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'SI I at"' PACIFIC NORTHWEST INC. ENGINEERING, Cornerstone Foundation System LLC July 13, 2018 140 Art Mill Lane Roseburg, OR 97471 PATENT No. US 9,109,355 BI Re: Design Criteria Verification "Smart Foundation" Running Bond 54 (SFRB-54), Ledge Stone 60(SFLS-60), Smooth 60 (SFS- 60), and "Poured in Place" Footing or "Poured Concrete Runners", Pre-cast Concrete PC-48 Footing (16" x 48" x 2 Va"), Pre-cast Concrete Masonry Unit Footing (CMU 16" x 16" x 4"), Composite Board Footing(1 'b"x 6")or Pressure Treated Lumber Footing(2" x 6"). Dear Norris, At the request of Cornerstone Foundation System LLC, Pacific Northwest Engineering has reviewed the empirical testing performed by Cornerstone Foundation System,as witnessed and documented by Umpqua Testing Services. It is my conclusion the test results and calculations prove that the"Smart Foundation"Rooming Bond 54 (SFRI3-54), Ledge Stone 60(SFLS-60), Smooth 60(SFS-60),and Pre-cast Concrete PC-48 Footing(16"x 48"x 2 %x'), Pre-cast Concrete Masonry Unit Footing (CMU 16" x 16" x 4"), Composite Board Footing (I 'G' x 6") or Pressure Treated Lumber Footing (2" x 6") when used in conjunction with Cornerstone Foundation System is acceptable as a tie down, perimeter pier and permanent foundation system, with a lateral and vertical force resisting system for wind zones [, II, and III with a"C"exposure and a seismic design category"DII", Ss=1.384, Fa=1.0, R=5 lateral load. In addition, an 801b./ Sq. Ft. roof load and up to a 30" lateral soil loads may be resisted 4 simultaneously. SFRB-54, SFS-60,and SFLS-60 also meet or exceed the design requirements of"poured in place" or "poured concrete runners" type fowrdation from the "Permanent Foundation Guidebook for manufactured !lousing"4145.1 Rev. 2 and 4150.1 Rev(1996)and also with the manufacturer pier point layout.The installation also meets or exceeds the design requirements of the HUD 7584 handbook. This allows the SFRB-54, SFLS-60 and SFS-60 to meet foundation certification for all HUD, FHA and VA lending on Manufactured Housing provided that the SFRB-54, SFLS-60 and SFS-60 installation instructions are followed. It also meets or exceeds the requirements of Section 1333, Chapter 2,Title 25 of the California Administrative Code and 18551 of the Health and Safety Code. Cornerstone Foundation System meets or exceeds the Oregon 2010 Manufactured Dwelling Installation Specialty Code and the Model Manufactured Housing Installation Standards. Cornerstone Foundation System can also be used in flood hazard areas except with composite hoard or pressure treated lumber footing which allows up to 40 lbs. roof load and 24"soil back fill. Test results and engineering calculations are available to authorities having jurisdiction when requested. ov Additional Information: , . Contact Person: Norrisa Ahlgren ,C - Cornerstone Foundation System LLC' ��r ' w" �1 Phone: (541)733-5441 ' Email. comerstonefoundationsystem tCi yahoo.com c WORK CORNERSIONIA3IYx' 4242 Silver Falls Dr. N.,Silverton,OR.97381 ph # (503) 873-3184 fax #(503)873-39(17 P.E. # 13,676 Page 4