When using a mason's line to build a wall, how far should the string be from the wall?

When using a mason's line to build a wall, how far should the string be from the wall?

• A. 1/4 inch
• B. 1/8 inch
• C. 1/2 inch
• D. 1/16 inch

Answer: (D)

When you set a mason’s line, you want a reference that mirrors the wall as closely as possible without rubbing against it. Keeping the string a tiny, consistent distance from the wall—about 1/16 inch—gives you a true reference plane for the face of the wall while avoiding contact that could smear the line or grab on uneven sur­faces. That small gap also accounts for the thickness of mortar joints and minor wall irregularities, so the line stays a reliable guide as you lay bricks. If the line were farther away, it wouldn’t track the actual wall face as accurately, and any bowing or irregularities in the wall would be harder to detect. If it were pressed right against or extremely close to the wall, it could rub off mortar or snag on protrusions, making readings unreliable. A 1/16 inch gap balances accuracy and practicality.

When you set a mason’s line, you want a reference that mirrors the wall as closely as possible without rubbing against it. Keeping the string a tiny, consistent distance from the wall—about 1/16 inch—gives you a true reference plane for the face of the wall while avoiding contact that could smear the line or grab on uneven sur­faces. That small gap also accounts for the thickness of mortar joints and minor wall irregularities, so the line stays a reliable guide as you lay bricks.

If the line were farther away, it wouldn’t track the actual wall face as accurately, and any bowing or irregularities in the wall would be harder to detect. If it were pressed right against or extremely close to the wall, it could rub off mortar or snag on protrusions, making readings unreliable. A 1/16 inch gap balances accuracy and practicality.