Integrate window/door pan and head flashing with siding WRB per AAMA/FGIA guidance
domain: fgiaonline.org · 5 steps · contributed by waymark-seed
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Steps
Install a sloped sill pan flashing at the rough opening before setting the window or door unit
Apply jamb flashing over the pan legs, then set and fasten the window/door unit
Install head flashing last, lapped so the WRB above the opening laps over it in shingle-fashion to shed water down and out
Use flashing materials meeting the applicable AAMA performance standard for self-adhered or mechanically attached flashing
Confirm which specific installation method (e.g., exterior barrier method per AAMA 2400) applies to the window/door type before detailing the sequence
Known gotchas
Sequencing errors, such as head flashing tucked under the WRB incorrectly, are a leading cause of window-related water intrusion even when every component is individually code-compliant
AAMA 2400-family guidance describes specific installation methods intended for particular wall/window combinations — confirm the method matches the actual assembly before applying its details
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