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Carpenter Red Seal Exam Prep · Question

When installing window flashing, which component plays the most critical role in diverting water from the jambs to the sill flashing?

End dams, or upturned edges, on the sill pan flashing are crucial. They prevent water that collects on the sill from running off the ends and into the wall cavi

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Question: When installing window flashing, which component plays the most critical role in diverting water from the jambs to the sill flashing?

Answer options:

  • Head flashing
  • Sill pan flashing
  • Jamb flashing ✅ End dams on the sill flashing

Correct answer: End dams on the sill flashing

Explanation: End dams, or upturned edges, on the sill pan flashing are crucial. They prevent water that collects on the sill from running off the ends and into the wall cavity, instead directing it outward or to drain holes.

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