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<br />221423.1 – ROOF DRAINS <br /> <br />Project Manual for Whitted Building Roof Replacement <br />Orange County, Hillsborough, NC <br />Prepared by Atlas Engineering, Inc., 551-A Pylon Drive – Raleigh, NC 27606 <br />May 2022 <br /> <br />SECTION 221423 <br /> <br />ROOF DRAINS <br /> <br />PART 1 GENERAL <br /> <br />1.01 WORK INCLUDED <br /> <br />A. Install 8 new 3″ diameter primary drains on Roof Area B with a 4’ drain sump. The new primary <br />drains should be set on the existing wood deck. Core the existing roof deck to allow for installation <br />of a new 3″ I.D. vertical drain line, and transition to a 3″ I.D. horizontal drain line within the existing <br />attic space. The new primary drain lines should be located around the perimeter, 4’ from the parapet <br />wall, and at the same location of the existing parapet wall scupper openings. Core through the <br />existing exterior masonry wall to allow for the horizontal drain line to run from the interior attic <br />space out to a copper conductor head and downspout. The downspout should be located at the same <br />location as existing downspouts and run into existing underground storm drainage where <br />applicable. Locate the conductor head within the flattest section of the existing exterior cornice and <br />remove trim as necessary. Ensure all conductor heads are located at the same elevation around the <br />building. <br /> <br />B. Install 8 new 4″ diameter secondary drains on Roof Area B. Do not sump or shave insulation around <br />overflow drain. The new overflow drains should be set on wood blocking on the existing wood <br />deck. Core the existing roof deck to allow for installation of a new 4″ I.D. vertical drain line, and <br />transition to a 4″ I.D. horizontal drain line within the existing attic space. Core through the existing <br />exterior masonry wall to allow for the horizontal drain line to run from the interior attic space out <br />to a drain nozzle/lamb’s tongue. Locate the lamb’s tongue centered within the flattest section of the <br />existing exterior cornice. Ensure all lamb’s tongues are located at the same elevation, and equal <br />spacing from the new primary drain outlets/downspouts around the building. <br /> <br />C. Test all drains/underground drainage for free flow prior to beginning of work. Clogged or blocked <br />drains/pipes shall be reported to the Owner. <br /> <br />D. Adjust the existing drain heights and add extensions as necessary to provide proper installation of <br />the new roof system on Roof Areas C, E, and F. <br /> <br />E. Install new 4″ diameter overflow scuppers and drain nozzles/lamb’s tongues at the locations shown <br />on the drawings. <br /> <br />1.02 ENVIRONMENTAL CONDITIONS <br /> <br />A. Materials installation shall proceed only when weather conditions are in compliance with the <br />applicable manufacturer's recommendations for installation and no precipitation is imminent. <br />Materials installed during adverse weather conditions shall be subject to rejection including removal <br />and replacement. <br /> <br />1.03 SUBMITTALS <br /> <br />DocuSign Envelope ID: 89558C18-938A-4BFF-B14A-A2214E8AA5DD