In the construction industry, “L flashing” refers to a type of flashing used to prevent water penetration at the intersection of a vertical surface, such as a wall, and a horizontal surface, such as a roof or deck. L flashing is typically made of durable materials such as aluminum, galvanized steel, or copper and is installed at the base of walls, under the siding, to direct water away from the building and prevent it from seeping into the wall assembly. L flashing plays a crucial role in protecting the building envelope from water damage, including rot, mold, and decay.
Function
The primary function of L flashing is to provide a watertight seal at the intersection of a vertical and horizontal surface, preventing water from entering the building envelope. L flashing is installed under the siding at the base of the wall, with one leg of the flashing extending out over the horizontal surface, such as a roof or deck, and the other leg tucked up behind the siding. This configuration directs water away from the building, ensuring that it does not infiltrate the wall assembly and cause damage.
Installation
L flashing is typically installed during the construction of the building or as part of a renovation or repair project. The installation process involves the following steps:
- Prepare the Surface: Ensure that the surface where the L flashing will be installed is clean, dry, and free of debris.
- Measure and Cut the Flashing: Measure the length needed for the L flashing, and cut it to size using tin snips or a hacksaw.
- Install the Flashing: Slide the L flashing under the siding at the base of the wall, with one leg extending out over the horizontal surface and the other leg tucked up behind the siding. Secure the flashing in place with nails or screws, making sure to seal the fastener penetrations with caulk or sealant.
- Seal the Joints: Seal the joints between the flashing and the siding and between the flashing and the horizontal surface with caulk or sealant to ensure a watertight seal.
Benefits of L Flashing
There are several benefits to using L flashing in construction:
- Water Protection: L flashing prevents water from infiltrating the building envelope at the intersection of a vertical and horizontal surface, protecting the structure from water damage, including rot, mold, and decay.
- Durability: L flashing is typically made of durable materials such as aluminum, galvanized steel, or copper, ensuring long-term performance and protection.
- Easy Installation: L flashing is relatively easy to install and can be incorporated into the construction of a new building or added during a renovation or repair project.
- Cost-Effective: L flashing is a cost-effective solution for preventing water infiltration and protecting the building envelope, potentially saving significant costs associated with water damage repair.
Conclusion
L flashing is a crucial component of the building envelope, providing a watertight seal at the intersection of a vertical and horizontal surface. By preventing water infiltration, L flashing protects the structure from water damage, including rot, mold, and decay. Proper installation of L flashing is essential for ensuring its effectiveness and long-term performance in construction projects.