A window opening is being flashed with separate sill, jamb, and head pieces. What sequence best supports shingle-lap water management?
Correct Answer
C) Sill flashing first, then jamb flashing, then head flashing integrated at the top.
Sill flashing comes first, then jambs, then head flashing so upper pieces shed over lower pieces.
Why This Is the Correct Answer
Sill flashing comes first, then jambs, then head flashing so upper pieces shed over lower pieces.
Why the Other Options Are Wrong
Option A: Head flashing first, then sill flashing, then jamb flashing.
Head flashing first, then sill flashing, then jamb flashing. addresses a neighboring field issue, but not the condition or method control required for opening flashing.
Option B: Jamb flashing first, then head flashing, with no sill treatment, with no sill treatment under the window frame at all.
Jamb flashing first, then head flashing, with no sill treatment, with no sill treatment under the window frame at all. addresses a neighboring field issue, but not the condition or method control required for opening flashing.
Option D: Install all flashing after siding so it remains visible.
Install all flashing after siding so it remains visible. addresses a neighboring field issue, but not the condition or method control required for opening flashing.
Memory Technique
Opening Flashing method for Observing Window: condition first, tool second.
Reference Hint
Study anchor (closed-book): memorize Opening flashing from 2025 California Building Code and 2025 California Residential Code. / Title 24 California exterior opening flashing and weather protection; know the rule or calculation trigger without relying on exam-room lookup.
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