It is a tiny defect.

One nail.

One raised spot.

How serious could it be?

A roof nail pop occurs when a roofing fastener begins rising above the surface it was intended to secure.

IKO identifies several potential causes, including nails that were under-driven, nails that did not properly penetrate the decking, and warped or moving roof decking.

The nail may be small.

But roofing works by directing water over uninterrupted surfaces.

An exposed fastener can interfere with that system.

What Causes Roofing Nails to Back Out?

Possible reasons include:

Improper fastening

A nail may not have been driven to the correct depth.

Insufficient deck penetration

The fastener may not have properly engaged the roof deck.

Roof-deck movement

Warping or movement beneath the shingles can push fasteners upward.

Previous installation problems

Older roofing work or poor fastening patterns may eventually become visible as the roof ages.

Can a Nail Pop Cause a Leak?

Potentially.

If the raised nail damages the shingle or creates an opening, water has a pathway that was not intended to exist.

That does not mean every nail pop has already caused interior damage.

It means it should be repaired correctly rather than ignored.

Don’t Just Hammer It Back Down

This is one of the most important points.

IKO specifically advises against simply hammering a popped nail back into the same hole. The original fastening location may no longer provide reliable water protection or secure attachment.

A proper repair may require:

• Lifting or replacing the affected shingle
• Removing the old fastener
• Correcting the fastening point
• Properly dealing with the original hole

This is a small repair—but one where the details matter.

When Do Nail Pops Suggest a Bigger Problem?

One isolated nail may simply be a localized installation defect.

Multiple nail pops across the roof deserve broader investigation.

Ask:

• Is the decking moving?
• Is moisture present?
• Are shingles buckling?
• Are fasteners consistently misplaced?
• Are other roof defects appearing?

CMHC maintenance guidance also lists popped nails among roof conditions homeowners should watch for during routine inspections.

Look for the Cause, Not Just the Nail

NanoTech’s roofing approach is built around identifying the source of a problem before recommending a larger solution. Current services include inspection, preventive maintenance, repair, replacement, and rejuvenation.

A nail pop doesn’t mean:

“You need a new roof.”

It means:

“This needs to be checked and repaired correctly.”

Small Roof Problems Are Cheapest While They’re Still Small.

Seeing exposed fasteners, raised shingles, or unusual bumps on your roof? Have NanoTech Exteriors identify the cause before water finds the opening.