How to Effectively Shingle a Roof Valley

Home with three car garage and shingled roof.
The roof valleys in your home need to be protected from the water.

Is there water in those valleys? While a river can be beautiful, when that river is running down your roof, it can be problematic. Make sure that the water that falls on your home successfully moves into your gutters and downspouts rather than sitting in your roof’s valleys. Here’s how to shingle your roof to protect those valleys and ensure that water flows.

What Is a Roof Valley?

A valley is an area on your roof where slopes meet. For instance, if you have a higher-sloped area that slides down to an area with a lower slope, that’s a valley. If you have a dormer window, that creates valleys as well. Unless you have a very simple roof, you likely have some roofing valleys with which to work. These valleys can develop problems over time if water pools in them. Water that pools can seep under your shingles, leading to rot.

Shingling a Roof Valley

If you’re working with a professional to shingle your home, you will likely see one of several possible methods used to shingle your roof valleys.

  • Weaving shingles together uses fewer materials and gives the roof a consistent look in the valley area. According to Fine Homebuilding, “interlocking weave provides double coverage, which makes it the most weather- and wind-resistant choice.”
  • The shingles need to be pushed into the valley. and you can’t nail close to the valley center. There are drawbacks to this method, however. It is slow to complete, and the two sides of the roof need to merge at the same time. There is a danger that if it is not done properly, there can be spaces underneath the shingles. If there is a shingle repair in the future, the weaving can be difficult to redo, and the roofing contractor needs to remove many shingles to get to the ones that need to be replaced.
  • Closed-cut methods place one shingle under the other, and the shingles cross in the valley. It looks like the shingles have been cut in a line down the middle of the roofing valley. This method does not create hollow spaces under the shingles. However, it still means that shingles are the only way that your roofing valley is protected. One benefit of this method is that the two sides don’t need to be shingled at the same time.
Rain on a rooftop.
What happens to your roof during a weather event?

Using Flashing on the Roof Valley

A third method of roofing the valleys of your home involves adding flashing to the roof valleys. After the shingles go onto the roof, the contractor adds flashing in the area where the shingles connect. This metal flashing is very durable. Adding flashing to the valleys prevents water from moving into the roof in the valley area. Some people enjoy the look of flashing and may use colors that complement the roofing color to highlight the topography of the roof. Other people don’t like to have the roofing valleys be so visible.

At Harry Helmet, we’re focused on helping you create a strong, durable home for your family. Whether you need a roof installation or a new gutter, we’re here to help.  Schedule a free estimate today.

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I recently had the Gutter Helmet by Harry Helmet installed on my house. It not only looks amazing, but the guys arrived on time, were professional and efficiently got the job done. I am very satisfied with Gutter Helmet's attention to detail and fulfilling their work as promised. I will definitely tell my neighbors about the Gutter Helmet.
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I have had Gutter Helmets for 20 years. In all that time I've never had a problem until recently a bird's nest found its way into one of my gutters. The installer who came to replace the product was the same installer from 20 years earlier. Now that's impressive. Everyone at Gutter Helmet inclusive of the office staff were professional and a pleasure to work with.
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We needed our roof repaired due to wind damage. After several quotes, Gutter Helmet was the only company that went into our attic to look and see if more damage had occurred. If it wasn't for them taking the extra time to look at everything, we would have had rotting wood under our new roof. They were very professional and gave a fair quote.
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We just had Gutter Helmet installed on our gutters and couldn't be happier. They provided us with useful information about Gutter Helmet and cleaned up everything, leaving no mess behind. We definitely recommend Gutter Helmet to anyone considering this product.
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