Dead Valley drainage and kick out flashing on a concrete tile roof

Dead Valley:
In roofing, a "dead valley" refers to a low-slope area where two roof planes meet, forming a valley between them. These valleys are often designed to channel water runoff away from the roof. However, dead valleys can pose a challenge because they can collect and trap water instead of allowing it to flow freely. As a result, they can become susceptible to leaks and water damage if not properly managed.

Dead valleys are a concern because they receive less direct sunlight and airflow, leading to slower evaporation of water. Additionally, debris such as leaves and branches can accumulate in these areas, exacerbating water pooling.

To address dead valleys and prevent water-related issues, proper roofing techniques and materials should be employed. This can include the use of suitable underlayment, ensuring proper drainage, and proper installation of flashing to redirect water away from these vulnerable areas.

Kickout Flashing:
Kickout flashing is a critical component in preventing water from flowing down the exterior wall surface where a roof plane meets a sidewall. It is typically installed at the lower end of a roof-wall intersection and serves to redirect water away from the wall and into the gutter system.

When water flows down a roof and reaches the wall, it can get trapped along the wall if there is no proper mechanism to direct it into the gutters. Without kickout flashing, water can infiltrate the wall, leading to moisture problems, leaks, and potential structural damage.

Kickout flashing is designed to "kick out" or divert the water away from the wall and into the gutters, preventing it from seeping into the building envelope. The flashing is installed at an angle and extends out over the edge of the sidewall, allowing water to be effectively channeled away.

Proper installation of kickout flashing is essential to ensure its effectiveness in protecting the building from water damage. It should be integrated with the roof flashing, wall cladding, and gutter system to create a continuous and reliable water management system.

Both dead valleys and kickout flashing are important considerations in building construction to manage water runoff effectively and prevent potential water-related issues that could compromise the integrity of the structure.