Can Roofing Nails Pop up and Allow Water to Leak In?

Roofing nails are driven through shingles and into the wooden roof deck or sheathing. Over many years, the wood framing in your attic naturally expands and contracts with seasonal humidity and temperature swings. This repeated movement can slowly push nails upward. Strong wind gusts lifting shingles can also apply upward pressure, gradually working nails loose from their original seated position.

In many climates, seasonal humidity and temperature swings are pronounced. Roof decking wood swells in summer humidity and shrinks in drier winter air. Each cycle can exert force on the nails. Older roofs or those installed with nails that were slightly under-driven are more susceptible to this gradual backing-out process.

You can sometimes spot popped nails from the ground using binoculars. Look for shiny nail heads that catch the light, as they should be covered by the next course of shingles. Also watch for shingles that appear wavy or have a corner lifting up. Inside your attic, use a bright flashlight during the day to look for tiny pinpoints of light coming through the roof deck.

Check for other signs like rust stains around nail heads on the roof surface, which indicate moisture. In the attic, look for dark water stains on the wood, especially near roof penetrations or along nail lines. Feel for dampness or soft spots on the sheathing. Remember, attic inspections require caution on ladder access and walking on joists to avoid falling through the ceiling.

If you see multiple popped nails, widespread staining, or suspect ongoing leaks, contact a roofer for a thorough evaluation. They can assess if the issue is isolated or a sign of broader roof failure. Simultaneously, if interior water damage is present, local water damage pros can address the resulting moisture to protect your home's structure and air quality.

Water from a roof leak can damage ceilings, walls, insulation, and framing. The pros have moisture meters and thermal imaging cameras to map the full extent of wet areas behind surfaces. They follow industry standards for drying to prevent secondary damage like mold. Acting quickly helps limit the repair scope and cost.

• You notice several shiny nail heads on your roof.
• Ceiling stains are growing or recurring after rain.
• You find active dripping in your attic.
• The roof decking feels soft or spongy in areas.
• There is a musty odor in your attic or upper floors.
• You are not comfortable working safely on a roof.