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Home My WebLink About10022003 BSC Agenda Item 8 R321.2.3-R323.1 4111 BUILDING PLANNING lower roof to the underside of the higher roof deck shall R321.3.1.2 Penetration firestop,system. Penetrations not have less than a 1-hour fire-resistive rating. The shall be protected by an approved penetration firestop sys- wall shall be rated for exposure from both sides. tern installed as tested in.accordance with ASTM E 814, R321.2.3 Parapet construction. Parapets shall have the with a minimum positive pressure differential of 0.01 inch same fire-resistance rating as that required for the supporting of water(3 Pa)and shall have an F rating of not less than the required fire-resistance rating of the wall or floor/ceil- wall or walls. On any side adjacent to a roof surface, the ing assembly penetrated. parapet shall have noncombustible faces for the uppermost 18 inches(457 mm),to include counterflashing and coping R321.3.2 Membrane penetrations. Membrane penetra- materials.Where the roof slopes toward a parapet at slopes tions shall comply with Section R321.3.1.Where walls are greater than two units vertical in 12 units horizontal required to have a minimum 1-hour fire-resistance rating, (16.7-percent slope), the parapet shall extend to the recessed light fixtures shall be so installed such that the same height as any portion of the roof within a distance of required fire resistance will not be reduced. 3 feet(914 mm),but in no case shall the height be less than 30 inches(762 mm). Exceptions: • 1. Steel electrical boxes that do not exceed 16 square R321.2.4 Structural independence.Each individual town- inches(0.0103 m2)in area provided the total area of house shall be structurally independent. such openings does not exceed 100 square inches (0.0645 m2)for any 100 square feet(9.29 m2)of wall Exceptions: area.Outlet boxes on opposite sides of the wall shall 1. Foundations supporting exterior walls or common be separated as follows: walls. 1.1. By a horizontal distance of not less than 2. Structural roof and wall sheathing from each unit 24 inches,or may fasten to the common wall framing. 1.2. By a horizontal distance of not less than the 3. Nonstructural wall coverings. depth of the wall cavity when the wall cavity is 4. Flashing at termination of roof covering over filled with cellulose loose-fill or mineral fiber common wall. insulation,or 5. Townhouses separated by a common 2-hour fire- 1.3. By molded fire blocking in accordance with resistance-rated wall as provided in Section R321.2. Section R602.8, or R321.3 Rated penetrations.Penetrations of wall or floor/ceil- ing assemblies required to be fire-resistance-rated in 2. Two-hour fire-resistance-rated nonmetallic electri- accordance with Section R321.1 or R321.2 shall be protected in cal outlet boxes shall be installed in accordance with accordance with this section. their listings. 3. The annular space created by the penetration of a fire R321.3.1 Through penetrations.Through penetrations of sprinkler provided it is covered by a metal escutch- fire-resistance-rated wall or floor assemblies shall comply eon plate. with Section R321.3.1.1 or R321.3.1.2. Exception:Where the penetrating items are steel,ferrous SECTION R322 or copper pipes or steel conduits,the annular space shall MOISTURE VAPOR RETARDERS be permitted to be protected as follows: R322.1 Moisture control.In all framed walls,floors and roof/ 1. In concrete or masonry wall or floor assemblies ceilings comprising elements of the building thermal envelope, where the penetrating item is a maximum 6 inches a vapor retarder shall be installed on the warm-in-winter side of (152 mm) nominal diameter and the opening is a the insulation. maximum 144 square inches (92 900 mm2), con- crete, grout or mortar shall be permitted where Exceptions: installed to the full thickness of the wall or floor 1. In construction where moisture or freezing will not assembly or the thickness required to maintain the damage the materials. fire-resistance rating. 2. Where the framed cavity or space is ventilated to allow 2. The material used to fill the annular space shall pre- moisture to escape. vent the passage of flame and hot gases sufficient to 3. In counties identified with footnote a in Table N1101.2. ignite cotton waste where subjected to ASTM E 119 time temperature fire conditions under a minimum positive pressure differential of 0.01 inch of water SECTION R323 (3 Pa)at the location of the penetration for the time PROTECTION AGAINST DECAY period equivalent to the fire-resistance rating of the construction penetrated. R323.1 Location required.In areas subject to decay damage as established by Figure R301.2(7), the following locations R321.3.1.1 Fire-resistance-rated assembly. Penetra- shall require the use of an approved species and grade of lum- tions shall be installed as tested in the approved fire- ber,pressure preservatively treated in accordance with AWPA resistance-rated assembly. Cl,C2,C3,C4,C9,C15,C18,C22,C23,C24,C28,P1,P2 and 52 2000 INTERNATIONAL RESIDENTIAL CODE'" t BUILDING PLANNING R323.1.1 -R324.3 • P3,or decay-resistant heartwood of redwood,black locust,or R323.1.4 Wood columns.Wood columns shall be approved cedars. wood of natural decay resistance or approved pressure pre- 1. Wood joists or the bottom of a wood structural floor when servatively treated wood. closer than 18 inches (457 mm) or wood girders when Exception:Posts or columns supported by piers or metal closer than 12 inches (305 mm) to exposed ground in pedestals projecting 1 inch(25.4 mm)above the floor or crawl spaces or unexcavated area located within the finish grade and are separated therefrom by an approved periphery of the building foundation. impervious moisture barrier. 