The front rim of a gutter must be ___ below the back edge and it should be below the nailers used to elevate the roof edge

• A. 1/2 inch
• B. 1 inch
• C. 1 1/2 inch
• D. 2 inches

Answer: (B)

In gutter installation, the vertical relationship between the roof edge, the gutter, and the nailers that support the roof edge matters for proper drainage and for avoiding interference with the roof structure. The front rim of the gutter needs to sit about one inch below the back edge. This creates enough vertical clearance so the nailers used to elevate the roof edge don’t crowd or push against the gutter, while still keeping the gutter lip in the right position to catch runoff from the roof.

If the gap were smaller, the nailers could contact the gutter or crowd it, causing misalignment or damage. If it were larger, the gutter would sit too far down, which can hinder water entry into the gutter and disrupt the intended drip/edge details. So one inch balances clearance for installation components with effective gutter drainage.