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Window Flashing Tape Failure?

 
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Old 04-23-2015, 07:43 PM   #1
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Window Flashing Tape Failure?


We replaced a window during a kitchen remodel last summer and the original flashing tape from when the house was built in 2003 was toast. The tape was cracked all the way through in spots at the line where it overlapped onto the nailing flange. You can see where I stuck my finger through it and pulled on it.

Window faces west so gets afternoon sun. Has anyone else seen this or have any ideas on whats going on?
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Old 04-23-2015, 09:43 PM   #2
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Re: Window Flashing Tape Failure?


There continually making improvements to tape formulas for good reasons; with that possibly dried out, to much UV, wrong substrate for the tape...

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Old 04-23-2015, 10:22 PM   #3
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Re: Window Flashing Tape Failure?


I have found this on 4 window or door replacements. I don't know if it's the Western exposure and/or the MN cold winters, but the flashing tape is crap!!! This is usually a white tape, but I did have a black one too.

It makes me want to go back and tear apart one of my protecto tape jobs. That is all I use. Now I want to expose any failure, if any/none.
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Old 04-26-2015, 12:55 PM   #4
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Re: Window Flashing Tape Failure?


reverse lap..water is getting under the tape,seems to be just at the head
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Old 04-26-2015, 05:35 PM   #5
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by Tom Struble View Post
reverse lap..water is getting under the tape,seems to be just at the head
It looks like reverse lap onto tar paper but is actually just the tape stuck to the sheathing which is black Bild-rite.........no paper or house wrap on this house:roll eyes:. You're right either way though, that water was able to sneak behind at the top of the tape.

Any ideas on why the tape would crack if a little water got behind it? Maybe the water froze and pooched it out?
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Old 04-26-2015, 06:35 PM   #6
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Re: Window Flashing Tape Failure?


I think some vinyl windows ate the tape up, but that doesn't seem to be your issue. Maybe seasonal movement weakened it?
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Old 04-26-2015, 06:57 PM   #7
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by Morning Wood View Post
I think some vinyl windows ate the tape up, but that doesn't seem to be your issue. Maybe seasonal movement weakened it?
It looks like a combination of all the issues already mentioned in the thread. I would guess that if the tape could actually adhere to the surface it was on, the reverse lap wouldn't be as big of an issue. ZIP system really doesn't have a lap over the tape, but the tape has such an aggressive acrylic binder that the water isn't going to get behind it. But I don't think any tape really sticks to that old Celotex stuff good.
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Old 04-26-2015, 07:54 PM   #8
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Re: Window Flashing Tape Failure?


I didn't mention it, but the window was replaced with a taller window to let more light into the kitchen, not to replace a leaky or rotten window. There was evidence that some moisture had gotten behind the flashing but we did not need to replace any sheathing.
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Old 04-26-2015, 08:02 PM   #9
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by EricBrancard View Post
It looks like a combination of all the issues already mentioned in the thread. I would guess that if the tape could actually adhere to the surface it was on, the reverse lap wouldn't be as big of an issue. ZIP system really doesn't have a lap over the tape, but the tape has such an aggressive acrylic binder that the water isn't going to get behind it. But I don't think any tape really sticks to that old Celotex stuff good.
I love the Advantec subfloor but haven't used the Zip system. I would have a hard time trusting that tape to stay stuck forever.
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Old 04-26-2015, 08:45 PM   #10
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by Windwash View Post
I love the Advantec subfloor but haven't used the Zip system. I would have a hard time trusting that tape to stay stuck forever.
I used it on my own home. I trust it.
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Old 04-28-2015, 09:20 AM   #11
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by Windwash View Post
It looks like reverse lap onto tar paper but is actually just the tape stuck to the sheathing which is black Bild-rite.........no paper or house wrap on this house:roll eyes:. You're right either way though, that water was able to sneak behind at the top of the tape.

