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Porches, balconies or raised . floor surfaces located more '.]than 30 in. above the floor or . ~"grade shall have guardrails not less than 36 in. in hr. '.'. Required guardra~lS shall have ~"~"~"/? intermediate rails or ornamen- tal closures which will not allow passage of an object 6 in. or more in diameter. 214.2 21. Smoke detectors shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms and on each additional story of the dwelling including basements. %n dwelling units with spllt 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. Ail 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 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. Flrestoppin9 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 around vents, pipes, ducts, chimneys and fireplaces at c~iling and floor spaces. 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- , tbp soil and foreign i' removed. R-603.2 Rgfters shall be nailed to ,ceiling joists to form a con- ~inuous tie between exterior ~,"~alls 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. 27. ~idge board shall be at least 1 inch nominal thickness and not 28. 29. 30. less in depth than the cut end of the rafter. At all valleys and hips there shall be a valley or hip rafter not less than 2 in, nominal thickness and not less in depth than the cut end of the rafter. R-702.2 when the roof pitch is less than 3 in 12, members support- ing rafters and ceiling joist, such as ridge beams, hips and valleys, shall be designed as beams. R-702.3 Wood trusses shall be designed in accordance w~th approved engineering practice. Tr~sses shall ~e braced according to their appropriate engineered design. Tross 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 e×ter~or type, except that plywood roof sheathing exposed to the underside may be of interior type with exterior glue. R- 703,1 34. INSULAT%ON REQUIREMENTS: Buildings with high-efficlency 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-ii, underfloors R-19, other heating systems, ceiling R~38 (vaulted ceilin~ R-19) walls R-19 and under floor 35. Elements of appliances which create a glow, spark or flame shall be located a min. of in. above garage floor. 36. Appliances subject to mechani- cal damage shall be guarded by a protective barrier. M~ll14 Fireplace and chimney con- struction shall conform to chapter 9. Provide screened attic vents with a net free area of 1/150 of the attic area (or 1/300 ~f half is along eaves and %he other ~alf ~n th~ upper portion). R-707 A readily accessible attic access framed open~ng not less than 22 in. by 30 in. shall be provided. R-708