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2010 Oregon Manufactured Dwelling Installation Specialty Code <br /> walls, or structural skirting walls are used for (3) Perimeter piers may be recessed so the <br /> support, recessed perimeter piers are not bearing point of a concrete block or a <br /> kor required. prefabricated pier is no more than 12 in. from <br /> 3-9.2 Recessed Perimeter Piers. Recessed the perimeter of the manufactured dwelling. <br /> perimeter piers shall be listed or approved (4) Recessed perimeter piers shall be centered <br /> prefabricated foundation piers or rated CMU beneath the horizontal beams. <br /> piers installed according to the following: (5) A 4 in. x 4 in. horizontal wood beam or two 2 <br /> (1) On manufactured dwellings with transverse in. x 4 in. dimensional lumber nailed together <br /> floor systems (floor joists perpendicular to and placed on edge, spanning each floor <br /> the main frame), the recessed perimeter joist, shall be placed against the floor. <br /> piers shall support a single 4 in. x 4 in. (6) Recessed perimeter piers shall support the <br /> horizontal wood beam, or two 2 in. x 4 in. horizontal beams in a level position so that <br /> dimensional lumber nailed together, or the beam is tight against the bottom of each <br /> equal, spanning a minimum of two floor joist. <br /> transverse floor joists. See Figure 3-9.2(a). (7) Recessed <br /> (2) On manufactured dwellings with longitudinal perimeter piers shall provide a <br /> tight fit between the top of the pier and the <br /> floor systems (floor joists parallel with the bottom of the horizontal beams in a manner <br /> main frame), the recessed perimeter piers that does not allow rocking or other <br /> shall support the floor joists outside the main movement. <br /> frame. A 4 in. x 4 in. horizontal wood beam, <br /> or two 2 in. x 4 in. dimensional lumber nailed <br /> together, or equal, spanning each floor joist <br /> may be located on the outer side of the main <br /> frame. The beam shall fit tight against the <br /> [ bottom of the top flange of the main frame. <br /> See Figure 3-9.2(b). <br /> TYPICAL FLOOR SHEATHING wen„' <br /> . a ,m�,\``1 r f� <br /> PI <br /> F2WRVJOIS �„ / <br /> FLOOR JOIST <br /> N. <br /> ;` III hm <br /> ll�II$ I� RttPI AL <br /> JOIST <br /> IN <br /> 11'2Ii 12 in. MAXIMUM SETBACK <br /> 14 In. X 4 in. OR EQUAL ON III1II��I. FROM EDGE OF FLOOR <br /> EDGE SPANNING MINIMUM OF ' al <br /> III <br /> NO FLOOR JOISTS ✓ //' 11, <br /> AL IASILD OR APPROVED <br /> . dope <br /> /I ` PREFABRICATED PIER <br /> deeopin IKON <br /> eiel <br /> \ ,,, w TmrcAL FOOTING <br /> 4. <br /> Figure 3-9.2(a)Typical Recessed Pier Detail for Transverse Floors <br />