§ 13-52-270. Rain loads.  


Latest version.
  • Roofs having a pitch of less than 30 degrees shall be designed for an environmental rain load or snow load or live load considered to act on the horizontal projection of the roof surface for the appropriate roof drain head system with or without controlled flow as described in Section 13-168-640* of this Code. Roofs having a pitch of 30 degrees or more shall be designed for snow or lateral pressures as required in Sections 13-52-280 and 13-52-290.

    (a)   For roof areas equipped with roof drain heads described in Section 13-168-640* of this Code, the design load shall be 25 pounds per square foot of roof area. Maximum ponding shall not exceed three inches above the surface of the roof immediately adjacent to the roof drain head.

    (b)   For roof areas equipped with roof drains for controlled flow as described in Section 13-168-650* of this Code, the design load shall be 35 pounds per square foot of roof area. Maximum ponding shall be limited so that the overflow shall not exceed six inches above the surface of the roof immediately adjacent to the roof drain head.

    * Editor's note – Coun. J. 3-28-01, p. 55444, § 1, repealed Ch. 13-168 , which pertained to plumbing provisions.

(Prior code § 68-3.5; Added Coun. J. 11-29-89, p. 8387)