Which of the following represents the correct clearance of a string line from a cinder block wall?

Which of the following represents the correct clearance of a string line from a cinder block wall?

• A. 1/16
• B. 1/8
• C. 3/16
• D. 1/4

Answer: (A)

Keep the string line as close as possible to the wall because it serves as the reference for the true face of the finished block wall. A tiny clearance—about 1/16 inch—keeps the line just clear of rough block surfaces and cured mortar while still reflecting the wall’s final alignment after joints are formed. If the line sits farther away, small irregularities in block dimensions or mortar thickness become magnified, leading to misalignment over the length of the wall. Larger gaps (1/8, 3/16, or 1/4 inch) would introduce more potential for error because the line would no longer track the actual face as accurately.

Keep the string line as close as possible to the wall because it serves as the reference for the true face of the finished block wall. A tiny clearance—about 1/16 inch—keeps the line just clear of rough block surfaces and cured mortar while still reflecting the wall’s final alignment after joints are formed. If the line sits farther away, small irregularities in block dimensions or mortar thickness become magnified, leading to misalignment over the length of the wall. Larger gaps (1/8, 3/16, or 1/4 inch) would introduce more potential for error because the line would no longer track the actual face as accurately.