123 69TH PL SE 2018-01-02 MF Import

PNE PACIPIc NOR'I'Im t,sr ENGINI4-RIN(:, INC. Jul), 3.2010 Cornerstone Foundation System, LLC 140 Art Mill Lane Roseburg, OR 97470 Attn.: Norris Strauch Re.: "Smart Foundation R1354 System" Dear Norris, 'Iltc test data has been reviewed, and the necessary calculations have been performed. to prove the manufactured home foundation system produced by Cornerstone Foundation System, LLC called "Smart Foundation RB-54" (SF-RB54) is acceptable as a lateral force resisting system for wind zones 1.11, and .Il with a "C" exposure, and a seismic Site "D", Ss=1.5 Fa=-1.0, 11=5, lateral load. In addition, an 80 lb./ Sq. 17t. roof load and up to 30" lateral soil loads may be resisted simultaneously. SF-RB54 also meets or exceeds the design requirements of "poured in place" type foundation from the "Permanent Foundation Guidebook for Manufactured Housing" 4145.1 Rev. 2 and 4150.1 Rev. (1996) and c;so with the manufacturer pier point layout. The installation also meets or exceeds the design requirements of the f1UD-7584 Handbook. This allows the SF-RB54 to meet foundation certification for all }IUD, FHA and VA lending on Manufactured Housing, providing the SF RB-54 installation instructions are followed. The manufacturer of Cornerstone Foundation System has asked that the description of loads and structural values be presented in a way that is easy to understand with simple math, so it can be understood by those that do not have an engineering background. Perimeter Wail Sunnort Typical perimeter wall load requirements for manufactured homes arc 400 lb: 600 lb. per fin. foot. In situations where there arc windows four foot or larger each side of the window could be a point load requirement of 4000 lbs. support. In configuration of a lsrgc dormer and a large window combination the point load support needed could be as much as 6500 lbs. 4242 Silver Falls Dr. N., Sihcrton, OR. 97381 ph 0 (503) 873-3184 fax 9 (503) 873-.5907 P.E. 9 13,676