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M / • www.diamondpiers.cor � Diamond 253 858-8809 p \Ch Pier' 858-8607 f • Local Building Official Report Review Assistance—ESR Report .1.895, DP-50 Diamond Piers" We appreciate your taking the time in your schedule to review this newly recognized foundatic product for residential porches,decks. walkways and stairs. The Diamond Pier foundation has been u successfully for public works projects across the country since 1996. The DP-50 model,geared specifically for residential use,has many environmental advantages for the homeowner, and many scheduling and time advantages for the deck builder. The packet has been presented to you by a curre or future permit applicant to make sure you concur with the Evaluation Service's thorough review of t product under the code requirements of the RRC. The simple intention of the tent criteria devised by the Code Council to evaluate the Diamond i centers on the table for generic soil bearing values (IRC Table R401.4.1), which may he used"in lieu complete geotechnical evaluation" fol.your local soil conditions,just as you would for any convention deck. As you can see from the excerpt page of the Third Party Test Report, the load tests conducted o the piers, were done in soils with strengths matching the two lowest bearing categories of this table: 1: psf silts and clays, and 2000 psf sands and gravels. These tests confirmed that the DP-50 system perfo just like an ordinary, flat bottom, pad or cylinder footing,having a bearing area of 1.8 square feet. (Section 4.1 oftlw ESR Report) This capacity is equivalent to an 18"cylinder or 16" square concrete Footing. We know the Diamond Pies looks uique, and that it would seem to involve complicated Pile theory to analyze its performance. file reality though is that with very short stiffpiles, locked in the concrete head,the entire system pushes against the soil as one uit,gaining bearing strength from the engaged beneath the rigid, 4-way Pin frame. This Pin frame not only does all the bearing work, but it's deep spread configuration also ft:nctions like a bell shaped footing, providing an alternate to conventional heave protection,resisting fi rees of frost or expansive material. while upper soils cleave around and past the bottom of the diamc shaped head. In these soil zones, as indicated in the Manufacturer's Instructions,Pin length is based o providing sufficient resistance to heave pressures rather than reaching a specific vertical depth. With these features, the Diamond Pier can be used for porches, decks, or stairways attached to primary dwelling (Section 5.3 of the l.S'R Report). and can he inspected at any time during construction check for proper Pin length, and the installation of level, intact piers. if you have any questions about this report,please call David Pereg or Nick Stoklia at the ICC. 1-562-699-0543. extensions 3275 & 3283 respectively, or call Pin Foundations at 1-253-858-3844. Thank you. I'iN FOUNDATIONS INC 8607 58ih Ave NW Gig 1/arbor WA 98332 / .shipping: 2105 34''Ave NW Unit 30 Gig Harbw; WA