Repair a Shingle Roof Valley Leak in 6 Easy Steps

Repair a Shingle Roof Valley Leak in 6 Easy Steps

Though roof valleys are common leak sites on shingle roofs, it’s typically fairly easy to fix these problems with a little know-how.

Roof valleys are channels designed to drain runoff, and like any other part of your roof, they can degrade over time with exposure to the elements. In other cases, water can become trapped under shingles which have been overlaid to create the valley trough. Both situations can be fixed by removing affected shingles and structural elements and upgrading your roof’s flashing.

Repair a Shingle Roof Valley Leak in 6 Easy Steps

Prepare for the Repair

Follow these three preparatory steps to get ready to fix the valley leak:

  1. Clear any debris in the roof valley and surrounding area.
  2. Take measurements of your roof flashing – most flashing is 14 inches wide, but yours may vary.
  3. Move to the highest end of the valley and work your way down, cleaning shingles from both sides of the valley whether they’re damaged or not. Experts recommend that you give yourself 8 to 10 inches of clearance on each side of the valley. Use a nail bar to loosen the shingles in the affected area.

Repair a Damaged Roof Valley

Here’s how to install new flashing in your roof valleys:

  1. Begin by placing the replacement piece of flashing in the valley, lining up the groove in the center with the middle of the valley. Make sure the flashing’s bottom edge is perfectly aligned with your roof’s lower edge.
  2. Use a metal cutter to alter the length of the flashing to ensure it lines up with your roof’s lower edges. At the top edge of your roof valley, check to make sure the flashing is properly angled to line up with the slope of the roof. Use roofing nails to secure the flashing in place, driving nails at 1-foot intervals on both sides.
  3. Replace all shingles you removed, making sure their edges are at least 1 inch from the elevated center of the flashing piece. Work your way up, starting at the lower edge of the roofing and moving towards the top.

Hire Professional Roofer For Help

Don’t put off repairing a leak, as this can lead to additional structural problems, mold growth and high levels of moisture and humidity, all of which can be difficult and expensive to repair.

If you encounter problems, be sure to consult a reliable roofing professional. They can handle these types of repairs quickly and easily.

Call All Roofing Solutions, your full service roofing contractor with over 15 years of experience in roofing and re-roofing. We will work with you to identify the damage and present you with options tailored specifically to your situation. Our priority is always to provide you with great service!

Call us at 302-725-7663 in Delaware or 610-551-7663 in Pennsylvania to schedule your FREE estimate. And don’t forget to ask about our discount of 15% off any roofing repair project!




  1. Posted August 7, 2015 at 7:52 am | Permalink

    What a great check list for homeowners – great job sharing your knowledge!

  2. Posted August 10, 2015 at 2:25 pm | Permalink

    I am so glad that I have found your advices. Next week I am planing to start repairing my roof. It looks like a lot of work. Actually I think the most tough part will be to clear debris. There are so much leaves that I am not sure if several hours will be enough. Thank you for sharing this tips. Best regards!

  3. Posted August 15, 2015 at 1:40 pm | Permalink

    I don’t get on my roof a lot, so I had no idea my shingles were leaking until I went into the attic after it had rained. They’re only leaking along a trough by the dormer, so it shouldn’t be too hard to repair. I don’t have a lot of time, though, so I might call a professional to save myself the effort.

  4. Posted August 18, 2015 at 3:49 pm | Permalink

    Wow, this makes roof repair sound so easy! A huge storm just passed through my area, and it did some damage to the roof. It’s not terrible, but I want to fix it before it gets too terribly bad. It’s good to know that I will want to clear off a pretty large area, so ensure that all the damage is repaired.

  5. Posted September 11, 2015 at 5:33 am | Permalink

    I couldn’t agree more that is important not to put off doing these kinds of roof repair, as the article says. Small, seemingly insignificant roof problems can quickly turn into very serious, and expensive, problems. It’s important to remember that the roof isn’t the only thing at risk, since it protects everything beneath it.

  6. Posted January 15, 2016 at 8:54 pm | Permalink

    Thanks for mentioning all of the additional problems that can be caused by not fixing a leak when you have the chance. I’ve had a leak for a while now but I haven’t thought much of it. I’d checked around the roof myself and nothing really stuck out to me, but it sounds like I should probably have a pro come look at it for me.

  7. Posted January 20, 2016 at 7:46 pm | Permalink

    Repairing a roof via do-it-yourself techniques can only yield so much good. My wife made fun of me for even trying, but I got at least some progress done. In the end, I am going to follow your advice and call a professional for help, as it’s just too much on my own.

  8. Posted February 12, 2016 at 7:05 pm | Permalink

    Thanks for the tips! I know a little bit about repairing leaks in a shingle roof from helping my dad try to fix leaks when I was a kid. He had some good pointers, but it seems like I should learn a few tips and tricks from another source. Your tips about installing new flashing to my roof will be very helpful. I’ve always had trouble with installing new flashing, especially when it comes to knowing how to properly line them up. I didn’t know that I had to align the flashing with my roof’s lower edge. Now I can be sure that my flashing will be properly aligned.

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