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Old 04-23-2010, 05:03 PM   #1
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Drip Cap for Window replacement


Does anyone know the correct placement for the drip cap on a window?
I have seen the drip cap placed directly on top of the window head before the trim is installed and I have also seen the drip cap placed over the top of the head trim. Very confusing as I am about to replace a window.

Thanks.

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Old 04-23-2010, 07:06 PM   #2
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Drip Cap for Window replacement


why not one on both

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Old 04-24-2010, 08:02 AM   #3
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Drip Cap for Window replacement


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why not one on both
In deed...
Is one more important than the other? Does code require both? I find it interesting that there isn't a uniform requirement for installing it on both the window and head trim piece. I see some instructions just suggesting adding a drip cap above the window and some only suggest adding to head trim. Here's a link for instructions to do both.
http://www.taunton.com/CMS/uploadedi...in/headcasing/
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Old 04-24-2010, 10:03 AM   #4
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Drip Cap for Window replacement


The one over the trim is mandatory in my book. The point is if any water gets behind the siding above that it can run down the felt over the top flange of your drip cap and drain out from the wall. That’s why flange of the drip cap “must” go behind the felt or it defeats purpose. That’s why you don’t caulk that joint and your siding should be held up ” so water can escape.
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Old 04-24-2010, 11:41 AM   #5
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Drip Cap for Window replacement


What joint are you referring to, that you do not caulk?
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Old 04-24-2010, 12:48 PM   #6
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Drip Cap for Window replacement


Between the top of your drip cap and the siding above but you do want a bead of caulk on top of the window trim then put the cap on top of the caulk so water can’t blow under the cap and get to the wall.
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Old 04-24-2010, 12:58 PM   #7
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Drip Cap for Window replacement


What about caulking between the window itself and the bottom of the head trim? Is that ok?
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Old 04-24-2010, 01:48 PM   #8
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Drip Cap for Window replacement


You can do that too.

1) A bead on top of window and set trim on that.

2) A bead on top of trim then set drip cap on that.

It’s called “Blind Caulking” it’s there you just cant see it.

Then hopefully your trim comes out farther than the window so you can caulk trim to window and trim to siding on the other side.

The Blind Caulking is a extra layer of protection for when (not if) the weather exposed caulking fails.
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Old 04-24-2010, 10:35 PM   #9
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Drip Cap for Window replacement


I disagree with the above reply. Flashing goes on top of the window. All caulking will fail over time, providing a point of water intrusion. Proper metal flashing will last a lifetime.

Depending on the type of trim and type of siding, you may also need flashing above the trim.
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Old 04-25-2010, 11:00 AM   #10
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I disagree with the above reply. Flashing goes on top of the window. All caulking will fail over time, providing a point of water intrusion. Proper metal flashing will last a lifetime.

Depending on the type of trim and type of siding, you may also need flashing above the trim.
Eisert,
What would you recommend for Hardieplank and Vinyl siding? Hardieplanks's installation guide suggests installing drip cap above trim.
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Old 04-25-2010, 12:59 PM   #11
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Drip Cap for Window replacement


[quote=Red Truck;433338]Eisert,
What would you recommend for Hardieplank and Vinyl siding? Hardieplanks's installation guide suggests installing drip cap above trim.[/quote]

I’ve sided 100+ homes and trimmed who knows how many windows on the Oregon Coast, land of the sideways rain. I know how to make things “not leak” . If there is no trim then you flash the window. If there is trim you caulk trim to the window and flash the top of the trim.

What are you doing, Hardi or Vinyl? Wood trim or Vinyl trim?
Makes a difference
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Old 04-25-2010, 01:21 PM   #12
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Drip Cap for Window replacement


Thanks kwikfishron!!
I think I have a good hold on the window replacement flashing.
I have also been hired to fix leaking windows that are covered with vinyl siding. Any thoughts, suggestions? I keep reading that vinyl siding and j-channels are notorious for leaking. Can I apply the same flashing techniques (Grace self adhearing flashing and aluminum drip cap) to windows covered with vinyl siding?? I haven't opened up anything yet so I don't know what I'll find.

Thanks for all the input!
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Old 04-25-2010, 01:22 PM   #13
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Drip Cap for Window replacement


[QUOTE=kwikfishron;433378]
Quote:
Originally Posted by Red Truck View Post
Eisert,
What would you recommend for Hardieplank and Vinyl siding? Hardieplanks's installation guide suggests installing drip cap above trim.[/quote]

I’ve sided 100+ homes and trimmed who knows how many windows on the Oregon Coast, land of the sideways rain. I know how to make things “not leak” . If there is no trim then you flash the window. If there is trim you caulk trim to the window and flash the top of the trim.

What are you doing, Hardi or Vinyl? Wood trim or Vinyl trim?
Makes a difference
Forgot to answer your question. Both the window replacement and leaking window having vinyl siding.
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Old 04-25-2010, 01:34 PM   #14
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Drip Cap for Window replacement


If you’ve been hired, you should know.
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Old 04-25-2010, 01:48 PM   #15
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Drip Cap for Window replacement


Since the window itself should be flashed to the house it makes more sense to flash above the trim
I have never seen 2 sets of flashing & that would not look right

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