Any ideas on why the tape would crack if a little water got behind it? Maybe the water froze and pooched it out?
idk..but water being the ''universal solvent''possibly some kind of damaging chemical is formed between the tape the vinyl and the composite sheathing
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Old 04-28-2015, 09:32 AM   #12
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Re: Window Flashing Tape Failure?


Tape has to be installed taking into consideration gravity... from the pic, it doesn't look to me like it was... there's nothing preventing the water from getting behind the tape... paper should have been cut back and overlap onto tape after tape being installed and seams taped with skip taping on the window edge... Tape should go over the flange... tape LOVES vynil...

Tape install works from the bottom up so all tape edges are covered and water can't get a vertical hold...

.

Last edited by KAP; 04-28-2015 at 09:35 AM.
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Old 04-28-2015, 09:36 AM   #13
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Re: Window Flashing Tape Failure?


it's Celotex sheathing kap..no paper..perhaps installing some after taping would have prevented it,but that would depend on the particular placement and jobsite conditions
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Old 04-28-2015, 09:43 AM   #14
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by Tom Struble View Post
it's Celotex sheathing kap..no paper..perhaps installing some after taping would have prevented it,but that would depend on the particular placement and jobsite conditions
You're right... was focused on the tape...

Still... Tape install is bottom up... bottom (behind flange and protecting sill and corner side allowing any water that gets through to vent and not build up), then sides going up and about same width of tape past top (installed over flange into corners - window side and top should already be caulked) and then top top is taped across that with house wrap going down on top of that with seams taped... water has nowhere to go but down and doesn't touch the tape edge as in the pic...

Same principle as paper over paper... if you look at the 2nd and 3rd pic the tape on the flange is still pretty solid as it overlaps the flange... it's a failing above this point because water can get to it on the vertical...

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Last edited by KAP; 04-28-2015 at 11:04 AM.
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Old 05-02-2015, 08:59 AM   #15
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Re: Window Flashing Tape Failure?


That black board celotex should be outlawed. It was used all over the place here for decades. We retrofit windows and tape them properly, but the Celotex is so porous, I sometimes wonder, what's the point.
Fwiw, protectowrap superstick stays put on that carp. The 3m tape does it almost as well.
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Old 05-02-2015, 09:59 AM   #16
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by KAP View Post
You're right... was focused on the tape...

Still... Tape install is bottom up... bottom (behind flange and protecting sill and corner side allowing any water that gets through to vent and not build up), then sides going up and about same width of tape past top (installed over flange into corners - window side and top should already be caulked) and then top top is taped across that with house wrap going down on top of that with seams taped... water has nowhere to go but down and doesn't touch the tape edge as in the pic...

Same principle as paper over paper... if you look at the 2nd and 3rd pic the tape on the flange is still pretty solid as it overlaps the flange... it's a failing above this point because water can get to it on the vertical...

.
That window appears to be lapped correctly.
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Old 05-02-2015, 11:52 AM   #17
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by slowsol View Post
That window appears to be lapped correctly.
Lapped correctly (bottom up) and installed correctly are two different things...

Water has entry points from top to bottom in that photo...

.

Last edited by KAP; 05-02-2015 at 12:04 PM.
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Old 05-02-2015, 12:20 PM   #18
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Re: Window Flashing Tape Failure?


Quote:
Originally Posted by KAP View Post
Lapped correctly (bottom up) and installed correctly are two different things...

Water has entry points from top to bottom in that photo...

.

I'm confused. The building doesn't have paper on it. Is that what you mean? What else is incorrectly installed on that window?
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Old 05-02-2015, 02:46 PM   #19
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Re: Window Flashing Tape Failure?


i think he's looking at the j channel and thinking it's the flange?
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Old 05-09-2015, 09:04 AM   #20
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Re: Window Flashing Tape Failure?


If you have to tape on top of the Celotex, Eternabond WS tape will stick and you will never have a problem.

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