Reglet Counter Flashing: 2-Piece & Metal Options Explained

Flashing is the primary waterproofing layer that directs water away from a joint, such as where a roof meets a wall. Counterflashing is a secondary layer installed above the primary flashing, with its top edge secured into the wall (often in a reglet). It overlaps the base flashing, protecting the primary seal from water infiltration and degradation.

A reglet is a precisely cut or pre-formed channel in a vertical surface like a parapet wall or chimney. Its function is to provide a secure, recessed anchor point for the upper edge of counterflashing. By embedding the flashing into the wall and sealing it, a reglet ensures a much more reliable and long-lasting waterproof barrier than a simple surface-mounted seal.

Installation typically involves cutting a groove into the masonry or concrete wall to a specific depth using a grinder with a diamond blade. The counterflashing is then inserted into this groove, secured in place, and sealed with a high-grade sealant. For an alternative to protect masonry joints, our WEATHERCAP system is embedded directly into sealant-filled joints without cutting the masonry.

Yes, common types include surface-mounted, two-piece, and spring-loaded reglets. While these are ideal for roof-to-wall transitions, for protecting masonry-to-masonry joints, our WEATHERCAP system offers a different approach. It provides flexible, long-term sealant protection with Type A (flat) and Type B (cove) profiles designed for specific joint geometries.

Copper flashing is prized for its exceptional durability, corrosion resistance, and longevity. It serves as a robust barrier against water intrusion in high-end roofing and wall systems. Copper is also chosen for its aesthetic value, as it develops a distinctive blue-green patina over time, making it a premium choice for both new construction and historic restoration projects.

For most architectural applications, 16 oz. (24 gauge) copper is the standard for flashing. In some cases, a heavier 20 oz. (22 gauge) copper may be specified for areas requiring greater rigidity or durability, such as roof valleys or intricate trim details. The appropriate gauge depends on the specific structural and aesthetic requirements of the project.

When installed correctly, copper roof flashing can last for more than 100 years, often outliving the primary roofing material itself. Its longevity is a key benefit. Similarly, for masonry joints that require flexibility, our soft lead WEATHERCAP system offers exceptional durability by moving with the building to protect the underlying sealant for decades.