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20. Porches, balconies Or raised floor surfaces located more than 30 in. above the floor or 9rede shall have guardrails not less than 36 Required guardrails shall have intermediate rails or ornamen- tal closures which will not allow passage of an object 6 in . or' more i~ diameter · R- 214.2 Smoke detectors shall be ins%ailed outside of each separate sleeping area in the immediate vicinity of the bedroo(~S 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 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 28. 29. less in depth than the cu~ end of the rafter. At all v~lleys and hips there shall be a valley or hip rafter not less than 2 in. nol~\inal thickness and not less in depth than the cut end of the rafter. R-702.2 when the roof pitct% is less than 3 in 12, i~embers SuppOr%, ing rafters and ceiling joist, such as ridge beams, h~ps and valleyS, shall be designed as beams. R~702.3 W©od trusses shall be designed in accordance with approved enQineering practice. Trusses shall be traced according t %heir appropriate engineered design. Truss me~bers shall not be cut or altered unless so designed. R-702.9 22. In new construction, required smoke detectors shall receive their primary power from the building wiring. Smoke detec- tors may be battery operated when installed in existing buildings. R-215.2 23. Firestopping shall be provided in the following locations: concealed spaces of stud walls at the ceiling, floors,soffits, drop ceilings, between stair stringers and at openings ~reund vents, pipes, ductS, u h iI~.~n e y s and fireplaces at ceiling and floor spaces. R- 402,7 24 . Foundation cripple walls shall be framed of studs with a min. length of 14 in. or shall be framed of solid blocking. 402.9 25. The area within the foundation walls shall have all vegeta- tion, top soil and foreign material removed. R-603.2 All plywood, when designed to be exposed in outdoor applica- Dions shall be of an exterior type, except that plywood roof sheathing exposed to underside may be of interior type with exterior glue. R- 703.1 Rafters shall be nailed to ceiling joists to form a con- tinuous tie between .exterior walls where joist are parallel to the rafters . Where not parallel, rafters shall be tied with a rafter 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 inch nominal thLckness and not provide screened attic vents with a net free area of 1/150 cf the a~tic 8rea (or 1/300 if half is along eaves and the other half in the upper portion) . R-707 A readily accessible attic access framed opening not less than 22 in. by 30 in. shall be provided. R-708 Fireplace and chimney con- struction shall conform to chapter 9, INSULATION REQUIREMENTS: Buildings with high-efficiency heating equipment shall be insulated as follow: ceiling R-30 (roof/ceiling 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, ceiling R-38 (vaulted ceiling R-19] walls R-19 and under floor Elements of appliances which create a glow, spark or flame shall be located a min. of 18 in. above garage floor. 1114 Appliances subject to mechani- cal damage shall be g~arded by a protective barrier. H-1114