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a. Elevated garage floors shall be capable of supporting a 2,000 -pound load applied over a 20- square -inch area. b. Attics without storage are those where the maximum clear height between joist and rafter is less than 42 inches, or where there are not two or more adjacent trusses with the same web configuration capable of containing a rectangle 42 inches high by 2 fleet wide, or greater, located within the plane of the truss. For attics without storage, this live load need not be assumed to act concurrently with any other live load requirements. c. Individual stair treads shall be designed for the uniformly distributed live load or a 300 -pound concentrated load acting over an area of4 square inches, whichever produces the greater stresses. d. A single concentrated load applied in any direction at any point along the top. e. Decks that are not exterior balconies may be designed ai 40 psf. See Section R502.2.2 for decks attached to exterior walls. f. Guard in -till components (all those except the handrail), balusters and panel tillers shall be designed to withstand a horizontally applied normal load of 50 pounds on an area equal to I square foot. This load need not be assumed to act concurrently with any other live load requirement. g. For attics with limited storage and constructed with trusses, this live load need be applied only to those portions of the bottom chord where there are two or more adjacent trusses with the same web configuration capable of containing a rectangle 42 inches high or greater by 2 feet wide or greater, located within the plane of the truss. The rectangle shall fit between the top of the bottom chord and the bottom of any other truss member, provided that each of the following criteria is met. 1. The attic area is accessible by a pull -down stairway or framed in accordance with Section R807. I. 2. The truss has a bottom chord pitch less than 2:12. 3. Required insulation depth is less than the bottom chord member depth. The bottom chords of trusses meeting the above criteria for limited storage shall be designed for the greater of the actual imposed dead load or 10 psf, unilormly distributed over the entire span. h. Glazing used in handrail assemblies and guards shall be designed with a safety factor of 4. Fhe safety factor shall be applied to each of the concentrated loads applied to the top of the rail, and to the load on the in -fill components. These loads shall be determined independent of one another, and loads are assumed not to occur with any other live load. 20.10.060 CRC Section R308.7 added — Shower Enclosures. Section R308 is amended by adding section R308.7 to read as shown in section 2411 of the Pleasanton Building Code (PMC Chapter 20.08). 20.10.070 CRC Section R313 amended— Automatic Fire Sprinkler Systems Section R313 is deleted in its entirety and amended to read as follows: R313.1 Automatic Fire Sprinkler Systems. An automatic residential fire sprinkler system shall be designed and installed in accordance with NFPA 13D in all new one - and two- family dwellings and townhouses. In addition, the fire - sprinkler system shall be designed and sprinklers shall be installed in the following locations: 1. Attic shall be provided with intermediate temperature -rated residential fire sprinklers for detection coverage, and located at a spacing equivalent to 30 feet by 30 feet centers and a maximum distance of 15 feet from outside walls. 2. Fire sprinklers shall be provided in garages. Fire sprinklers shall be intermediate rated, quick response type, with a maximum coverage area of 130 square feet per sprinkler. R313.2 Large One- and Two - Family Dwelling Residential Sprinkler Systems. In addition to the requirements specified in R313.1, one- and two- family dwellings with a habitable floor area greater than 7,500 square feet shall have an automatic fire - sprinkler system designed to include all sprinklers within a compartment, up to a maximum of four sprinklers.