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......1"''"I.~ *,,_, 1708 ROOF AND CEILING FRAMING 1708.1 Ceiling Joist and Rafter Framing 1708.1.1 Maximum spans for ceiling joists and rafters shall be in accordance with the NFoPA Span Tables for Joist~ and Rafters, or may be designed in accordance with 1701.2 or 1701.3.1. 1708.1.2 Where rafters meet to form a ridge, they shall be placed directly opposite each other and nailed to a ridge board not less than I inch (25 mm) thick, and not less in depth than the cut end of rafters. 1708.1.3 Ceilings joists and rafters shall be nailed to each other where possible and the assembly shall be nailed to the top wall plate in an adequate manner to secure the roof framing to the walls. 1708.1.4 Ceiling joists shall be continuous or securely joined where they meet over interior partitions to provide a continuous tie across the building. 1708.1.5 Where ceiling joists are not parallel to rafters, sub-flooring or metal straps attached to the ends of the rafters shall be installed in a manner to I provide a continuous tie across the building. Where ceiling joists are not i i provided at the top of the rafter support walls, the ridge formed by these '1 rafters shall also be supported by a beam conforming to 1706.2. 1708.1.6 Valley and hip rafters shall be 2 inches deeper than the jack rafters. 1708.1.7 Collar beams of Ix6 boards shall be installed in the upper third of the roof height to every third pair of rafters. 1708.1.8 Notches on the ends of joists shall not exceed one-fourth the depth. Holes bored for pipes or cable shall not be within 2 inches (51 mm) of the top or bottom of the joist and the diameter of any such hole shall not exceed one-third the depth of the joist. Notches for pipes in the top or bottom of joists shall not exceed one-sixth the depth and shall not be located in the middle one-third of the span. i 1708.1.9 Where ends of rafters are not nailed to ridge boards, band J' oists, i i or similar framing members the ends of the rafters shall be supported laterally I by solid blocking or diagonal bracing.