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20. Porches, balconies or raised less in depth than the cut end floor surfaces located more of the rafter. At all valleys than 30 in. above the floor or and hips there shall be less ~ s grade shall have guardra, ils not valley or hip rafter not less than 36 in. ~n hr. than 2 in. nominal th~cknes Required guardrails shall have and not less in depUh than the cut end of the rafter. intermed~at rails or tel closures %vhich will not -- allow passage of an object 6 28. When the roo~ pi%ch is less tn or more in diameter. R- than 3 in 12, members support- · lng rafters end ceiling joist, 214,2 ...... such as ridge beams, hips and 21. Smoke detectors shall be valleys, shall be designed,as ~nstalled outside of each .. ...... beams._. ]t-702.3~.. separate sleeping area in the -- ~mmediate vicinity of the 29, Wood trusses shall be designed bedrooms and on each additional in accordance with approved story of the dwelling including eng~neer~ g p~actiee. ~'russes basements. In dwelling units shall be braced according to with split levels, a smoke their appropriate engineered detector need be installed only design. ~russ members shall on the upper level, provided not be cut or altered unless the lower level is less than so des~gned,R 102. one full story below the upper - level, except that if there is A1 1 , when deslgned to a door between levels then a be exposed in outdoor applica- detector is required on each tions shall be of an exterior level. All detectors shall be type, except that plywood roof connected to a sounding device sheathing exposed to the or other detectors to provide, underside may be of interior when actuated, an alarm which type with exterior glue. will be audible in all sleeping 703.1 areas. R-215.1 ........................ .~--. · --.-- Provide screened a~c vents !2· In new construction, required with a net free a~'ea of 1/150 smoke de~ectors shall receive of the attic ar~a (or 1/300 ~hetr primary power from the half is along eaves and the muilding %{iring. Smoke detec- other half in the upper tore may be battery operated portion). [{-707 when installed in existing buildi~%gs. R-215.2 32. A readily accessible a~lc ~ access framed open~ng not less pping shall be provided than 22 ~n, by 30 ~n. shall be n the following locations: in provided. concealed spaces of stud walls at the ceiling, floors,soffi~s~ Fireplace and chilhney con- drop ce~llngs, between stair struction shall conform to ~ ~ringers and a~ openings chapter 9. around vents~ pipes, ducts, chimneys and fireplaces at 34, %NSULATION REQUIREMSNI'S; ceiling and floor spaces. R- Buildings with hggb-e£flclency 402.7 tlea~ing equipment shall be insulated as follow: ceiling Foundation cripple walls s~all R-30 (roof/ceiling assemblies ~a framed of studs with a rain. ~n which has a slope of 3 in lenqzh of 14 in, or shall be 12 or greater, may be }{-19), framed of solid blocking. R- walls R-11, underfloors 402.9 other heating systems, ceiling ~{-35 (vaulted ceiling R-19) T~e area within the foundation walls S-19 and under floor walls shall have all vegeta- tion, top soil and foreign raaterial removed. R-603.~2 35. Elements of appliances which create a glow, spark or flame Rafters shall be. nailed to shall be located a min. of 18 ceiling Joists to form ~a con- in. above garage floor, tinuous tie between exterior 1114 walls where joist are parallel ............ to the rafters, Where not 6~ Appliances subject to mechani- parallel, rafters shall be tied cal damage shall be guarded by with a rafter tie, located at a protective barrier, or near the pla~e as practical. Rafter ties shall be spaced not :'e than 4 feet on center. Ridge board shall be at least 1 inch nominal thickness and not