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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 bt. Required guardrails shall have intermediate rails or ornamen- tal closures which will not allow passage of an object 6 in. or more in diameter. R- 214.2 21 .~---tm o k e detectors shall De 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 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: in 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 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, top 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 in depth than the cut er',J of the rafter. At all valleys and hips there shall De a valley or hip rafte~ not less than 2 in. nominal thickness and not less in depth than thc cut end of the rafter. R-702.2 28. When the roof pitch) is than 3 in 12, members suppor'.- lng rafters and ceiling 3ols% such as ridge beams~ hips valleys, shall be desl~ne~ beams. R-702.3 Wood trusses shall be designed in accordance with approved engineering practice. shall be braced according their appropriate engineered design. Truss members not be cut or altered un!~s~ so designed.R-702.9 All plywood, when designed to be exposed in outdoor applica- tions shall be of a~ exterior type, except that plywood roof sheathing exposed to t~e underside may be of interior type with exterior glue. ~- 703.1 Provide screened attic vcl)t~ with a net free area of of the attic area (or 1/300 i~ half is along eaves and the ut her half in the ~pper portion). R-707 32. A readily accessible atnlc access framed opening not less than 22 in. by 30 in. snail be provided. R-708 33. Fireplace and chimney con- struction shall conform to chapter 9. 34. INSULATION REQUIR~MENTS~ 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 walls R-Ii, underfloors R-19, other heating systems, ceiling R-38 (vaulted ceiling R-19) walls R-19 and under floor 19. 5. Elements of appliances which create a glow, spark or flame shall be located a min. of 18 in. above garage floor. M- 1114 6. Appliances subject to mechani- cal damage shall be guarded D~ a protective barrier. M-1114