What is the primary function of a starter strip in shingle roofing?

What is the primary function of a starter strip in shingle roofing?

• A. Direct water into gutters and prevent seepage
• B. Provide a straight edge at the eaves and initial fastening points
• C. Exhaust hot, moist air from the attic
• D. Improve insulation

Answer: (B)

The main idea is that a starter strip creates a clean, straight starting edge and a solid first fastening surface for the roof. Placing a starter strip along the eaves sets up a true line for the first course of shingles, so the entire row stays aligned as you continue up the roof. It also provides a reliable spot to nail the initial shingles, helping them stay in place and resist wind uplift right from the bottom edge. This function is distinct from directing water into gutters (that’s handled by drip edges and gutters), venting attic air, or improving insulation, which are not the starter strip’s role.

The main idea is that a starter strip creates a clean, straight starting edge and a solid first fastening surface for the roof. Placing a starter strip along the eaves sets up a true line for the first course of shingles, so the entire row stays aligned as you continue up the roof. It also provides a reliable spot to nail the initial shingles, helping them stay in place and resist wind uplift right from the bottom edge. This function is distinct from directing water into gutters (that’s handled by drip edges and gutters), venting attic air, or improving insulation, which are not the starter strip’s role.