5610 WEST DR 2017-07-28 - Laserfiche WebLink

BUILDING PLANNING 4. One thickness of 3/4 inch (19.1 mm) particleboard trical outlets, lighting, devices, luminaires, wires, speakers, with joints backed by 3/4 inch (19.1 mm) particle- drainage,piping and similar openings or penetrations shall be board. permitted. 5. One-half-inch (12.7 mm) gypsum board. Exceptions: 6. One-quarter-inch (6.4 mm) cement-based millboard. 1. Floor assemblies located directly over a space pro- 7. Batts or blankets of mineral wool or glass fiber or tected by an automatic sprinkler system in accor- other approved materials installed in such a manner dance with Section P2904, NFPA 13D, or other as to be securely retained in place. approved equivalent sprinkler system. ' 8. Cellulose insulation installed as tested in accordance 2• Floor assemblies located directly over a crawl space with ASTM E 119 or UL 263,for the specific appli- not intended for storage or fuel-fired appliances. cation. 3. Portions of floor assemblies shall be permitted to be R302.11.1.1 Batts or blankets of mineral or glass unprotected where complying with the following: fiber. Batts or blankets of mineral or glass fiber or 3.1. The aggregate area of the unprotected portions other approved nonrigid materials shall be permitted does not exceed 80 square feet(7.4 mZ)per story for compliance with the 10-foot (3048 mm) horizontal fireblocking in walls constructed using parallel rows of 3.2. Fireblocking in accordance with Section studs or staggered studs. R302.11.1 is installed along the perimeter of the unprotected portion to separate the unprotected R302.11.1.2 Unfaced fiberglass. Unfaced fiberglass portion from the remainder of the floor assem- batt insulation used as fireblocking shall fill the entire cross section of the wall cavity to a height of not less bly. than 16 inches (406 mm) measured vertically. Where 4. Wood floor assemblies using dimension lumber or piping,conduit or similar obstructions are encountered, structural composite lumber equal to or greater than the insulation shall be packed tightly around the 2-inch by 10-inch (50.8 mm by 254 mm) nominal obstruction. dimension, or other approved floor assemblies R302.11.1.3 Loose-fill insulation material.Loose-fill demonstrating equivalent fire performance. insulation material shall not be used as a fireblock R302.14 Combustible insulation clearance. Combustible unless specifically tested in the form and manner insulation shall be separated not less than 3 inches (76 mm) intended for use to demonstrate its ability to remain in from recessed luminaires, fan motors and other heat-produc- place and to retard the spread of fire and hot gases. ing devices. R302.11.2 Fireblocking integrity. The integrity of fire- Exception: Where heat-producing devices are listed for blocks shall be maintained. lesser clearances, combustible insulation complying with R302.12 Draftstopping. In combustible construction where the listing requirements shall be separated in accordance there is usable space both above and below the concealed with the conditions stipulated in the listing. space of a floor-ceiling assembly,draftstops shall be installed Recessed luminaires installed in the building thermal so that the area of the concealed space does not exceed 1,000 envelope shall meet the requirements of Section N1102.4.5 of square feet (92.9 m2). Draftstopping shall divide the con- this code. cealed space into approximately equal areas. Where the assembly is enclosed by a floor membrane above and a ceil- ing membrane below, draftstopping shall be provided in SECTION R303 floor-ceiling assemblies under the following circumstances: LIGHT,VENTILATION AND HEATING 1. Ceiling is suspended under the floor framing. R303.1 Habitable rooms. Habitable rooms shall have an 2. Floor framing is constructed of truss-type open-web or aggregate glazing area of not less than 8 percent of the floor perforated members. area of such rooms.Natural ventilation shall be through win- dows,skylights,doors,louvers or other approved openings to R302.12.1 Materials.Draftstopping materials shall be not the outdoor air. Such openings shall be provided with ready less than '/,-inch (12.7 mm) gypsum board, '/,-inch (9.5 access or shall otherwise be readily controllable by the build- mm) wood structural panels or other approved materials ing occupants. The openable area to the outdoors shall be not adequately supported.Draftstopping shall be installed par- less than 4 percent of the floor area being ventilated. allel to the floor framing members unless otherwise Exceptions: approved by the building official. The integrity of the draftstops shall be maintained. 1. The glazed areas need not be openable where the *k R302.13 Fire protection of floors.Floor assemblies that are opening is not required by Section R310 and a not required elsewhere in this code to be fire-resistance rated, whole-house mechanical ventilation system is shall be provided with a '/,-inch (12.7 mm) gypsum wall- installed in accordance with Section M1507. board membrane, '/,-inch (16 mm) wood structural panel 2. The glazed areas need not be installed in rooms Imembrane, or equivalent on the underside of the floor fram- where Exception 1 is satisfied and artificial light is ing member. Penetrations or openings for ducts, vents, elec- provided that is capable of producing an average 2015 INTERNATIONAL RESIDENTIAL CODE 55