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,tC NORt111yer^ <br /> irrlerat`G.v<. PACIFIC NORTHWEST NEST ENGINEERING, INC. <br /> Cornerstone Foundation System LLC' February I8, 2020 <br /> 140 Art Mill Lane <br /> Roseburg,OR 97471 <br /> PATENT No. US 9,109,355 B1 <br /> Re: Design Criteria Verification <br /> "Smart Foundation" Running Bond 54 (SFRB-54), Ledge Stone 60(SFLS-60), Smooth 60 (SFS- <br /> 60), and "Poured in Place" Footing or "Poured Concrete Runners", Pre-cast Concrete PC-48 <br /> Footing (16" x 48" x 2 37), Pre-cast Concrete Masonry Unit Footing (CMU 16" x 16' x 41, <br /> Composite Board Footing(I /4"x 6")or Pressure'Freated Lumber Footing (2"x 6"). <br /> Dear Norris, <br /> At the request of Cornerstone Foundation System EEC, Pacific Northwest Engineering has rev iewel the <br /> empirical testing performed by Cornerstone Foundation System, as witnessed and documented by Umpqua"Resting <br /> Services. It is my conclusion the test results and calculations prove that the -Smart Foundation" Running Bond 54 <br /> (SPR11-54), Ledge Stone 60 (SFLS-60), Smooth 60 (SFS-60), and Pre-cast Concrete PC-48 Fooling (16" x 48" x 2 <br /> SS'), Pre-cast Concrete Masonry Unit looting (CMU 16" x 16" x 4"), Composite Board Footing (( 14" x 6") or <br /> Pressure Treated Lumber Footing (2" x 6') when used in conjunction with Corrterxfonc Foundation System is <br /> acceptable as a lateral and vertical force resisting system for wind zones I, II, and III with a "C" exposure and a <br /> seismic design category"DIE', Ss=I.384, Fa=L0. R=5 lateral toad. to addition,an 801hi Sq. Ft. roof load and up to a <br /> 30" lateral soil loads may be resisted simultaneously.SPRB-54, SFS-60,and SFLS-60 also meet or exceed the design <br /> itio requirements of "poured in place" or "poured concrete runners" type foundation from the "Permanent Foundation <br /> Guidebook for manufactured Housing" 4145.1 Rev. 2 and 4150.1 Rev (1996) and also with the manufacturer pier <br /> point layout.The installation also meets or exceeds the design requirements of the IIUI) 7584 I landbook. This allows <br /> the SPRB-54. SFLS-60 and SFS-60 to meet foundation certification for all HUD, FHA and VA lending on <br /> Manufactured Housing provided that the SPRB-54,SFLS-60 and SES-60 installation instructions are tottowed. It also <br /> meets or exceeds the requirements of Section 1333, Chapter 2, Title 25 of the California Administrative Code and <br /> 18551 of the Health and Safety Code. Cornerstone Foundation System meets or exceeds the Oregon 2010 <br /> Manufactured Dwelling Installation Specialty Code and the Model Manufactured [lousing Installation Standards. <br /> Cornerstone Foundation System can also he used in flood hazard areas except with composite (ward or pressure <br /> treated lumber footing which allows up to 40 lbs roof load and 24"soil back fill. <br /> lesst results and engineering calculations are available to authorities having jurisdiction when requested. <br /> Mark Ellingson, PE <br /> • <br /> AddContact <br /> son: Nation: <br /> Contact Person: Norris S[rtmch <br /> Cornerstone Foundation System LLC it <br /> Phone: (541) 733-5441 <br /> Email: cornerstonefoundationsystem(uryahoo.com <br /> uacan Lim;ci na„i.. <br /> 4242 Silver Falls Dr. N., Silverton,OR. 97381 <br /> ph # (503) 873-3184 fax II (5113) 873-3907 <br /> P.E.8 13,676 <br /> Page 5 of 13 <br />