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20. Porches, Dalconies or raised floor surfaces located more than 3Q 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 in, 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 units w~th 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. 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 ' Firestopping shall be provided in the following locations: in concealed spaces of stud walls at the eeillng, floors,soffits, drop ceilings, between stair stringers and at openings around vents, pipes, ducts, chlmneya and fireplaces at telling 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 w~thln the foundation walls shall have all vegeta- tion, top soil and foreign material removed. R-603.2 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 t~es shall be spaced not more than 4 feet on center. 28. 29. 30. less in depth than the cut end of the rafter. At all valley% 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 ~he 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 De deszgned in accordance with approved engineering practice. Tr~sses shall be braced according to their appropriate engineered design. Truss members shall not be cut or altered unless so designed. R-702.9 All plywood, when designed to be exposed ~n outdoor applica-- tions shall be of an exterior type, except that plywood roof sheathi~%g exposed to the underside may be of interior type with exterior glue. R- 703.] Provlde screened attzc 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 A readily accessible attic access framed opening not less than 22 in. by 30 in. shall De p~ovided. R-708 36. Fireplace and chimney con- struction shall conform to chapter 9. INSULATION REQUIREMENTS: Buildings with high-efficiency heating equipment shall be ~nsulated as follow: ceiling R-30 (roof/ceiling assemblies in which has a slope of 3 in 12 or greater, may be R~lg), walls R-il, underfloors R-19, other heating systems, ceiling R-35 /vaulted ceiling 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 subject to mechani- cal damage shall be guarded by a protective barrier. Ridge board shall be at least 1 lnch nominal thickness and not