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shall have intermediate rails or ornamental closures that do not allow passage of a <br />sphere 5 inches (127 mm) in diameter. Required guards shall not be constructed with <br />horizontal rails or other ornamental pattern that results in a ladder effect. <br />Except/on: <br />The triangular openings formed by the riser, tread and bottom rail of a guard at the <br />open side of a stainNay are permitted to be of such a size that a sphere 6 inches (152 <br />mm) cannot pass through. <br /> <br />R317.1.1 AlteraUons, repairs and additions (Amended). <br />When one or more sleeping rooms are added or created in existing dwellings, the <br />individual dwelling unit shall be provided with smoke alarms located as required for new <br />dwellings; the smoke alarms shall be interconnected and hard wired. <br />Exceptions: <br />1. Smoke alarms in existing areas shall not be required to be interconnected and <br />hard wired where the alterations or repairs do not result in the removal of interior wall <br />or ceiling finishes exposing the structure,, unless there is an attic, crawl space, or <br />basement available which could provide access for hard wiring and interconnection <br />without the removal of interior finishes. <br />2. Repairs to the exterior surfaces of dwellings are exempt from the requirements <br />of this Section. <br /> <br /> R321.1 Two and three family dwellings (Amended). <br />Dwelling units in two and three family dwellings shall be separated from each other by <br />'wall and/or floor assemblies of not less than 1-hour fire-resistive rating when tested in <br />accordance with ASTN E 119. Fire-resistance-rated floor-ceiling and wall assemblies <br />shall extend to and be tight against the exterior wall, and wall assemblies shall extend <br />· to the underside of the roof sheathing. <br />Except/on: <br />A fire resistance rating of 1/2 hour shall be permitted in buildings equipped throughout <br />with an automatic sprinkler system installed in accordance with NFPA 13. <br /> <br />Section R327 Flood Resistant Construction (Repealed). SecUon R327 is hereby <br />repealed. <br /> <br />TABLE R502.3.1(1) FLOOR JOIST SPANS FOR COMMON LUMBER SPFCTF.~ <br />(Residential sleeping areas, live Icad=30 psf, L/D=360) (Repealed). Table R502.3.1(1) <br />is hereby repealed and in place thereof shall be substituted Table R502.3.1(2) FLOOR <br />]OIST SPANS FOR COMMON LUMBER SPECIES (Residential living areas, live Icad=40 <br />psf, L/D=360) <br /> <br />R506.2.2 Base (Amended). <br />A 4-inch-thick (102 mm) base course consisting of clean graded sand, clean graded <br />gravel, clean graded crushed stone passing a 2-inch (51 mm) sieve shall be placed on <br />the prepared subgrade when the slab is below grade. <br />Except/on: <br />A base course is not required when the concrete slab is installed on well-drained or <br />sand-gravel mixture soils classified as Group ! according to the United Soil Classification <br />System in accordance with Table R405.1. <br /> <br />TABLE R802.4(1) CEILING JOIST SPANS FOR COMMON LUMBER SPECIEC; <br />(Uninhabitable attics without storage, live Icad = 10 psf, L/D= 240) (Amended). Table <br />R802.4.1(1) is hereby repealed and in place thereof shall be substituted TABLE <br />R802.4(2) CEILING .1OIST SPANS FOR COMMON LUMBER SPECIES <br />(Uninhabitable attics with limited storage, live Icad = 10 psf, L/D = 240) <br /> <br />R903,4.1 Overflow drains and scuppers (Amended). <br />Where roof drains are required, overflow drains having the same size as the roof drains <br />shall be installed with the inlet flow line located 2 inches (51 mm) above the Iow point <br />of the roof, or overflow scuppers having three times the size of the roof drains and <br />having a minimum opening height of 4 inches (102 mm) may be installed in the <br /> <br /> <br />