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Roofing · Small holes, worth sealing

Nail heads visible through the shingle surface

Nail pops happen as the decking moves, and each one is a hole. They are inexpensive to seal one at a time and expensive to ignore across a whole roof.

Quick answerNail pops happen as the roof decking moves with seasons and moisture, pushing nails back up through the shingle above them. Each raised nail is a hole and can tear the shingle that covers it. They are inexpensive to seal individually. Left alone across a whole roof, they turn into many small leaks and rotted decking.

A few pops on an older roof are common. Dozens across every slope point to a deck or nailing problem that the next roof should fix, not just cover.

This is most common in homes built roughly 1940 to 1980. Post-war and mid-century — copper supply, aging cast iron stacks, 60 to 100 amp panels, first-generation central air.

1Why nails back out

  • Deck movement. Wood decking swells and shrinks with heat and moisture. Each cycle works nails up a little.
  • Nails that missed solid wood. A nail driven into a gap between boards or the edge of a sheet has little to hold.
  • Short or underdriven nails. Nails that don’t reach far enough into the deck, or weren’t driven flush, lift more easily.
  • Moisture in the attic. Poor ventilation keeps the deck damp, which adds to the movement.

2How to check it

  1. Look across the slope from the groundUse binoculars in low sun. Pops show as small bumps or tented spots in the shingle.
  2. Count themA handful in one area is a repair. Many on every slope is a pattern worth asking about.
  3. Check the atticOn a dry day look for nails that missed framing and for water stains around them.
  4. Note attic dampnessFrost or condensation on nails in winter points to ventilation, not just nailing.

3Fixing it

Do it yourself

  • Spotting and counting pops from the ground
  • Checking the attic for wet spots
  • Keeping a photo record of where they are

Hire a pro

  • Resetting or replacing the nail and sealing the old hole
  • Replacing shingles torn by a raised nail
  • Diagnosing widespread pops as a deck or ventilation issue

The usual repair is to pull or reset the popped nail, add a new fastener into solid wood nearby, and seal the old hole under the shingle. Dabbing sealant on top of a raised nail head does not stop it rising again.

Roof safety

Working on shingles means walking the roof. Breaking the sealant bond between courses on a cold day can crack shingles. Leave this to someone with the right footing and fall protection.

4What drives the cost

A few pops are a small service call. The price climbs with the number of pops, how many shingles need replacing, roof pitch and height, and whether the decking needs work. Widespread pops on an aging roof can shift the conversation to replacement.

Roofing cost

Nail heads showing across the roof?

Talk to a roofer who will reset and seal them, and check why the deck is moving.

877-360-4657

5Questions

Can I hammer the nail back down?

It will come back up. The nail has lost its grip, so the fix is a new fastener into solid wood and a sealed hole.

Do nail pops mean the roof was installed badly?

Not always. Some movement is normal over decades. Many pops on a younger roof are more likely a nailing problem.

Will the next roof fix this?

Only if the deck is checked and re-fastened where needed. Ask for that in writing.

Written by Jaylan Jones. I Like To Exterior Services earns a referral fee when a call connects to a contractor. See our business-model disclosure.

877-360-4657