If you’ve noticed small bumps, raised shingles, or even exposed nail heads on your roof, you may be dealing with something known as roofing nail pops.
Roofing nails are supposed to remain securely fastened beneath the shingles. When they begin pushing upward, they can lift the shingles, break the protective seal, and eventually create an opening where water can enter your home.
While one nail pop may not seem like a major problem, multiple nail pops can be a warning sign that your roof needs attention.
What Is a Roofing Nail Pop?
A roofing nail pop occurs when a roofing nail begins working its way upward out of the roof decking.
Instead of sitting flat beneath the shingle, the nail pushes against the underside of the shingle. Over time, this pressure can cause the shingle to rise or create a noticeable bump.
Eventually, the nail may even push completely through the surface of the shingle.
Once that happens, the roof's waterproof barrier has been compromised.
Why Do Roofing Nails Start Popping Up?
There are several reasons roofing nails can begin backing out of a roof.
Expansion and Contraction of the Roof
Your roof experiences constant temperature changes.
During hot weather, roofing materials and roof decking expand. When temperatures drop, those materials contract.
This repeated movement can slowly loosen roofing nails.
In the Chicagoland area, roofs experience extreme temperature swings throughout the year. A roof may deal with intense summer heat, freezing winter temperatures, snow, ice, and repeated freeze-and-thaw cycles.
Over many years, those conditions can contribute to nail movement.
Nails Were Not Installed Correctly
Improper installation is another common cause of nail pops.
Roofing nails need to be driven to the correct depth.
If a nail is not driven far enough into the roof decking, it may eventually work itself upward.
On the other hand, nails that are driven too deeply can damage the shingle and weaken the attachment point.
Proper nail placement is an important part of professional roof installation.
Roof Decking Movement
Roofing nails are driven into the wood decking beneath the shingles.
Wood naturally expands and contracts when exposed to changes in temperature and moisture.
If the roof decking moves, warps, or experiences moisture-related changes, it can gradually push nails upward.
Older roof decking may also provide less holding strength than newer decking.
The Wrong Type or Length of Nail Was Used
Roofing nails need to properly penetrate the roof decking.
If nails are too short, improperly sized, or not designed for roofing applications, they may not have enough holding power.
Over time, they can loosen and begin backing out.
High Winds and Severe Weather
Strong winds place tremendous pressure on roofing shingles.
When wind repeatedly lifts or moves shingles, the fasteners underneath can become stressed.
After years of storms, high winds, hail, and severe weather, roofing nails can sometimes begin loosening.
This is one reason homeowners should periodically have their roof inspected after significant storms.
Are Nail Pops Dangerous?
A roofing nail pop is usually not an immediate emergency, but it should not be ignored.
The biggest concern is water intrusion.
When a nail pushes through a shingle, it creates a small hole in the roofing system. Rainwater can eventually enter around the nail and travel into the roof decking.
Over time, this moisture can contribute to:
The damage caused by a nail pop may become much more expensive than repairing the original roofing issue.
Can Nail Pops Cause Shingles to Blow Off?
Yes.
When a nail begins pushing upward, it may lift the shingle above it.
This can weaken the shingle's seal and make it easier for wind to get underneath the roofing material.
During a severe storm, lifted shingles are more vulnerable to tearing or being blown completely off the roof.
Should You Hammer Roofing Nails Back Down?
Simply hammering a popped roofing nail back into place is usually not the best long-term repair.
Once a nail has loosened, the original hole in the roof decking may no longer provide the same holding strength.
A professional roofer may need to remove or reposition the nail, install a new fastener in a secure location, and properly seal the affected area.
The surrounding shingles should also be inspected for damage.
How Do I Know If My Roof Has Nail Pops?
Some roofing nail pops are visible from the ground, while others are difficult to see without getting close to the roof.
Signs can include:
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Small raised bumps in shingles
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Exposed nail heads
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Shingles that appear lifted
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Loose or uneven shingles
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Small holes in shingles
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Water stains inside the attic or home
Homeowners should avoid climbing onto steep or damaged roofs to inspect these areas themselves.
A roofing professional can safely inspect the roof and determine whether nail pops are isolated or part of a larger roofing problem.
Are Nail Pops a Sign That I Need a New Roof?
Not necessarily.
A few isolated nail pops can often be repaired.
However, widespread nail pops may indicate that the roofing system is aging or that there are problems with the original installation or roof decking.
If your roof is already approaching the end of its expected lifespan, frequent nail pops may be one of several signs that replacement should be considered.
Other warning signs can include:
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Curling shingles
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Cracked shingles
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Missing shingles
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Significant granule loss
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Sagging roof decking
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Recurring leaks
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Widespread storm damage
A professional inspection can help determine whether repairs are sufficient or whether roof replacement makes more sense.
Why Nail Pops Shouldn't Be Ignored
Roofing problems often begin small.
A single exposed nail may only create a tiny opening today, but repeated rain, snow, freezing temperatures, and storms can make the problem worse.
Finding and repairing nail pops early can help protect the roof decking and prevent water from reaching the interior of your home.
Have You Noticed Raised Shingles or Exposed Nails?
If you see bumps in your shingles, exposed roofing nails, loose shingles, or other signs of roof damage, Keystone Exteriors can inspect your roofing system and determine what is causing the problem.
Whether the issue is a few loose fasteners, storm damage, aging shingles, or a larger roofing concern, identifying the cause early can help prevent more expensive damage later.
Contact Keystone Exteriors today to schedule a roof inspection and make sure your home stays protected.