Laserfiche WebLink
#STATUS COMMENTS <br />4 Re-inspection Required 1503.4 Roof drainage. <br />Design and installation of roof drainage systems shall comply with Minnesota Rules, Chapter 4715, <br />Minnesota Plumbing Code, and the following provisions: <br />1. Where required. <br />All roofs shall drain into a separate storm sewer system or to an approved place of disposal. For one- <br />and two-family dwellings, and where approved, storm water is permitted to discharge onto at areas, <br />such as streets or lawns, provided that the storm water ows away from the building. <br />2. Roof design. <br />Roofs shall be designed for the maximum possible depth of water that will pond thereon as determined <br />by the relative levels of roof deck and overow weirs, scuppers, edges, or serviceable drains in <br />combination with the deected structural elements. In determining the maximum possible depth of <br />water, all primary roof drainage means shall be assumed to be blocked. <br />3. Secondary drainage required. <br />Secondary (emergency) roof drains or scuppers shall be provided where the roof perimeter <br />construction extends above the roof in such a manner that water will be entrapped if the primary drains <br />allow buildup for any reason. <br />4. Separate systems required. <br />Secondary (emergency) roof drain systems shall have piping and point of discharge separate from the <br />primary system. Discharge shall be above grade in a location which would normally be observed by the <br />building occupants or maintenance personnel. <br />5. Sizing of secondary drains. <br />Secondary (emergency) roof drain systems shall be sized in accordance with the Minnesota State <br />Plumbing Code. Scuppers shall be sized to prevent the depth of ponding water from exceeding that for <br />which the roof was designed as determined by this code. Scuppers shall not have an opening <br />dimension of less than 4 inches (102 mm). The ow through the primary system shall not be <br />considered when sizing the secondary roof drainage system. <br />[P] 1503.4.1 Secondary (emergency overow) drains or scuppers. <br />Deleted. <br />Deleted <br />1503.4.2 Scuppers. <br />When scuppers are used for secondary (emergency overow) roof drainage, the quantity, size, location <br />and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding <br />h f hi h h f d i d d i d b S i 1 11 1 S h ll h