Which nail technique ensures shingles sit flush against the surface?

• A. Nail straight and flush
• B. Nail at an angle
• C. Nail diagonally
• D. Nail into the void

Answer: (A)

Nailing straight and flush keeps the shingle tight to the surface. When the nail head is driven perpendicular to the plane and sits snug against the shingle, the material is pulled evenly against the surface, creating a flat, continuous appearance and a good seal against moisture and wind. If you nail at an angle or diagonally, the shingle can lift along the edge and leave gaps, making the surface look uneven and increasing the risk of leaks or wind damage. Driving into a void fails to secure the shingle properly, so it won’t sit flat or stay in place. So the straight, flush nail technique is what makes shingles lie flush.