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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 in. or more in diameter. R- 21. ~moke detectors shall 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 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 22. In new construction, required smoke detecnors 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 Sheik' 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 aro~nd vents, pipes, ducts, chimneys and fireplaces'at ceiling and floor spaces. 402.7 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 The area within the foundation walls shall have all vegeta- tion, top soil and foreign material removed. R-603~2 Rafters shall be- nailed to 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. less in depth than the cut end of the rafter. At all valleys and hips there shall be 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 28. when the roof pitch is less khan 3 in 12, members support- ing rafters and ceiling joist, such as ridge beams, hips and /valleys, shall be designed as beams. R-7O2.3 .. Wooa trusses shall be designed in accordance with approved engineering practice. Trusses shall be braced according their appropriate engineered design. Truss members shall not be cut or altered unless so designed. R-702.9 ~0~. Ail plywood, when designed be exposed in outdoor applica- tions shall be of an exterior type, except that plywood roof sheathing exposed to the underside may be of interior type with exterior 91ne. 703.1 Provide Screened attic vents with a ~et free area of 1/150 of the attic area [or 1/300 if half is along eaves and the other half in the upper portion) ~ R-707 32.~A~-'r'eadily accessible attic access framed opening not less than 22 in. by 30 in. shall be provided. R-708 33. Fireplace and chimney con- s~ruction shall conform to chapter 9. 34. INSULATION REQUIREMBNTS: Buildings with high-efficiency heating equipment shall be insulated as follow: ceiling R-30 (roof/ceiling assemblies in which has a slope of $ in 12 or greater, may be R-19), walls R-11, underfloor$ R-19, other heating systems, ceiling R-38 (vaulted ceiling R-19) walls [{-19 and under floor R- 19. Elements of appliances which create a glow, spark or flame shall be located a min. of 18 in. above garage floor. Mu 1114 Appliances subject to mechani- cal damage shall be guarded by a protecti, ve barrier. M-1114 · Ridge board shall be at least 1 inch nominal thickness and not'