A stair stringer has an overcut beyond the tread-riser intersection at a high-stress corner. The carpenter suggests leaving it because trim will cover the cut. What should the superintendent require?
Correct Answer
B) Replace the stringer or obtain an approved repair before installation
Overcuts at stringer notches can weaken a critical member; the stringer should be replaced or repaired using an approved detail. Other choices conceal or lightly patch a structural cut.
Why This Is the Correct Answer
Overcuts at stringer notches can weaken a critical member; the stringer should be replaced or repaired using an approved detail. Other choices conceal or lightly patch a structural cut.
Why the Other Options Are Wrong
Option A: Cover the overcut with trim and proceed
Choice A gives Cover the overcut with trim and proceed. Its specific error: the option does not produce the required Stair stringer outcome, Replace the stringer or obtain an approved repair before installation.
Option C: Base the stair stringer response on fill the kerf with construction adhesive only
In wood framing, Fill the kerf with construction adhesive only is the wrong selection for Stair stringer: the action skips the timing, documentation, or field-control step needed for Stair stringer.
Option D: Add one finish nail at the overcut, leaving stair stringer unverified
The trap in D is Add one finish nail at the overcut. That selection is wrong because it leaves out the controlling Stair stringer result: Replace the stringer or obtain an approved repair before installation.
Memory Technique
Remember stair stringer by its jobsite consequence: the correct move points to Replace the stringer or obtain an approved repair before installation.
Reference Hint
Open Carpentry and Building Construction, 2016; use the index entry or section for "Stair stringer layout and cutting quality" to confirm that Overcuts at stringer notches can weaken a critical member; the stringer should be replaced or repaired using an approved detail.
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