Section 7(d) in Tamil Nadu Cyclone Prone Area Special Building Rules, 1982
(d)Roof. - (i) In the case of pitched roof, the slope of roof shall be between 30 degrees and 40 degrees to the horizontal plane.(ii)The roof frame shall be connected with the masonry wall by extending the fastener strap around the roof joint and the ends duly embedded in the concrete or masonry to a depth of 25 cubic metres or braced diagonally with timber brace nailed to wall studs, joint and rafter as shown in Figures-7 and 8 of Appendix-B.(iii)In the case of pitched roof with tiles, states, asbestos sheets or other light roofing materials, as the case may be, it shall be ensured that the roofing materials, is sufficiently anchored to the roof structure, and the connections shall be checked for the uplift of the roof due to wind or punching as shown in Figure-9 of Appendix-B.(iv)The regions of the roof like eaves, junction and ridges liable for higher uplift force shall be provided with reinforcing bond as shown in Figure-10 of Appendix-B.(v)Slots shall be provided at the ridge of large assembly, industrial and godown buildings with pitched roof ventilation as shown in Figure-11 of Appendix-B.
