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20. Porches, OalconieS or raLsed floor surfaces located more than 30 in. above the floor or grade shall have guardrails not less than 36 in. in bt. Required guardralls shall have intermediate rails or tel closures which will not allow passage of an object 6 zn. or more in diameter. 214.2 . SmOke detectors shall · ._~ ~nstal ~ed ootslde o~ each separate sleepzng area in the ~mmed%ate vicinity of the bedrooms and on each additional story of the dwelling including basements. In dwelling units with split levels, a smoke detector need be installed only on the upper level, provided the lo,er level is less than one ~ull story below the upper level, except that if there zs a door between levels then a detecter is required on each level. All detectors shall be connected to a sounding device or other detectors to provide, when activated, an alarm ~11 he audible in all sleeplnq areas. R-215.l smo<e detecuors shall receYve oul!d~ng wiring. SmoHe detec- tors may he ~atter? operated when ~ nsta!led in exist lng oulldlngs. 23. Flrestepplng shall be provided %n the followlng locations: concealed spaces of stud walls at the ceiling, floors,soffits, drop callings, between stair stringers and at openings around vents, p~pes, deo%s, chimneys and f~replaces at ceiling a}%d floor spaces. 402.? 24. Foundatlon cripple walls shall ~e framed of studs wltt% a min. length of 14 In. or shall be framed of solid blocking. 402.9 The area wlthl~ the four, darien walls shall have all vegeta~ tzon, top soil and foreign material removed. R-603.2 26. Rafters shall be nailed to ceiling 3oists to form a con~ tinuous ~ie between exterzor walls where 3o~st are parallel to the rafters. Where not parallel, rafters shall be tied with a rafter tie, located at or near the plate as practzcal. ~after ties shall be spaced not ~ere than 4 feet on center. {~ Ridge board shall be at least 1 znch nominal thickness and not less zn depth t~an the cut end of the ra~ter. At al~ valleys and hips there shall be valley or hip rafter not less tha~ 2 in, nominal thickness and not less in depth than the cut end of the rafter. R-702.2 28. When the roof p~tch zs thank 3 in 12, members support- zng raft. ers and cezllng such as rzdge beams, hips and vallcy's, shall Dc deszgned beams. R-702.3 .......... 29. Wood trusses shall be designed in accordance wlth approved engineering practice. Trusses shall be braced according to their appropriate engineered deslgn. Truss me(~bers shall not De cut or altered so deslgned.R-702.9 .j All plywood, when designed to be exposed zn outdoor applica- tions shall De of an exterzoz type, except that plywood roof sheat~zag exposed to thc type wlt~] exter ~r gl0~: . w~th a net free ~re~ of !/150 of tho att ~:: a~e~ ~o~ 1/300 hal f ls a [oflq edVeb ,'~ f~d L h,:. [)ortio:~ . R-lO7 access framed opening not les~ than 22 in, by 30 ltl. shall bc presided. 33. F~replace a}~d chimney cos- struction shall conform to chapter 9. INSULATION REQUIREMEN'IS: Build~ngs ~,~t.h h~gh-eff~e~ency heating equipment shall be insulated a~ follow: cell%ng R-30 (roof~ceiling sssembl ies in whlch has a slope of 3 i2 or greater, may be othe~tin9 systems, ce~l~n~ ~%-.~ ~vaulted ceiling R-19) wails R-19 and under floor 5. Elements of appliances which create a glow, spark or flame shall be located a m=n. of 18 in. above garage floor. M- Appliances sub]ect to mechani- cal damage snell be guarded by a protective barrier. M-1114