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1710-1712 UNIFORM BUILDING CODE Projections from walls of Type III,IV or V construction may be of noncombus- tible or combustible materials. Combustible projections located where openings are not permitted or where protection of openings is required shall be of one-hour fire-resistive or heavy timber construction conforming to Section 2106. Projections shall not extend more than 12 inches into the areas where openings are prohibited. For projections extending over public property,see Chapter 45. For combustible ornamentation,see Section 1705(d). Guardrails Sec. 1711.All unenclosed floor and roof openings,open and glazed sides of landings and ramps,balconies or porches which are more than 30 inches above grade or floor below,and roofs used for other than service of the building shall be protected by a guardrail. Guardrails shalt be not less than 42 inches in height. Open guardrail and stair railings shall have intermediate rails or an ornamental pattern such that a sphere 6 inches in diameter cannot pass through.The height of (� stair railings on open sides may be as specified in Section 3306 0) in lieu of providing a guardrail.Ramps shall,in addition,have handrails when required by Section 3307. EXCEPTIONS: 1. Guardrails need not be provided on the loading side of loading docks. - 2.Guardrails for Group R,Division 3 and Group M,Division I Occupancies may be 36 inches in height. j 3.Interior guardrails within individual dwelling units or guest rooms of Group R, Division I Occupancies may be 36 inches in height. 4.The open space between the intermediate rails or ornamental pattern of guard- rails in areas of commercial and industrial-type occupancies which are not accessible to the public may be increased such that a 12-inch-diameter sphere cannot pass through. 5.Guardrails on a balcony immediately in front of the first row of fixed seats and which are not at the end of an aisle may be 26 inches in height. 6.Guardrails need not be provided on the auditorium side of a stage or enclosed platform. Foam Plastic Irtisulation Sec.1712.(a)General.The provisions of this section shall govern the require- ments and uses of foam plastic in buildings and structures.For trim,see Section 1705(e). Except where otherwise noted in this section,all foam plastics used in building construction shall have a flame-spread rating of not more than 75 and shall have a smoke-developed rating of not more than 450 when tested in the maximum thickness intended for use in accordance with U.B.C. Standard No. 42-1. All packages and containers of foam plastic and foam plastic ingredients shall bear the label of an approved agency showing either the flame-spread rating and smoke- developed rating of the product at the thickness tested or the use for which the product has been listed.The interior of the building shall be separated from the foam plastic by an approved thermal barrier having an index of 15 when tested in 82