While preparing the material-order review for the retail demising-wall phase, the slab strip is 138 ft long and saw-cut joints are placed at 5 ft on center, including one at the starting end. How many saw-cut joints are needed?
Correct Answer
B) 28 saw-cut joints
Count the spaces along the run, then include the starting item.
Why This Is the Correct Answer
Count the spaces along the run, then include the starting item.
Why the Other Options Are Wrong
Option A: 29 saw-cut joints
29 saw-cut joints is above the supported result for control-joint layout; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option C: 30 saw-cut joints
30 saw-cut joints is above the supported result for control-joint layout; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 31 saw-cut joints
31 saw-cut joints is above the supported result for control-joint layout; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Joint Layout cart for Foreman Checks: count first, spaces second, whole units last.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Concrete slab control joints; spacing layout; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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