A.32 Top of wall detail

Parapet walls are vulnerable, partly because they’re exposed on as many as 5 sides: the outside face, inside face, top face, and both ends. For this reason, great care must be taken in their detailing.
The air barrier on the cavity face of the backing wall continues over the top and down the inside face of the parapet, ultimately connecting with the roof’s air barrier. A rigid flashing spans across the top of the wall. The masonry coping stones may be supported by shims, and they are anchored through the ends of the stone and into the top face of the structural wall, sealing around any penetrations through the flashing. The coping stones should be sloped at least 15 degrees, and sealant, not mortar applied in the joints.
The masonry flashing at the top of the wall is connected to, yet independent from, the flashing system of the roof. Once the masonry components are in place, the roofers can come in with their deck sheathing, vapor barrier, roof insulation, cover board, roofing membrane, and roof flashing, tying their roof assembly to the masonry at the sheet metal receiver. If and when the roof needs replacing, it can be done so without disturbing the masonry.
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