CSLB C-39 Roofing ContractorFlashing, Ventilation and InsulationEasy
A mason is preparing a masonry chimney to receive counter flashing using a reglet method instead of surface-mounting the flashing on top of the mortar. What is a reglet?
- AA metal cleat used to fasten drip edge to the fascia
- BA groove cut into the mortar joint or masonry to receive and anchor the counter flashing
- CA flexible rubber gasket used to seal pipe penetrations
- DA type of step flashing shingle used at sidewalls
Show answer & explanationAnswer & explanation
Correct answer: B. A groove cut into the mortar joint or masonry to receive and anchor the counter flashing
A reglet is a slot or raked groove cut into masonry (or a mortar joint) into which the top edge of counter flashing is inserted and then sealed, providing a cleaner, more weathertight termination than surface mounting.
Why the other options are wrong
- A. Cleats are fasteners for drip edge/gutters, unrelated to reglets.
- C. Gaskets are used for pipe boots, not masonry counter flashing.
- D. Step flashing is a separate sidewall flashing system, not a masonry groove.
Reglet
A groove or raked-out mortar joint cut into masonry to receive and anchor the top edge of counter flashing.
- Common at chimneys and parapet walls
- Flashing edge is inserted then sealed with mortar or sealant
- Provides a cleaner alternative to surface-mounted counter flashing
Memory trick: Reglet = 'ridge-let' groove that lets flashing sit in tight.