Windstorm Protection and Wind Zone Designation

Windstorm Protection and Wind Zone Designation A. All new and used Factory-Built homes shall be installed in compliance with the set- up/installation instructions manual, in accordance with Federal Manufactured Home Construction and Safety Standards, 24 CFR Section 3280.306, (Windstorm protection) as follows: (a) Provisions for support and anchoring systems. Each Factory-Built home shall have provisions for support/anchoring or foundation systems that, when properly designed and installed, will resist overturning and lateral movement (sliding) of the Factory-Built home as imposed by the respective design loads. For Wind Zone I, the design wind loads to be used for calculating resistance to overturning and lateral movement shall be the simultaneous application of the wind loads indicated in Section 3280.305 (1)(i), increased by a factor of 1.5. The 1.5 factor of safety for Wind Zone I is also applied simultaneously to both the vertical building projection, as horizontal wind load, and across the surface of the full roof structure, as uplift loading. For Wind Zones II and III, the resistance shall be determined by the simultaneous application of the horizontal drag and uplift wind loads, in accordance with Section 3280.305 (c)(1)(ii). The basic allowable stresses of materials required to resist overturning and lateral movement shall not be increased in the design and proportioning of these members. No additional shape or location factors need to be applied in the design of the tie down system. The dead load of the structure may be used to resist these wind loading effects in all Wind Zones. B. Used Factory-Built homes, as defined in this chapter, not provided with such set- up/installation instruction manuals, and not provided with instructions shall comply with the specifications listed under Rule 5.06, Mississippi Factory-Built Home Installation Program Standards, infra. C. Factory-Built homes, both new and used, built after July 13, 1994, that conform to Wind Zone I ratings only, cannot be installed within a designated Wind Zone II area. The wind Zone II area for homes manufactured after July 13, 1994, consists of the following counties: Hancock, Harrison, Jackson, George, Pearl River and Stone. D. For used Factory-Built homes that were built prior to July 13, 1994, the following shall apply: If the Factory-Built home was built to the HUD Hurricane Zone rating that existed prior to July 13, 1994, it may be installed in one of the post July 13, 1994, counties that are listed in (C) above. For reference, HUD designated Hurricane Zone counties that existed prior to July 13, 1994, were as follows: Hancock, Harrison, Jackson, George, Pear River, Stone, Greene, Perry, Forrest, Lamar, Marion, Walthall, Pike, Amite, and Wilkinson. However, if the LAHJ within the post-July 13, 1994, Wind Zone II area has adopted more restrictive requirements that would prohibit the installation of a pre-July 13, 1994, Hurricane Zone house, then the requirements of such county or municipality shall govern. E. Prior to the sales and installation of all new and used Factory-Built homes, the retailer, the developer and/or the installer/transporter shall determine whether the house is constructed to the properly rated Wind/Hurricane zone for its intended use and installation by referring to the HUD data plate. Any Factory-Built Home that is to be transported within or into the six (6) coastal counties of the State (Pearl River, Stone, George, Hancock, Harrison, and Jackson County) for installation, the retailer, the developer and/or installer transporter will be required to obtain a photocopy or a clear photograph of the data plate for the home. The photograph or copy of the data plate must be attached to the Property Locator/Certificate of Installation and submitted to the Factory-Built Home Division. If no accessible or readable data plate is available in the home to verify the Wind/Hurricane zone designation, a copy of the HUD data plate and compliance certificate must be obtained either from the manufacturer of the home or from the Institute for Building Technology and Safety (IBTS).