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e porches~ baloonies or raised floor surfaces located more than 30 in. above the floor or grade shall have guardrails not lees than 36 in. in Required guardrails shall have intermedkate rails or ornamen- tal closures which will not allow passage of an object in. or more ii% diameter, R- 21~,2 Smoke detectors shall be ~%stal led outside of each separate sleeping area In the ~mmediate vicinity of the bedrooms and on each additional story of the dwelling including basements. In dwelling units with split levels, a smoke detector need b~ 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 required 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 in all sleeping areas. R-215.1 22. In new constructlon~ required smoke detectors shall receive their primary power from the building wiring. Smoke detec- tors may be battery operated when installed in existing ~uildings. R-215.2 Firestopping shall be provided in the following locations: in concealed spaces of stud walls at the ceiling, floors,soffits, drop ceilings, between stair stringers and at openings around vents, pipes, ducts~ c n l~nneys and fireplaces at ceiling and floor spaces. 402.7 24. Foundation cripple walls shall De framed of studs with a min. length of 14 in. or shall be framed of solid blocking, R- 402.9 25. The area withln the foundation walls shall have all vegeta- tion, top soil and foreign material removed, R-60~.2 Rafters shall be nailed to ceiling joists to form. a con- t~nuous tie between exterior walls where ~oist are parallel to t~e rafters. Where not parallel, rafters shall be tied w%th a ~after tie, located at or near the plate as practical, Rafter ties shall be spaced not more than 4 feet on center. Ridge board shall be at least 1 ~neh nominal thicknes~ and sot less an depth then tile cut er,d of the rafter. A% all valleys and hips there at, all r)e a valley or h~p rafter not less than 2 in. nominal thickness and not less in depth than cut end of the rafter. R-702.2 28. than 3 ~n 12~ members su?p0rt- lng rafters and celllr~ valleys, shall ~e designed as beams. R~702.3 29. Wood trusses shall oc designed in accordance wish approved engineering practice. Trusses shall De braced according ~o their appropriate engineered design. Truss members shall not be cut or altered unless so designed,R-702,9 All plywood, when designed to be exposed in outdoor applica- tions shall be of an exterior type, except that plywood roof sheathing exposed to the underside may be of ~nter~or type with exterior glue. Provide screened attic vents wi~h a net free area of 1/150 of the attic area (or 1/300 zf half ia along eaves and tne other half is the upper portion). R-707 A readily accessible at'tic access framed opening not less than 22 in, by 30 in. shall be provided. R-708 Fireplace and chlmlley con- structien shall conform to chapter 9. Buildings with heating equipment shall be insulated ae follow: ce~lin9 R-30 (roof/ceiling assemblies in whlch ~as a slope of 3 12 or grea~er, may be walls R-11, underfloors other hea~in9 systems, ceiling R-3~ (vaulted ceiling walls R-19 and under floor 19. 35. Elements of appliances which oreate a glow~ spark or flame shall be located a m~n, ef 18 in. above garage floor, M- 1114 Appliances subleet to mechani- cal damage shall be guarded by a protective barrier. M-1114