11-19-2007 Planning Commission Packet

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� - � � pCH��1 t N � BUILDING PLANNING f 1 t i ! i SECTIO R302 installed or a whole-house mechanical ventilation �.. EXTERIOR WALL LOCATION system is installed capable of supplying outdoor ven- R302.1 Exterior walls. Construction, projections, openings tiladon air of 15 cubic feet per minute(cfm)(78 L/s) and penetrations of exterior walls of dwellings and accessory per occupant computed on the basis of two occupants buildings shall comply with Table R302.1. These provisions for the first bedroom and one occupant for each addi- shall not apply to walls,projec6ons,openings or penetrations tional bedroom. in walls that are perpendicular to the line used to deternune the 2. The glazed azeas need not be installed in rooms wh�re fire separation distance. Projections beyorid the exterior wall Exception 1 above is satisfied and artificial light is pro- shall not extend more than 12 inches(305 mm)into the azeas vided capable of producing an average illuminatio�of where openings are prohibited. 6 footcandles (65 lux) over the area of the room t a Exceptions: height of 30 inches(762 mm)above the floor leve�. 1. Detached tool sheds and storage sheds, playhouses 3. Use of sunroom additions and patio covers,as defineG�in and similar structures exempted from permits are not Sec�ion R202,shall be pernutted for natural ventilation required to provide wall protection based on location if in excess of 40 percent of the exterior sunroom walls on the lot.Projections beyond the exterior wall shall are open,or are enclosed only by insect screening. ! not extend over the lot line. R303.2 Adjoining rooms. For the purpose of deternumng 2. Detached garages accessory to a dwelling located light and ventilation requirements, any room shall be cons�d- within 2 feet(610 mm)of a lot line are pernutted to ered as a portion of an adjoining room when at least one-half of have roof eave projections not exceeding 4 inches �e area of the common wall is open and unobsiructed and pro- (102 mm). � vides an,opening of not less than one-tenth of the floor area of 3. Foundation vents installed in compliance with this the interior room but not less than 25 square feet(2.3 mz). code aze pernutted. Exception: Openings required for light and/or ventilation shall be pemutted to open into a thermally isolated sunroom . .► addition or patio cover,provided that there is an openable SECTION R303 area between the adjoining room and the sunroom addition LIGHT,VENTILATION AND HEATING or patio cover of not less than one-tenth of the floor area of R303.1 Habitable rooms.All habitable rooms shall have an �e interior room but not less than 20 square feet(2 m2).The aggregate glazing area of not less than 8 percent of the floor ��mum openable area to the outdoors shall be based upon area of such rooms. Natural ventilation shall be through win- �e total floor area being ventilated. dows,doors,louvers or other approved openings to the outdoor R303.3 Bathrooms. Bathrooms, water closet compartments air.Such openings shall be provided with ready access or shall and other similar rooms shall be provided with aggregate glaz- otherwise be readily controllable by the building occupants. ing area in windows of not less than 3 square feet (0.3 m2), � The minimum openable azea to the outdoors shall be 4 percent one-half of which must be openable. of the floor area being ventilated. Exception:The glazed areas shall not be required where arti- Exceptions: ficial light and a mechanical ventilation system aze provided. 1. The glazed areas need not be openable where the The minimum ventilation rates shall be 50 cubic feet per min- opening is not required by Section R310 and an ute(24 Ls)for internuttent ventilation or 20 cubic feet per approved mechanical ventilation system capable of minute (10 L/s) for continuous ventilation. Ventilation air producing 0.35 air change per hour in the room is from the space shall be exhausted direcdy to the outside. TABLE R302.1 EXTERIOR WALLS MINIMUM MINIMUM FIRE EXTERIOR WALL ELEMENT FIRE-RESISTANCE RATING SEPARATION DISTANCE (Fire-resistance rated) 1 hour with ex sure from both sides 0 feet Walls (Not fire-resistance rated) 0 hours 5 feet (Fire-resistance rated) 1 hour on the underside 2 feet Projections (Not fire-resistance rated) 0 hours 5 feet Not allowed N/A <3 feet Openings 25%Ma�cimum of Wall Area 0 hours 3 feet Uniimited 0 hours 5 feet Com 1 with Section R317.3 <5 feet Penetrations • All None re uired 5 feet N/A=Not Applicable. 2006 INTERNATIONAL RESIDENTIAL CODE� 47