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20. Porches, balconies or raised floor surfaces located more than 30 in. above th'e floor or grade shall have guardrail$ not less than 36 in. mn hi. Required guardramls shall have ~ntermediate rails or ornamen- iai closures which will not allow passage of an object in. or more in diameter. 214.2 Smoke detectors shall be ~nstalled outside of each separate sleeping area mn the ~mmediate v~cinlty 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 lower level is less than one full story below the upper level, except that if there is a door between levels then a detector is requmred on each level. All detectors shall be connected to a sounding device or other detectors to provide, when actuated, an alarm which will be audible mn all sleepmng areas. R-215.1 22. In new construction, required smoke detectors shall receive their primary power from the building wiring. Smoke detec- tors may be battery opDrated when mnstalled in existing b~L~ldlngs. R-215.2 F~res~opping shall be provided in the following locations: in concealed spaces of stud walls at thc cemling, floors,soffits, drop ceilings, between stair stringers and at openings around vents, pipes, ducts, chimneys and fmreplaces at ceiling and floor spaces. 402.7 24. Foundation cripple walls shall be fra~ned of studs with a min. length of 14 in. or shall be framed of solmd blocking. 402.9 25. The area w~thin the foundation walls shall have all vegeta- tion, top soil and foreign mater~al removed. R-603.2 26. Rafters shall be nailed to cemling 3oists to form a con- tlnuous tie between extermor walls ,where joist are parallel 50 the rafters . where not parallel, rafters shall be t~ed wmth a rafter tie, located at or near the plate as practical. Rafter ties shall be spaced not more than 4 feet on center. 27. Rzdgc board shall be at least 1 inch ~omlnal thickness and not 33. 34. less mn depth than the c~t end of the rafter. At all valleys and hips there shall be a valley or hip rafter not less than 2 ~n. nominal thickness and not less mn depth than thc cut end of the rafter. ?-702.2 When the roof pmtch is less than 3 In 12, members support- ing rafters and celli~g ~ozst, such as ridge beams, h~ps eno valleys, shall be designed as beams. R-702.3 wood trusaes shall be desiq~ed · n accordance with approved engineering practice. Trusses shall be braced according to their approprlate engineered design. Truss members not be cut or altered unless so designed. R-702.9 All plywood, when desi. gned be exposed in outdoor applica- tions shall be of an exterior type, except that plywood roof sheathing exposed to underside may be of interior type with exterior glue. 703.1 Provide screened attic vents with a ne% free area of 1/150 of the attic area (or 1/300 if half ms along eaves and the other half ie the upper portion). R-707 A readmly accessible attic access framed opening not less than 22 in. by 30 in. s~all me provided. R-708 Fireplace and chmmney con- struction shall conform to chapter 9. INSULATION REQUIREMENTS: Buildings wmth high-efficiency heating equipment shall be insulated as follow: ceiling R-30 [roof/cemling assemblies in which has a slope of 3 in 12 or greater, may be R-19), walls R-Il, underfloors R-19~ other heating systems~ ce~lzng R-38 (vaulted ceiling R-19) walls R-19 and under floor [~ 19. 35. Elements of appliances which create a glow, spark or flame shell be located ammn. of 18 mn. above garage floor. M- 1114 36. Appliances sub]eot to mechaIll- cal damage shall be guarded b? a protective barrier. M-ll]4