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(27s13‘ _TRc._ A BUILDING PLANNING di (z3k . l 1,--Fctthr ) o N 5 ground in crawl spaces or unexcavated area located R317.1.4 Wood columns. Wood columns shall be within the periphery of the building foundation. approved wood of natural decay resistance or approved All wood framing members that rest on concrete or 2. pressure-preservative-treated wood. masonry exterior foundation walls and are less than 8 Exceptions: Inches(203 mm)from the exposed ground. 1. Columns exposed to the weather or in basements 3. Sills and sleepers on a concrete or masonry slab that is when supported by concrete piers or metal pedes- in direct contact with the ground unless separated from lots projecting 1 inch(25.4 ram)above a concrete such slab by an impervious moisture barrier. floor or 6 inches (152 ram) above exposed earth and the earth is covered by an approved impervi- 4. The ends of wood girders entering exterior masonry or ous moisture barrier. concrete walls having clearances of less than Yt inch 2. Columns in enclosed crawl spaces or unexca- (12.7 mm)on tops,sides and ends. voted areas located within the periphery of the 5. Wood siding, sheathing and wall framing on the exte- building when supported by a concrete pier or nor of a building having a clearance of less than 6 metal pedestal at a height more than 8 inches inches(152 mm) from the ground or less than 2 inches (203 ram) from exposed earth and the earth is (51 mm) measured vertically from concrete steps, covered by an impervious moisture barrier. porch slabs,patio stabs,and similar horizontal surfaces R317.1.5 Exposed glued-laminated timbers. The par- exposed to the weather. lions of glued-laminated timbers that form the structural supports afa building or other structure and are exposed to 6. Wood structural members supporting moisture-perme- able floors or roofs that are exposed to the weather, weather and not properly protected by a roof,gave or sim- such as concrete or masonry slabs, unless separated liar covering shall be pressure treated with preservative,or be manufactured from naturally durable or preservative- from such floors or roofs by an impervious moisture barriec treated wood. 7. Wood furring strips or other wood framing members R317.2 Quality mark. Lumber and plywood required to be pressure-preservative-treated in accordance with Section attached directly to the interior of exterior masonryR318.1 n kW walls or concrete walls below grade except where an agency shall bear the qualitynuing mark supervision,f an approvedtesting and approved vapor retarder is applied between the wall agency that maintains continuing testing and and the furring strips or framing members. inspection over the quality of the product and that has been approved by an accreditation body that complies with the R317.1.1 Field treatment. Field-cut ends, notches and requirements of the American Lumber Standard Committee drilled holes of preservative-treated wood shall be treated treated wood program. in the field in accordance with AWPA M4. R3/7.2.2 Required information. The required quality R317.1.2 Ground contact.All wood in contact with the mark on each piece of pressure-preservative-treated lum- ground, embedded in concrete in direct contact with the ber or plywood shall contain the following information: ground or embedded in concrete exposed to the weather 1. Identification of the treating plant. that supports permanent structures intended for human occupancy shall be approvedpressure-preservative-treated 2. Type of preservative. wood suitable for ground contact use, except untreated 3. The minimum preservative retention. wood may be used where entirely below groundwater 4. End use for which the product was treated. level or continuously submerged in fresh water. 5. Standard to which the product was treated. R317.1.3 Geographical areas. In geographical areas where experience has demonstrated a specific need, 6. Identity of the approved inspection agency. approved naturally durable or pressure-preservative- 7. The designation'Dry,"if applicable. treated wood shall be used for those portions of wood Exception: Quality marls on lumber less than 1 inch members that form the structural supports of buildings, (25.4 mm)nominal thickness,or lumber less than nom- balconies,porches or similar permanent building appude- tool 1 inch by 5 inches (25,9 ram by 127 mm) or 2 nances when those members are exposed to the weather inches by 4 inches (51 mm by 102 ram) or lumber 36 without adequate protection from a roof,cave,overhang or inches (914 mm) or less in length shall be applied by other covering that would prevent moisture or water accu- stamping the faces of exterior pieces or by end labeling mutation on the surface or at joints between members. not less than 25 percent of the pieces of a bundled unit. Depending on local experience, such members may include: R317.3 Fasteners and connectors in contact with preser- vative-treated and fire-retardant-treated wood.Fasteners, 1. Horizontal members such as girders,joists and deck- including nuts and washers, and connectors in contact with ing. preservative-treated wood and fire-retardant-treated wood klIV 2. Vertical members such as posts,poles and columns. shall he in accordance with this section.The coating weights for zinc-coated fasteners shall be in accordance with ASTM 3. Both horizontal and vertical members. A 153. 66 2012 INTERNATIONAL RESIDENTIAL CODE'