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2010 Oregon Manufactured Dwelling Installation Specialty Code CHAPTER 4 4-3 Foundation Walls. UNDER-FLOOR ENCLOSURES 4-3.1. Foundation walls may be used in place of ` 4-1 General. recessed perimeter piers, skirting, marriage line 4-1.1. All manufactured dwellings shall have the column support piers under the end walls, under-floor area enclosed with skirting installed anchoring, and to support the horizontal according to this code. Skirting is not required pressures of backfill around the manufactured for manufactured dwellings installed in flood dwelling. Foundation walls shall be constructed hazard areas. according to this code and where not specific, to the Oregon Residential Specialty Code. 4-2 Skirting Material. Concrete based foundation walls can hold up to 4-2.1. Skirting shall be constructed of a durable 48 in. of backfill. Lumber framed foundation rigid material such as painted wood, exterior walls can hold up to 36 in. of backfill. grade wood composites, exterior grade plywood, 4-3.2. Foundation walls, when used, shall be vinyl, aluminum, steel, foam, masonry, cement constructed according to the following and board, concrete or other material acceptable to Figures 4-3.2(a), 4-3.2(b) and 4-3.2(c): the building official. (1) Foundation walls shall be constructed of 4-2.2. Skirting shall meet the following: poured-in-place concrete, concrete masonry (1) Skirting materials shall be manufactured and units (CMUs), foundation grade lumber, intended for exterior use. insulated concrete forms, or an approved or (2) Non-structural skirting shall not be used to listed prefabricated perimeter foundation wall support any loads except as necessary to system. carry its own weight and to resist the (2) A minimum 6 in. thick, continuous concrete elements. footing, not less than 12 in. wide reinforced (3) Skirting shall be self-supporting but may be with two continuous minimum #4 attached to the bottom of the manufactured reinforcement rods. Rods shall be lapped 12 411/ dwelling floor for stability. in., connected with wire ties or equal, be 3 in. (4) Skirting shall be adequately secured to from the bottom of the footing, and not closer assure stability and to minimize vibration and than 3 in. from the edge of the footing. susceptibility to wind damage. (3) Foundation walls shall provide a tight fit to (5) Skirting shall be installed to compensate for the bottom of the manufactured dwelling possible frost heave and settling but is not floor framing. Shimming may be permitted required to have a footing located at or between outriggers and other permanent below the frost line. obstructions. (6) Holes or gaps below the skirting shall be (4) Foundation walls or footings shall be sealed to resist air and water infiltration. secured to the manufactured dwelling. (7) Skirting shall be designed to resist the (5) The stand shall be a minimum of 12 in. entrance of moisture and rodents into the above the base flood elevation (BFE) under-floor area. according to the Flood Insurance Rate Map (FIRM) unless the foundation wall is opened (8) Skirting transitions between the skirting and on one side or end so that floodwater cannot the bottom of the home shall be attached in be trapped. a manner that does not trap water between (6) All under-floor enclosures that retain over 8 the skirting and the home siding or trim. in. of backfill and where ground water may (9) The transition from the siding on the home to present a detrimental condition, one or more the skirting shall be weather sealed to of the following must be done and the prevent water migration behind the transition building official shall require any or all of the board or into the crawl space. following: (10) All under-floor enclosures that retain over 8 (a) Foundation walls water proofed around the L in. of backfill must be water proofed below perimeter of the manufactured dwelling; �/ grade around the perimeter of the home. (b) A perimeter drain around the foundation wall to divert water away from the manufactured dwelling; or