A reglet is a specific type of flashing termination used primarily on masonry walls (brick, stucco, or concrete). It is a horizontal groove cut into the masonry surface (or a pre-formed receiver) into which the top edge of a counter-flashing is inserted. This joint is then filled with sealant or a lead wedge to create a watertight seal, preventing water from running behind the flashing.
The counter-flashing inserted into the reglet is typically sheet metal (galvanized, aluminum, or copper). The “reglet” itself can be a “surface mount” bar if cutting into the wall isn’t possible.
Because Texas homes frequently feature brick or stone veneers, reglets are essential for waterproofing chimney intersections. “Cut-in” reglets (where the brick is sawed) are preferred over surface-mounted ones, as the sealant on surface mounts often degrades faster in the Texas sun, leading to leaks.