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2010 Oregon Manufactured Dwelling Installation Specialty Code 3-2.5.4 Earthquake-Resistant Bracing. When the anchoring equipment shall be made required, manufactured dwellings shall be according to the equipment manufacturer's anchored or braced to resist seismic forces by instructions. any of the following: (b) Foundation footing U-Bar anchoring ties (1) Installing an approved earthquake-resistant shall be sized and the U-Bars spaced bracing system. according to the manufacturer's instructions. (2) Installing an approved anchoring system The mechanical connections of the designed to resist seismic conditions. anchoring ties shall be made according to (3) Installing positive connection piers at the the equipment manufacturer's instructions. main frame and anchoring with approved (A) In the absence of manufacturer's ground anchors. instructions, the U-Bar attachments shall be (4) Supporting and securing to a foundation installed 11 ft. on center and no more than wall, basement wall, or positive connection 12 in. from each end on both sides of the manufactured dwelling. piers. (5) Supporting and securing to an approved (B) Tie materials and strapping shall be capable structural skirting system designed to resist of resisting an allowable working load of seismic conditions. 3,150 lbs. with no more than two percent elongation, and shall withstand a 50 percent (6) Supporting and securing to a foundation overload. Tie-downs and ground anchors system capable of resisting seismic forces shall have protection against weather designed by a registered design professional deterioration and corrosion at least and approved by the building official. equivalent to that provided by a coating of 3-2.6 Anchoring. Anchoring of a manufactured zinc on steel of.30 oz./ft2 of surface coat. dwelling shall be according to the following. (c) Connector Plate anchoring: (1) The initial installation of all new (A) At least 3-1/2 in. x 7 in., 20 gage connector lbw manufactured dwellings shall be according to plates no more than 12 in. from each end on one of the following methods: both sides and 4 ft. on center for single wide (a) Installation of approved ground anchors that dwellings, and 5 ft. on center for multiple comply with all the requirements for Wind section dwellings. Zone I in 24 CFR 3285.402 contained within (B) Plates shall be fastened with a combined the manufacturer's installation instructions. total of 32 8d nails into the rim joist and (b) Structural attachment to a foundation foundation wall top plate. system, structural skirting, basement wall, or (d) Plywood trim board anchoring: footing when designed by a registered (A) Exterior type 15/32 in. grade B plywood at design professional and approved by the least 3-1/2 in. wide and continuous on both building official. See Section 3-2.6(2)(b) and sides of the dwelling. Figure 3-2.6 for examples of a typical approved anchoring systems. (B) Trim board shall be secured to the rim joist (c) An earthquake-resistant bracing system shall and the foundation wall top plate with 8d be installed at a maximum of 24 ft. on center nails 6 in. on center in each row and caulked and have a capacity of at least 5,000 lbs. in for weather seal. the lateral and longitudinal directions and 35,000 lbs. vertically, and are limited for use with multisection manufactured dwellings only having a roof slope of 20 degrees or less and supported on piers not greater than 24 in. in height. (2) The secondary installation of a manufactured dwelling shall be according to one of the following methods, see Figure 3-2.6: (a) Ground anchors shall be sized and spaced according to the equipment manufacturer's instructions. The mechanical connections of