How can you verify that fasteners have been correctly driven without damaging shingles?

• A. Drive nails as deep as possible even if it crushes the shingle.
• B. Check that nail heads are flush or slightly below the shingle surface (without crushing the tab).
• C. Leave nails protruding above the surface for quick removal.
• D. Use screws instead of nails.

Answer: (B)

The main idea is that fasteners must be secured without deforming the shingle. You verify this by ensuring nail heads are flush with or just below the shingle surface, but not crushing the tab. This position holds the shingle firmly to the roof deck while preserving the shingle’s integrity and preventing leaks. Driving nails too deep crushes the shingle, which weakens it and can cause water intrusion or cracking. Leaving nails protruding can catch water or lift in wind, compromising durability. Using screws instead of nails isn’t standard for asphalt shingles and can affect performance and warranty. So, the best practice is: nail heads flush or slightly below the surface, without crushing the tab.