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20. 21. Porches, ha'loonies or raised floor surfaces located more than 30 in. above the floor or grade shall have guardrails not less than 36 in. in ht.'~ 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 Smoke detectors shall be znstalled 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 ~ sounding device or other detectors to provide, when actuated, an alarm which will be audible in all sleeping areas. R-215.l 22. 23. 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 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 shai~l be nailed to ceiling joists tQ: 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 ir~ch nominal thickness and not 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 thzckness and not less in depth than the cut end of the rafter. R-702.2 28.~ 29. 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 deszgned as beams. R-702.3 Wood trusses shall be deslgned in accordance with approved engineering practice. Trusses shall be braced according to their appropriate engineered design. Truss members shall not be cut or altered unless so designed. R-702.9 30. Ail plywood, when designed to b~ exposed in outdoor applica- tions shall be of an exterior type, except that plywood roof . ~. 's-heathing exposed to the underside may be of interior t~p~ ~with exterior glue. R- ::' ~7,03.l , 31~ ~ ~ovide screened attic vents with a net 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. 33. 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. ~NSULATION 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), ~ .,'.:~.'w'alls R-il, u~derfloors R-19, : 1!?-' '...;other heating systems, ceiling R-38 (vaulted ceiling R-19) walls R-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. 1114 Appliances subject to mechani~ cal damage shall be guarded by a protective barrier. M-1114