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c. Individual stair treads shall he designed for the uniformly distributed live load or a 300-pound concentrated load acting over an area()I'4 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 halconies may he designed at 10 psf, See Section R502.2.2 for decks attached to exterior walls_ I.Guard in-lilt components(all those except the handrail),balusters and panel fillers shall he designed to withstand a horizontally applied nomlal load of 511 pounds on an area equal to I square foot.This load need not he assumed to act concurrently with any other lire load requirement. g. For attics with limited storage and constructed with trusses, this live load need he applied only to those portions of the bottom chord where there are hvo or more adjacent trusses with the same web configuration capable OF containing a rectangle 42 inches high or greater by 2 feel wide or greater, located within the plane of the truss. the rectangle shall lit between the top of the bottom chord and the bottom of anw other truss niember,provided that each of the following criteria is met. I the attic area is accessible bT a pull-down stairway or framed in accordance with Section 88117.1. 2 the truss has a bottom chord pitch less than 2'12 Required insulation depth is less than the bottom chord member depth. the bottom chords of trusses meeting the chose criteria for limited storage shall he designed lilt the greater of the actual imposed dead load or 10 psi,u111100nh (kg'hilted raver the cnGre span h (diving used in handrail assemblies and guards shall he designed with a safely factor of 4. the safety factor shall he applied to each of the concentrated loads applied to the lop of the rail, and to the load on the in-fill contponents. l'hese loads shall he 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. 20.10.080 CRC Section R314.3.2 added — Smoke Alarm Installation at Time of Sale or Transfer. Section R314.3 is amended by adding Section R314.3.2 to read as follows: