What is a roof dead valley?

A roof dead valley is a low-lying section of a roof where two sloping planes meet and create a valley that doesn't have an outlet for water to drain. This can cause water to accumulate, leading to leaks and damage to the roof structure over time. In this blog, we'll explore what a roof dead valley is, why it's a problem, and how to address it.

What Is a Roof Dead Valley?

A roof dead valley is a section of a roof where two sloping planes meet at an angle that doesn't allow water to flow freely. This can happen when two roof planes meet at a perpendicular angle, creating a valley that doesn't have an outlet for water to drain. Dead valleys can also occur when a roof slope changes direction, creating a low point where water can accumulate.

Why Are Roof Dead Valleys a Problem?

Roof dead valleys are a problem because they can cause water to accumulate, leading to leaks and damage to the roof structure over time. When water is allowed to sit in a dead valley, it can seep into the roofing material and cause it to deteriorate. This can lead to water leaks, which can cause damage to the interior of the building and create mold and mildew.

In addition to causing damage to the roof structure, dead valleys can also be a breeding ground for pests like insects and rodents. These pests are attracted to the moisture that accumulates in the valley, and can make their way into the building through cracks and gaps in the roof.

How to Address Roof Dead Valleys

If you have a roof dead valley, it's important to address it as soon as possible to prevent damage to your roof and your building. Here are some steps you can take to address a roof dead valley:

1. Install a diverter: A diverter is a piece of metal flashing that is installed in the valley to divert water away from the low point. This can help prevent water from accumulating and causing damage to the roof structure.

2. Install a drainage system: If a diverter is not sufficient, you may need to install a drainage system to channel water away from the valley. This can be done by installing a gutter or downspout at the edge of the valley to collect and redirect water.

3. Replace the roofing material: If the roofing material in the valley is damaged, it may need to be replaced. This can be a good opportunity to install a new roofing material that is more resistant to water damage.

4. Consult a professional: If you're not comfortable addressing the roof dead valley on your own, it's always best to consult a professional roofing contractor. They can assess the situation and recommend the best course of action to address the problem.

In conclusion, a roof dead valley is a low-lying section of a roof where two sloping planes meet and create a valley that doesn't have an outlet for water to drain. This can cause water to accumulate, leading to leaks and damage to the roof structure over time. If you have a roof dead valley, it's important to address it as soon as possible to prevent damage to your roof and your building. By installing a diverter, drainage system, or new roofing material, you can help prevent water from accumulating and causing damage to your roof.