Drip cap over new vinyl window: under or above trim

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Old 07-30-20, 09:02 AM
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Drip cap over new vinyl window: under or above trim

Hello,

Should the drip cap be installed to sit directly on top of the window or on top of the trim? I'm asking because something about installing it directly over the window seems wrong to me if you also seal the gap between the drip cap and the trim.
I've been reading the Andersen install instructions and they show the drip cap being installed directly on top of the new vinyl window. The house wrap then is flapped over the drip cap--presumably so any water that gets behind the house wrap can escape. But, then they show the use of backer rod and caulk around the perimeter of the window--between the window and the trim (or cladding if no trim is used).
That doesn't make sense to me since, by sealing around the perimeter, you have now trapped any moisture that may have, otherwise, escaped over the drip cap.
That's why I'm wondering if it's better to install the drip cap above the trim, seal between the trim and the window, and allow a gap above the cap.

Thanks in advance.
 
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Old 07-30-20, 09:13 AM
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I would put it over the trim. The window already has a flange.
 
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Old 07-30-20, 11:05 AM
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Thanks @XSleeper
Would you also have the house wrap lie over the top of the drip cap?
 
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Old 07-30-20, 11:07 AM
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Yep, just like the top fin of the window should be. You slit the corners at a 45 just enough to slip it in, then tape the slit.
 
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