noun / verb
shingle
SHING-gul/ˈʃɪŋɡl/
A thin overlapping piece used for a surface covering.
Each shingle overlaps the one below it to keep rain out.

Etymology
Latin scindula named a wooden slat or roof tile and came from scindere, “to split.” The roofing sense preserves the image of thin split wood used as a covering.
In context
the installer of this roof initially only used as i said about four nails per shingle
More examples
- Several shingles are missing from the roof after the storm.
- Cedar shingles cover the cottage's outer walls.
- The crew shingles the garage roof before the rain starts.
Forms
shingle · shingles · shingled · shingling
shingler noun — A worker who installs roof shingles.