This blog post outlines the critical steps and considerations for installing brick flashing correctly to ensure effective water drainage and prevent leaks in buildings. It covers the installation process, types of flashing, sealing techniques, and best practices for maintaining the integrity of the structure.
Flashing is a crucial component in brick construction that ensures water is effectively drained away from walls, preventing leaks and structural damage. This guide provides an overview of the best practices for installing brick flashing, emphasizing the importance of proper techniques and materials.
Flashing is installed to direct water away from the building structure. It is essential to ensure that flashing is installed correctly to avoid water infiltration, which can lead to significant damage over time.
Before beginning the installation of flashing, it is important to assess the building's exterior. If Tyvek or another air barrier is present, the flashing should be installed behind it. If there is no Tyvek, ensure that the flashing is secured directly to the wall using a termination bar.
If the construction drawings specify a drip edge, it should be installed on the brick before the flashing. If there is no drip edge, the flashing must extend to the edge of the brick. This step is crucial for directing water away from the wall.
Once the drip edge is in place, install the flashing. For walls with Tyvek, run the flashing up behind the Tyvek. In cases where there is no Tyvek, secure the flashing to the wall with a termination bar. After securing the flashing, apply caulk along the top edge to provide an additional layer of protection against water infiltration.
Through-the-wall flashing is installed during the laying of block walls. It is placed in the mortar joint and requires careful handling to avoid damage. If this flashing is compromised, repairs can be challenging. It is essential to seal all laps in the flashing with the appropriate materials as recommended by the manufacturer.
Masons often use MP1 to seal joints, including those for end dams. It is vital to seal around any penetrations in the wall, as these areas are common entry points for water. Addressing these penetrations during installation is much easier than repairing leaks after the exterior skin has been completed.
At the end of all installations, ensure that end dams are added to direct water away from doors and windows. Again, sealing all laps and joints in the flashing is critical. The same procedures apply at the lintel as previously mentioned.
When laying brick, it is important to place mortar nets in the air space between the brick and the wall. This prevents dropped mortar from blocking weep holes, which are essential for allowing water to escape from the wall.
Failure to use mortar nets can lead to messy installations, as seen in cases where excess mortar clogs weep holes. This can result in water retention and potential damage to the structure.
Ensure that weeps are installed where flashing is located, as this is where water will attempt to exit the wall. Follow the specifications in the drawings for the type, color, and location of weeps.
To prevent staining of the brick during rain, lay straw at the bottom of the wall. This simple measure can save considerable effort in cleaning the brickwork after installation.
Proper installation of brick flashing is essential for maintaining a dry and structurally sound building. By following these guidelines and best practices, builders can ensure that water is effectively managed, preventing leaks and damage in the long run. With careful attention to detail, the result will be a well-finished building that stands the test of time.
