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20. 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 guardrails shall have intermediate rails or ornamen- tal closures which will not allow passage of an object 6 ~n. or more in diameter. R- 214.2 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. In dwelling un,ts with split levels, s 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 In new construction, required smoke detectors shall receive their primary power from the building wlring. Smoke detec- tors may' be battery operated when installed in existing buildings. R-215.2 23. Flrestopping shall be provided in the following locations~ in concealed spaces of stud walls at the Gelling, floors,soffits, drop ceilings, between stair stringers and at openings around vents, pipes, ducts, chimneys 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. R- 402.9 25. The area within the foundation walls shall have all vegeta- tion, Cop soil and foreign material removed. R-603.2 26. 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. 27. Ridge board shall be at least 1 inch nominal thickness and not less 1N depth of the rafter. At all ~aiie.~ and hips there shall be a valley or hip rafter not less than 2 in. nominal thlck7es~ and not less in Cut end of the rafter. 2-702.2 28. When the roof piton is than 3 in 12, members lng rafters and ceiling such as rldge beams, [~ps valleys, shall De designee besms. R-702.3 Wood trusses shall be deslgeed in accordance with approves engineering practice. 7russcs shall be braced according their appropriate eng~neara~ design. Truss memDers ssa! i not be cut or altered so designed.R-702.9 All plywood, when designed to be exposed in outdoor app!lca- t~ons shall be of an exterior type, except that plywood roof sheathing exposed to underside may be of lntcrlor type with exterior gl~:,e. R- 703.1 Provide screened attic vsnt~ with a net free area of 1/!50 of the attic area (or 1/300 if half is along eaves and ct her half ~n the uppe~ portion)· R~707 A readily accessible au%kc access framed opening not less than 22 in. by 30 in. shall ~e provided. R-708 33. Fireplace and chzmnsy con- struction shall conform to chapter 9. 34. INSULATION REQUIREMENTS : Buildings with high-efficiency heating equIpment shall De insulated as follow: ceiling R-30 (roof/ceiling assemblies in which has a slope of 3 12 or greater, may be walls R-11, underfloors R-19, other heating systems, ceillmg R-38 (vaulted ceiling R-19) walls R-19 and under floor 19. Elements of appliances which create a glow, spark or flame shall be located a min, of 18 in. above garage floor. M- 1114 Appliances Gal damage a protective subject to methane- shall be guarded barrier.