) required are two to four depending on the length of the home. In coastal areas four to seven per side are used to serve the greater need. ![]() ![]() The number of diagonal tie downs range from three to five per side in less storm danger areas. How many anchors should a mobile home have? The Earth contains five major wind zones: polar easterlies westerlies horse latitudes trade winds and the doldrums. Install Larger Doors (Exterior and Interior).Construction Upgrades That Make Your Manufactured Home Look More like a Site-Built Home.
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