The parapet wall is capped with a prefinished metal coping installed over two layers of three-quarter-inch treated plywood blocking. The roof membrane extends across the top of the parapet wall and is sealed to the weather-resistant barrier. A half-inch sealant joint with backer rod is applied to both sides of the coping. The substrate for the coping assembly is engineered to withstand uplift pressures in accordance with ANSI-SPRI ES-1 standards. The roof membrane is installed over exterior sheathing, and the weather-resistant air barrier extends under the membrane flashing.
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