A curtain wall repair has 18 vertical joints at 12 ft each and 9 horizontal joints at 28 ft each. What total sealant joint length is measured before waste?
Correct Answer
B) 468 lf
Vertical joints total 18 x 12 = 216 lf. Horizontal joints total 9 x 28 = 252 lf. Combined sealant length is 216 + 252 = 468 lf. Other choices omit one joint group or use the wrong joint count.
Why This Is the Correct Answer
Vertical joints total 18 x 12 = 216 lf. Horizontal joints total 9 x 28 = 252 lf. Combined sealant length is 216 + 252 = 468 lf. Other choices omit one joint group or use the wrong joint count.
Why the Other Options Are Wrong
Option A: 432 lf
sealant length, choice a: 432 lf omits a required add-on/subtraction; the numeric gap is 36.
Option C: 512 lf
sealant length, choice c: 512 lf adds an extra unstated add-on/subtraction; the numeric gap is 44.
Option D: 558 lf
sealant length, choice d: 558 lf adds an extra unstated add-on/subtraction; the numeric gap is 90.
Memory Technique
Say the sealant length rule aloud as a chain; the chain ends at 468 lf, not an intermediate stop.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Glazing sealant joint takeoff" to confirm that Vertical joints total 18 x 12 = 216 lf.
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