The overhang for the starter course of wood shingles should be:

The overhang for the starter course of wood shingles should be:

• A. 1/4"
• B. 3/4"
• C. 1 1/2"
• D. 2"

Answer: (C)

The starter course must project far enough at the eave to shed water properly and to set the correct projection for the courses that follow. An overhang of 1 1/2 inches gives ample distance beyond the drip edge so water drips cleanly off the edge and isn’t drawn back toward the roof by capillary action. It also allows the next rows to sit square and cover the starter nails, producing a neat, weather-resistant edge. Too little overhang (such as 1/4" or 3/4") won’t provide adequate drainage and could expose nail lines or misalign subsequent courses, while too much (like 2") isn’t necessary and can complicate installation or increase wind uplift risk.

The starter course must project far enough at the eave to shed water properly and to set the correct projection for the courses that follow. An overhang of 1 1/2 inches gives ample distance beyond the drip edge so water drips cleanly off the edge and isn’t drawn back toward the roof by capillary action. It also allows the next rows to sit square and cover the starter nails, producing a neat, weather-resistant edge. Too little overhang (such as 1/4" or 3/4") won’t provide adequate drainage and could expose nail lines or misalign subsequent courses, while too much (like 2") isn’t necessary and can complicate installation or increase wind uplift risk.