is . 7 -- Drainage System of Adequate Size. A slope less than ¼ inch per foot (0.0208 rad); or. For low-sloped roofs, the exception indicates that reroofing (i.e., re-covering or replacement) is not required to meet the ¼”:12” minimum slope requirement of Section 1507, provided that the roof has positive drainage. water spouts) or emergency outlets. The code proposal to add Exception 2 in the IBC did not include a like change to the IEBC. Automatic Drain Could Save Floating Tank Roofs. Code Calculators automatically generates a detailed list of requirements. Internal Water Dam Series RD-100-W epoxy coated cast iron overflow roof drain with flashing clamp with integral 4 in. The plumbing drainage system must be installed, designed, arranged, constructed, and maintained to protect against fouling, deposit of solids, and stoppages. Learn More . Call for Pricing $ Zurn 4 in. These increases in intensity are attributed to the air being warmer and therefore capable of holding more moisture than cooler air. Build Your Spec in Under 5 Minutes. Where roof drains are required, secondary (emergency overflow) roof drains or, Recovering or replacing an existing roof covering shall not be required to meet the requirement for. FIG. The best opportunity to require the drainage on the roof to be analyzed is when the roof is being re-covered or replaced. Where roof drains are required, secondary (emergency overflow) roof drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason. But be aware that on new construction, this requires an analysis in accordance with Section 1611.2. BRIEF DESCRIPTION OF THE DRAWINGS . The code proposal to add exception #2 was initiated by the National Roofing Contractors Association (NRCA). This must be countered by providing adequate stiffness in order to prevent increasingly larger deflections due to the buildup of rainwater. Another means to minimize the accumulation of rainwater is to camber the roof framing. Exception: Reroofing shall not be required to meet the minimum design slope requirement of one-quarter unit vertical in 12 units horizontal (2 percent slope) in Section 1507 of the International Building Code for roofs that provide positive roof drainage. Leverage the full code compliance platform. Recovering or replacing an existing roof covering shall not be required to meet the requirement for secondary (emergency overflow) drains or scuppers in Section 1503.4 for roofs that provide for positive roof drainage. Section 706.1 begins the same as Section 1511.1. 4134515 to Hill discloses an emergency roof drain for floating roof storage tanks including a siphon carried by the roof with an intake end above the roof and an outlet end below the roof. Overflow drains shall be the same size as the roof drains with the inlet flow line two inches above the low point of the roof and shall be installed independent from the roof drains. The commentary for Section 1511.1 states: What does “consideration” mean? Where roof drains are required, secondary (emergency overflow) roof drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason. For additional information on sizing and other specifications, simply download the submittal sheets located underneath each product. If adequate drainage is not provided, structural damage—and, in the worst cases, roof collapse—can result. Smith carefully designs and manufactures a full line of roof drains, deck drains, scupper drains, promenade and parking area drains and more to satisfy both the artistic eye of the architect and the calculating mind of the engineer. Exception #2 in the IBC section 1511.1 is not included in the IEBC. Highlight differences between any two building codes. ROOF DRAINS ZURN PLUMBING PRODUCTS GROUPSPECIFICATION DRAINAGE OPERATION, 1801 PITTSBURGH AVENUE, ERIE, PA 16502 PHONE 814/455-0921 FAX: 814/454-7929 WEBSITE: www.zurn.com Page 3 PICTORIAL INDEX Z187 6" x 7" or 8" x 12" Oblique Scupper Drain … You must use all of the requirements of the IBC or all of the requirements of the IEBC. • Safety overflow requirements (Emergency/secondary overflow roof drains are recommended. 21500-RDG3 – Roof Drain: Green Roof Type with Internal Polypropylene Dome. Editor’s Note: Code and standards issues of relevance to the building envelope industry are discussed in this ongoing series of articles by RCI’s staff experts. In embodiments, notification of flow in the secondary emergency overflow roof drainage system is by both visual and audible alarms. Joists that run parallel to the drains will not distribute the load as well as joists running perpendicular to the drains. per foot would be acceptable. The commentary for Section 1611.2 states: It is suspected that most reroofs are done without any “consideration” of all loading deflections of the roof deck. OVERFLOW DRAINGE SYSTEM FOR FLOATING ROOF STORAGE TANK, FLOATING ROOF . Call for Pricing $ Thunderbird 3 in. When scuppers are used for secondary (emergency overflow) roof drainage, the quantity, size, location, and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1611.1. The installation and sizing of secondary emergency overflow drains, leaders and conductors shall comply with Sections 1106 and 1108, as applicable, of the International Plumbing Code. Build Your Spec in Under 5 Minutes. On which water is impounded, in whole or in part, and the secondary drainage system is functional but the primary drainage system is blocked. Cast Iron Roof Drain. In roofs lacking sufficient framing stiffness, a condition known as “ponding instability” can occur where increasingly larger deflections caused by the continued accumulation of rainwater are large enough to overload the structure and result in a roof collapse. The secondary roof drains can be of two types — roof drains with an independent piping system or roof drains that combine with the primary roof drainage piping, which will require an increase in piping size. Secondly, the requirement to have a separate system is spelled out. European Patent EP2125576 . Secondary (emergency) roof drains or scuppers are required according to IPC to prevent a rainwater build-up. The drainage system shall incorporate adequate cleanouts placed in a manner that … Emergency drains, are floor drains within a building and serve only the area used for parking of motor vehicles. Additionally, the orientation of structural members can influence the performance of the roof. Smith 1080 Roof Drain is used in flat roofs of any construction where a constant height of water is desired on the roof or an emergency overflow

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