Roofing Valleys, And How To Avoid Leaks

Roofing valleys are the areas where two sloping roof planes meet. They are a critical part of any roofing system and play a vital role in preventing water from seeping into your home. Unfortunately, valleys are also a common source of leaks if they are not installed correctly. In this blog, we will discuss roofing valleys and how to avoid leaks.

Types of Valleys

There are two types of roofing valleys: open and closed. An open valley is when the shingles on one side of the valley are cut back, exposing the underlayment. A closed valley is when shingles from both sides of the valley overlap each other, covering the valley completely.

Open valleys are commonly used in areas with heavy rainfall or snowfall. The exposed underlayment helps to prevent water from backing up and leaking into your home. Closed valleys, on the other hand, are commonly used in areas with moderate rainfall or where aesthetics are a concern.

Valley Installation

Valley installation is a crucial step in preventing leaks. Here are some tips to ensure proper valley installation:

  1. Use Ice and Water Shield

Ice and water shield is a self-adhesive membrane that is installed underneath the shingles in the valley area. It provides an extra layer of protection against water infiltration.

  1. Use Proper Materials

Use roofing materials that are appropriate for the type of valley being installed. For example, closed valleys require a valley flashing, while open valleys require a woven valley.

  1. Pay Attention to Detail

Pay attention to the details during valley installation. Make sure that the flashing is installed correctly and that there are no gaps or spaces where water can seep in.

  1. Use Adequate Roof Pitch

The pitch of the roof can affect how water flows through the valley. A higher pitch can help to prevent water from pooling in the valley and potentially causing a leak.

  1. Hire a Professional Contractor

Valley installation is a job best left to the professionals. Hiring a licensed and experienced contractor can help to ensure that your valleys are installed correctly and without any issues.


Roofing valleys are an essential part of any roofing system, and it’s crucial to ensure that they are installed correctly to avoid leaks. Whether you choose an open or closed valley, make sure to use ice and water shield, appropriate materials, pay attention to detail, use adequate roof pitch, and hire a professional contractor. By following these tips, you can help to ensure that your roofing valleys are installed correctly and will provide reliable protection against leaks.

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