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2010 Oregon Manufactured Dwelling Installation Specialty Code • Table 3-7.4 Pier Spacing 1,000 PSF 1,250 PSF 1,500 PSF 2,300 PSF Concrete (L Pier Spacing Soil Capacity Soil Capacity Soil Capacity Runner or Slab tier Main Frame Piers 4 ft.—6 in. 5ft.-6 in. 6 ft.—O in. 8ft.-0 in. --- Perimeter Sidewall Piers 4ft.-6 in 5ft.-6 in. Eft.-6 in. 8ft.—O in. Marriage Line Wall Piers 4ft. —6 in. 5ft.—6 in. 6 ft.—6 in. 8ft.—0 in. Marriage Line Floor Piers 8ft.—0 in. 8ft.—0 in. 8ft.—0 in. 8ft.—0 in. NOTES: (1) Pier spacing is based on 256 square inch footings. (2) Perimeter piers are required at both sides of all doors and at any opening 4 ft.wide or greater. (3)This table applies to the initial installation of homes having floors that are 14 ft. wide or less. Homes with floors over 14 ft. wide shall be installed according to the manufacturer's installation instructions. (4) For all secondary installations, piers shall be spaced according to this table. (5) Perimeter piers are required on all homes, except when the distance from the I-beam to the perimeter of the home is less than 16 in. 3-7.5 Concrete Block Pier Configuration. (1) 1 in. thick group 2 or 3 parallel laminated 3-7.5.1. Concrete block piers shall be installed in veneer wood plate; accordance with the following: Figure 3-7.2. (2) 1/4 in. or greater plywood; (1) The concrete blocks shall be stacked with (3) One 1-1/2 in. thick S-P-F (Spruce-Pine-Fir) their hollow cells aligned vertically. or better board lumber free of loose knots, (2) When piers are constructed of blocks splits, or other visual defects; stacked side by side, each layer shall be at (4) 3/4 in. thick S-P-F (Spruce-Pine-Fir)or better fir' right angles to the preceding one. board lumber free of loose knots, splits, or 3-8 Pier Caps, Shims and Wedges. other visual defects; 3-8.1 Pier Caps. Structural loads shall be evenly (5) 1-1/4 in. minimum thick wood polymer distributed across capped hollow block piers. composite; Material shall be equal in size to the pier blocks. (6) 4 in. x 6 in. wood beam; Piers shall be constructed from one of the (7) Listed and approved shimming material; or following: (8) Material or methods designed by a (1) A 4 in. nominally thick solid concrete block; registered design professional and approved (2) A 1 in. nominally thick group 2 or 3 parallel by the building official. laminated veneer wood plate; 3-8.3 Wedges. Wedges for CMU block (3) One piece of 1-1/4 in. plywood; foundation piers shall be made with one of the (4) Two pieces of 3/4 in. plywood; following materials, but shall not exceed a combined height of 9 in.: (5) One 1-1/2 in. thick S-P-F (Spruce-Pine-Fir) (1) Two sets of 3/4 in. thick by 3-1/2 in. wide by or better board lumber free of loose knots, gin. to 16 in. long wood wedges; splits, or other visual defects; (6) One 1-1/2 in. thick wood polymer composite; (2) One set of 1-1/2 in. thick by 3-1/2 in. wide by 8 in. to 16 in. long wood wedges; (7) Listed and approved prefabricated pier caps; (3) Listed or approved shimming material; or or (8) Material or methods designed by a (4) Material or methods designed by a registered design professional and approved registered design professional and approved by the building official. the building official. c3-8.2 Pier Shims. Pier shims for CMU block 3-9 Perimeter Piers. foundation piers shall be a minimum of 5-1/2 in. 3-9.1 Perimeter Piers. Perimeter piers may be x 16 in. constructed using any of the following recessed under the sidewalls, up to 12 in., to materials, but shall not exceed a combined allow room for skirting to be constructed or height of 9 in.: installed. When foundation walls, basement