A single pipe penetrates a roof assembly surrounded by four-by-eight wood framing secured with three-eighths-inch lag bolts with lead washers on vertical sides at six inches on center. Waterproofing flashing integrates with the roofing and cant, finished with caulk around the penetration. A storm collar is fitted above the flashing, and a one-and-a-half-inch by three-inch by one-eighth-inch collar fastens to the duct with three-sixteenths-inch diameter tapping screws at six inches on center. Three-eighths-inch diameter Hilti Kwik Bolt TZ2 anchors with a minimum two-and-a-half-inch embedment anchor the assembly.
4" X 8" WOOD CAULK AROUND WATERTIGHT FLASHING, SEE ARCH. DWGS. ROOFING CANT 1-1/2" X 3" X 1/8" COLLAR. FASTEN TO DUCT WITH 3/16"ø TAPPING SCREW, 6" O.C. FRAME AROUND 7'-0" 3/8"ø HILTI KWIK BOLT TZ2 WITH MIN. 2-1/2" EMBEDMENT (TYP) STORM COLLAR SECURE TO WOOD BLOCKING WITH 3/8" LAG BOLTS WITH LEAD WASHER ON VERTICAL SIDES, 6" O.C.
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