Where should counter-flashing be inserted when working with brick structures?

Counter-flashing is designed to direct water away from building elements and prevent leakage in areas where two building surfaces meet, particularly at roof-to-wall transitions. When working with brick structures, counter-flashing should be inserted into the mortar lines. This practice allows for a secure seal that aligns with the brickwork, ensuring that water is effectively diverted and does not penetrate into the mortar joints or the wall assembly itself.

Inserting counter-flashing into the mortar lines helps prevent water from flowing behind the flashing, which could lead to moisture damage and deterioration over time. This placement is crucial in maintaining the integrity of the brickwork and the overall structure. When properly installed in this manner, the counter-flashing can perform its function effectively by providing a physical barrier against water intrusion.

Other choices may suggest placing flashing in locations that would not create an effective means of waterproofing. For example, inserting it into a groove cut into wood would not be ideal for a brick application, as it does not offer the necessary integration with the mortar lines. Similarly, placing counter-flashing under shingles or on top of siding is not appropriate for brick structures, as these do not address the root of potential water intrusion issues in masonry work.