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. C�oarypC 15 - 50 <br /> - c <br /> PACIFIC NORTHWEST ENGINEERING, INC. <br /> 1-0,M7 rELED <br /> Cornerstone Foundation System, LLC ,._;� <br /> 140 Art Mill Lane h'Ir,Y 1 An <br /> Roseburg, OR 97470 MARION COUNTY <br /> BUILDING INSPECTION <br /> Attn.: Non-is Strauch <br /> Re.: "Smart Foundation RB54 (&SFS-60)System" <br /> Design Criteria Verification <br /> Dear Norris, <br /> The test data has been reviewed, and the necessary calculations have been performed, <br /> proving the manufactured home foundation system produced by Cornerstone Foundation <br /> System, LLC called "Smart Foundation RB-54" (SFRB-54 and SFS-60) is acceptable as <br /> a lateral and vertical force resisting system for wind zones I, II, and III with a "C" <br /> exposure, and a seismic Site"D", Ss=1.384 Fa=-1.0, R=5, lateral load. In addition, an 60 <br /> lb./ Sq. Ft. roof load and up to 30" lateral soil loads may be resisted simultaneously. <br /> SFRB-54 and SFS-60 also meet or exceed the design requirements of"poured in place" <br /> type foundation from the "Permanent Foundation Guidebook for Manufactured Housing" <br /> 4145.1 Rev. 2 and 4150.1 Rev. (1996) and also with the manufacturer pier point layout. <br /> The installation also meets or exceeds the design requirements of the HUD-7584 <br /> Handbook. This allows the SFRB-54 and SFS-60 to meet foundation certification for all <br /> HUD, FHA and VA lending on Manufactured Housing,providing the SFRB-54 and SFS- <br /> 60 installation instructions are followed. It also meets or exceeds the requirements of <br /> Section 1333 Chapter 2, Title 25 of the California Administrative Code and 18551 of the <br /> Health and Safety Code. And it meets or exceeds the Oregon 2010 Manufactured <br /> Dwelling Installation Specialty Code. <br /> The following are the descriptions and calculations supporting our findings: <br /> Perimeter Wall Support for Gravity Loading <br /> Typical perimeter wall load requirements for manufactured homes are 400 lb.-720 lb. per <br /> lin. foot. (The maximum perimeter footing loads are calculated using a snow roof live <br /> load of 60 psf and a floor live load of 40 psf) In situations where there are windows, four <br /> foot or larger, each side of the window could have a point load requirement of 3,000 lbs. <br /> With the configuration of a large dormer and a large window combination, the point load <br /> support needed could be as much as 4,500 lbs. <br /> 11161 <br /> 4242 Silver Falls Dr. N., Silverton, OR. 97381 <br /> ph#(503) 873-3184 fax#(503) 873-3907 <br /> P.E.#13,676 <br />