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IB Canted Curb

To install a mechanically fastened base flashing on a canted curb, you will need to measure the dimensions of each side of the curb. Measure the curb height and allow for the base flashing to extend a minimum of five inches out onto the roof extending past the membrane termination. Add two inches to each side, measuring out from the base of the cant corner to wrap the corner sufficiently. Precut pieces for all sides. This will provide a sufficient distance to form a one-and-a-half-inch welded seam past the fastener plate.

Be sure to terminate the membrane at the curb transition. Locate the fasteners around the base of the curb spaced 12 inches in the center. Identify the direction of your roof slope. Start your installation on the opposite side of the slope direction, so the laps do not go against the flow of water. This will be referred to as side one.

Begin the first side of the curb with IB PVC flashing membrane. Using a single piece, secure the flashing membrane to the top of the curb. Tack weld the flashing membrane to the roof as close as possible to the base of the cant to hold it in position. Make relief cuts to the flashing membrane at the top and bottom of the cant. Trim the flashing membrane from the base seam to the corner of the cant at a 45-degree angle and round the corners.

Secure the sides of the flashing membrane to the curb and can't. Weld the base seam to form a one-and-a-half-inch welded seam past the fastener plate. Repeat this installation process on the two adjacent sides of the previously installed flashing membrane. These will be referred to as sides two and three. After completing the base seem weld of the flashing membrane for sides two and three, weld the overlap flaps to side one starting from the base and working up to the top of the curb.

Secure the overlap flaps of sides two and three to the curb and cant of side four. Install the final piece on side four by securing the flashing membrane to the top of the curb, welding the base scene, and welding down the overlap flaps using the same procedure as the previous sides. Complete this detail by installing molded universal corners into place. Upon completing the installation, ensure all seams and laps are inspected and probed. If deficiencies are found, the area must be rewelded or repaired.


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