Core TradesQuestion 115 of 700
Around a new window, the correct flashing sequence to integrate with the WRB is generally:
a.Head flashing first, then jambs, then sill
b.All four sides at once with sealant only
c.Sill flashing first, then jambs, then head flashing lapped over the WRB above
d.Only the head needs flashing
Explanation
The proper shingle-lap sequence is sill pan flashing first, then jamb flashing over the sill, then head flashing with the WRB above lapping over the head flashing, so each layer sheds onto the one below. Doing the head first, all at once with sealant, or head-only all trap water.
Law Reference: 2025 CA Building Code / CRC (Weather Protection)Practice all 700 questions free — no signup required.
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