What Is a Drip Cap?
Windows and doors interrupt the exterior wall.
Rainwater moving down the wall needs to be directed around those openings.
One component that helps at the top is commonly called:
A drip cap
or
Head flashing.
What Does It Do?
The flashing sits above the opening and helps direct water outward rather than allowing it to move behind:
- Window frame
- Door frame
- Exterior trim
It forms part of the larger wall water-management system.
Why Is the Top of the Opening Important?
Gravity moves water downward.
If water reaches the top edge of a window or door and enters behind the exterior finish, it can potentially travel into the wall assembly.
Correct head flashing creates a controlled path back outside.
Does Caulk Replace Flashing?
Sealant can be part of an exterior installation.
But it should not be treated as the only water-management strategy.
Proper flashing relies on:
- Layering
- Overlap
- Drainage
rather than assuming one bead of caulk will remain perfect forever.
How Does It Work With Siding?
The wall’s water-resistive barrier, flashing, siding, and trim need to be integrated.
Water should always be directed:
down
and
out.
Why Is It Easy to Miss?
Once siding and trim are installed, much of the flashing is hidden.
That means workmanship during installation is critical.
The Most Important Part Above a Window May Be the Piece You Barely See.
Envirotech Exteriors considers window and door flashing together with siding and exterior trim so water is managed around the complete opening—not just the visible frame.