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What are the Signs that a Nashville Roof is Failing?

November 17th, 2025 | 6 min. read

What are the Signs that a Nashville Roof is Failing?

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Do you think your Nashville, TN, home needs a new roof? Are you trying to decide if your roof is actually failing before reaching out to a Nashville roofer?

One of the biggest complaints Nashville homeowners have about the roofing industry is dishonesty. They automatically think they’ll be sold a roof, which is what many companies try to do. 

At Bill Ragan Roofing, I don’t believe in operating this way. Our Roofing Advisors do not sell roofs to homeowners who don’t need one (unless they want one), and it’s been that way for the 35-plus years we’ve been operating in Nashville, TN. 

Unfortunately, it’s impossible for us to be on every roof in the Nashville area. So, I want to give you the signs that I and other roofers look for when determining if a roof is failing. 

By the end of this article, you’ll learn how the following are signs that your Nashville roof is failing:

  • Continuous roof leaks
  • Moss and vegetation growth
  • Cracked, curling, or missing shingles
  • Shingle delamination
  • Granular loss
  • Roof waviness and sagging
  • Discolored decking

Continuous roof leaks

A roof with continuous leaks is either failing due to improper installation or has reached its maximum lifespan. This is especially true if you have an older roof that has required frequent repairs. 

Now, roof leaks caused by common problems such as nail pops or a cracked pipe boot don’t mean a roof is failing. It’s even possible to experience multiple repairs on a single issue. 

However, frequent leaks in different roof areas are a sign of larger problems. That’s why the only solution for a failing roof with continuous leaks (especially an older one) is a complete replacement.

Moss and vegetation growth

Moss or other vegetation growth on shingles is usually a sign that your roof is starting to fail, and it’s time to get ready for a replacement. Moss shortens shingles’ lifespan, which is why manufacturers have special granule formulas to prevent moss growth for as long as possible.

moss growth on old asphalt shingle roof that needs to be replaced

So, if you see moss on your roof, there’s a good chance the shingles are starting to lose their full effectiveness. While this is more common on older roofs, moss can grow on roof areas that don’t get enough sunlight.

Just know it’s common for black streaks caused by algae growth to form on a 10 to 15-year-old roof. While the black streaks don’t look great, it doesn’t mean your roof is failing. 

Cracked, curling, or missing shingles

Seeing curling, cracked, and/or missing shingles are clear signs that your roof is starting to fail and needs a replacement. If shingles get to this point, it usually means your roof has reached the end of its lifespan. 

curling and cracking asphalt shingles

Unfortunately, improper installation and/or inadequate attic ventilation lead to shingle degradation much quicker. If this happens, your roof will fail prematurely and need replacing well before it should. 

Wind damage is also a common cause of missing shingles, but you’ll have an insurance claim if this happens.

Shingle delamination

While curling and cracking also play into this one, shingle delamination is a huge sign that your roof is failing. Asphalt shingles are made of layers of asphalt and protective granules on a fiberglass mat.

examples of delaminated shingles

Shingle delamination is simply the separation of these individual layers, which leads to the loss of structural integrity, protection, and adhesive properties. 

Obviously, shingles can’t perform their function correctly if they’re separating or peeling. So, shingle delamination is always a clear sign that a roof is failing. 

Granular loss

Granules are pieces of asphalt embedded in shingles for fire resistance, color, and UV ray protection. They are crucial to the longevity of an asphalt roof, and a roof loses them naturally as it ages. 

old asphalt shingle roof with extreme granular loss

However, severe or widespread granular loss is one of the biggest signs that a roof is failing. If it’s bad enough, you’ll find a lot of granules on the ground by downspouts and/or in your gutters. 

Just know hail also causes granular loss, whether it’s one large storm or multiple. 

Roof waviness and sagging

Roof decking is the wooden foundation that your entire roof system is installed on. Whether it’s from a prolonged leak or inadequate attic ventilation, the wood holds excess moisture.

wavy roof from failing shingle roof

This causes the decking to become wavy, which is a clear sign that a roof is failing due to improper installation and/or poor attic ventilation. However, the decking also loses its ability to hold nails and load-bearing capacity if it’s left to sit too long.

sagging in roof due to shingle roof failure

This causes severe sagging once the weight of the roofing materials starts to bear down on the compromised decking. If it gets to this point, you're most likely looking at complete roof failure.

Discolored decking

While waviness and sagging are clear signs of a failing roof, you can catch the complete failure before it happens by checking the decking from the attic. Finding discoloration on the bottom of the decking in your attic means has water soaked through the wood, which means the roofing materials are failing.

rotten roof decking from the bottom as seen in the attic

This could be from improper installation or the roofing materials maxing out, but either way, the structural issues we just talked about will happen if left to sit. On top of all this, the wetness creates a perfect environment for mold, mildew, and termites to thrive. 

What do you need to know before replacing your roof in Nashville, TN?

Now you know the signs that a roof is failing in Nashville, TN. Unfortunately, you’ll most likely need a roof replacement if your roof has any of the signs of failure mentioned here. 

However, you won’t know what your roof needs until after an inspection from a local Nashville roofing contractor. Just know that this begins the roof replacement process if you do have a failing roof, which is full of big decisions. 

On top of this, it’s also where Nashville homeowners get taken advantage of by bad roofers. I want you to be fully prepared when we or another Nashville roofer comes to your home. 

That’s why I wrote another article breaking down everything Nashville homeowners need to know before they get a new roof.

If you’re ready to get started, Get a Free Quote here or call our office at (615) 242-0333 today to schedule your free roof replacement estimate.

Check out 7 Things to Know Before Replacing Your Roof in Nashville, TN, to learn what you need to keep in mind when starting the roof replacement process.

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