Building Code Board of Appeals Agenda and Packet 2017 03 16

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181115 trig ioN Sections info -3305 shall have walls eiid Bonita- of one-hour fire -resistive con- Stairs etruct1ari. Where there is enclosed usable apace under stair- (Clont'd.) ways of wood or unprotected metal, the Softs of the stairs shall be protected as required for one-hour fire -resistive construction. (J) Stairway C onshr tioit—ExterIer. Exterior d&ire shall be of incamhuatible material except that on buildings not exceeding two stories in height they may be or wood not less than two inches (2") in nominal thlckneee, (k) Stairway to Roof. In every building more than two atorlea in height, one stairway shall extend to the roof Sur- face unless the roof hus e. slop greater than four in delve. (1) fesalroom. Every required stairway ,Shah have head- room clearance of not less than six feet bix inches [6'8"l measured vertically from the nearest nosing to the nearest soffit. See. 9.°108, (a) General. A ramp conforming to the require- Ramps menta of this Section may be used as an exit. (b) Width. The width of ramps shall be an required for corridors. (c) Slope. The elope of e. ramp shall nut exceed one in eight. (d) Handrails. A ramp with elope exceeding one in ten shall have handrails as required for stairways. (e7 Construction. Ramps shall be constructed as required for stairways. (1) Surface. The surface of ramps shall be roughened or Shall be of non -slip material. See, 8307. {a) Reinoltion. A "horizontal exit" ie e. horn- Horizontal zontal passageway or ramp into another building or into Exits another eectian of the same building through a "One -Hour Fire -Resistive Occupancy Separation." (b) Used as n Required Exit. If conforming to the pro- visions of this Chapter. a horizontal exit may be considered as a required exit. (c) Illecharge AreaK9. A horizontal exit shall lead into a fling area raving capacity for an oceliparit load not less than the occupant load nerved by such exit. The capacity shall be determined by allowing three square feet to aq. ft.) of net clear floor area per occupant. The area into which the horizontal exit leads shall be provided with exits e.e required by Section 3302, at least one of which ellen lead directly to a public way. Sec. 9308. (a) General.: Every interior atairway. ramp, or ,Exit escalator shall be enclosed as specified in this Section. Enclosures EXCEPTIONS; 1. In occupancies other than Group D, an enclosure will not be required for v. atslrws.y, ramp, or 22