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.
For this detail, install the sill treatment first, overlap it with jamb flashing, then integrate the head flashing and wall drainage plane so water sheds outward. Follow the applicable window and flashing instructions; the sequence is not permission to omit required seals or drainage openings. Source: https://basc.pnnl.gov/resource-guides/windows-and-doors-are-fully-flashed
Why This Is the Correct Answer
For this detail, install the sill treatment first, overlap it with jamb flashing, then integrate the head flashing and wall drainage plane so water sheds outward. Follow the applicable window and flashing instructions; the sequence is not permission to omit required seals or drainage openings. Source: https://basc.pnnl.gov/resource-guides/windows-and-doors-are-fully-flashed
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