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Old 11-13-2011, 12:46 AM   #1
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Crack between aluminum window frame and stucco?


I moved into a house built in 1999 with a stucco exterior. I've noticed that most of the doors and windows have a cracks where the window frame meets the stucco. I was thinking of sealing the windows with caulk before winter, but as far as I can tell no caulk has ever been applied. Which makes me wonder if caulk wasn't used for a good reason.

I haven't noticed any water leakage, but I thought windows were supposed to be sealed. Is this a problem? Should I fill the cracks with caulk or some kind of stucco patch?

Attached images of door and window cracks.

Thanks
Attached Thumbnails
Crack between aluminum window frame and stucco?-doorcrack_sm.jpg   Crack between aluminum window frame and stucco?-windowcrack_sm3.jpg  

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Old 11-13-2011, 08:34 AM   #2
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Crack between aluminum window frame and stucco?


I’d caulk it. Use a polyurethane based caulk like “OSI Quad” or “Vulkem”.

It is critical though that you don’t block the weep holes at the bottom of the windows.

Your fixed windows (as in your pic) probably won’t have them but your operable windows will.

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Old 11-13-2011, 10:48 AM   #3
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Crack between aluminum window frame and stucco?


What "kwik" says -
Before you caulk it, you might want to add some type of "backer"
behind the caulk.
One of your pictures shows a rather, substantial gap -
between the stucco and the window.
Clean out the point where the stucco meets the window -
before you caulk it.

RF
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Old 11-13-2011, 11:07 AM   #4
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Crack between aluminum window frame and stucco?


kwiky's got it.

quad is a great product, so is Mulco's "Flex 9000", dynomic is also but cant be bought in big box stores its mainly available through whole salers
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Old 11-13-2011, 01:07 PM   #5
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Crack between aluminum window frame and stucco?


The vertical picture with the big crack, that I would need some backer for, is from a door. That appears to be a wood frame. Any suggestions for a backer?

The wide window picture actually is from an operable window, I just cropped it out to fit the picture under 100K. The weep holes are recessed in in the line you can see just above the crack. Thanks for reminding me of them.

I'm interested in your caulking brand suggestions. I have some DAP Alex Ultra for "Windows, Doors, etc." left over from the previous owner. I see on these forums that DAP is not a popular brand. I'll see if I can russle up some for the stuff you guys recommend.

Thanks.
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Old 11-13-2011, 01:17 PM   #6
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Crack between aluminum window frame and stucco?


Quote:
I'm interested in your caulking brand suggestions. I have some DAP Alex Ultra for "Windows, Doors, etc." left over from the previous owner. I see on these forums that DAP is not a popular brand. I'll see if I can russle up some for the stuff you guys recommend.
Alex

If you are buying from a HD find the Sika brand Polyurathane usually it is located near the concrete and mortar. The OSI quad is also stocked in the paint dept but with stucco I would use the Sika.
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Old 11-13-2011, 07:35 PM   #7
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Crack between aluminum window frame and stucco?


word of advise, never use any exterior grade caulking by alex... the only caulking by them thats worth using is DAP and thats for interior wood trim only
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Old 11-14-2011, 01:51 AM   #8
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Crack between aluminum window frame and stucco?


You have two dissimilar surfaces, which expand and contract at different rates, dependent upon weather, humidity, temperature, etc.

I would use a 100% silicone product. Any caulk that does not allow for varied expansion rates will eventually crack. Maybe some of the recommendations given have silicone in them but the caulk needs to move or it will crack.

What kind of window frame is that? Aluminum, vinyl or wood?

Last edited by JackOfAllTrades; 11-14-2011 at 01:53 AM.
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Old 11-14-2011, 03:13 AM   #9
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Crack between aluminum window frame and stucco?


"jrleek"
A backer could be foam, rubber, various materials -
(It could also, be considered a "bond breaker")

For caulk -
Quad, Vulkem, (Solar Seal 900 - if you can find it - Allied Supply, Richards
Supply, ABC Supply, a lumber yard: not at "big box" stores).

Don't use any of the "exterior" caulk, available at the "big box" stores -
other than "Quad". (Not "Pro Exterior", "PL Roofing/Siding", etc...)
"Quad" has good elasticity -
"Solar Seal" has 300% elasticity - it's "Extremely", adhesive - sticks
to everything/everyone!

RF

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