2. All sills or plates that rest on concrete or masonry exterior R323.2 Quality mark. Lumber and plywood required to be walls and are less than 8 inches(203 mm)from exposed pressure preservatively treated in accordance with Section ground. R323.1 shall bear the quality mark of an approved inspection 3. Sills and sleepers on a concrete or masonry slab that is in agency that maintains continuing supervision, testing and direct contact with the ground unless separated from such inspection over the quality of the product and that has been slab by an impervious moisture barrier. approved by an accreditation body that complies with the 4. The ends of wood girders entering exterior masonry or requirements of the American Lumber Standard Committee concrete walls having clearances of less than 0.5 inch treated wood program, (12.7 mm)on tops,sides and ends. R323.2.1 Required information. The required quality 5. Wood siding,sheathing and wall framing on the exterior mark on each piece of pressure preservatively treated lumber of a building having a clearance of less than 6 inches or plywood shall contain the following information: (152 mm)from the ground. 1. Identification of the treating plant. 6. Wood structural members supporting moisture- 2. Type of preservative. permeable floors or roofs that are exposed to the weather, 3. The minimum preservative retention. such as concrete or masonry slabs,unless separated from 4. End use for which the product was treated. such floors or roofs by animpervious moisture barrier. 5. Standard to which the product was treated. 7. Wood furring strips or other wood framing members 6. Identity of the approved inspection agency. attached directly to the interior of exterior masonry walls 7. The designation "Dry,"if applicable. or concrete walls below grade except where an approved vapor retarder is applied between the wall and the furring Exception: Quality marks on lumber less than 1 inch strips or framing members. (25.4 mm)nominal thickness,or lumber less than nominal 1 inch by 5 inches(25.4 mm by 127 mm)or 2 inches by R323.1.1 Ground contact. All wood in contact with the 4 inches (51 mm by 102 mm) or lumber 36 inches ground and that supports permanent structures intended for (914 mm)or less in length shall be applied by stamping the human occupancy shall be approved pressure preservatively faces of exterior pieces or by end labeling not less than 25 treated wood suitable for ground contact use, except un- percent of the pieces of a bundled unit. treated wood may be used where entirely below groundwater level or continuously submerged in fresh water. R323.3 Fasteners. Fasteners for pressure preservative and fire-retardant-treated wood shall be of hot-dipped galvanized R323.1.2 Geographical areas.In geographical areas where steel,stainless steel,silicon bronze or copper. experience has demonstrated a specific need,approved natu- Exception: One-half-inch (12.7 mm) diameter or greater rally durable or pressure preservatively treated wood shall be steel bolts. used for those portions of wood members that form the structural supports of buildings,balconies,porches or simi- lar permanent building appurtenances when such members SECTION R324 are exposed to the weather without adequate protection from PROTECTION AGAINST TERMITES a roof,eave,overhang or other covering that would prevent moisture or water accumulation on the surface or at joints R324.1 Subterranean termite control.In areas favorable to between members. Depending on local experience, such termite damage as established by Table R301.2(1),methods of members may include: protection shall be by chemical soil treatment,pressure preser- 1. Horizontal members such as girders, joists and vatively treated wood in accordance with the AWPA standards decking. listed in Section R323.1, naturally termite-resistant wood or physical barriers (such as metal or plastic termite shields),or 2. Vertical members such as posts,poles and columns. any combination of these methods. 3. Both horizontal and vertical members. R324.2 Chemical soil treatment. The concentration, rate of R323.1.3 Posts,poles and columns. Posts,poles and col- application and treatment method of the termiticide shall be consistent with and never less than the termiticide label. umns supporting permanent structures that are embedded in concrete in direct contact with the ground or embedded in R324.3 Pressure preservatively treated and naturally concrete exposed to the weather shall be approved pressure resistant wood.Heartwood of redwood and eastern red cedar preservatively treated wood suitable for ground contact use. shall be considered termite resistant. Pressure preservatively 2000 INTERNATIONAL RESIDENTIAL CODE"" 53 For Discussion: • • Rot & Corrosion resistant materials should be considered for the following applications on all new construction and on major remodeling: Exterior Door Jambs Brick Moldings Door Sills Window Sills Facias Frieze Soffits & Ceilings (except where decorative components are not available in rot resistant materials) Siding (except to match existing) Trim Boards All Exterior Deck/Balcony/Porch Components (structural & decorative) Sheathing within 4ft of grade or a deck/balcony/porch Floor Decking on any exterior deck/balcony/porch Floor Decking in interior "wet" areas (bathrooms, utility rooms, kitchens, etc.) Exterior Stairs Exterior Handrails Structural Fence Components Bottom 11" of wood fences Masonry Lintels Other areas for possible application: Exterior Doors Exterior Windows Possible Suitable Materials: Pressure Treated Pine Mahogany Cypress Aluminum Galvanized Steel Stainless Steel Copper Resin Based Composites Fiberglass UV resistant Plastic Nardi (or equal) products Any other material with equal or better rot/corrosion resistance LAll.ottjpt