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Old 04-04-2019, 06:15 PM   #1
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New Stucco cracks


Hello,


I just had a wall re-stucco'd. They did the job pretty quickly, and later that same day a lot of hairline cracks became visible. Is this going to be a problem? It doesn't seem right, but I'm not sure. See attached images.



Thanks!
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New Stucco cracks-img_20190404_123629.jpg   New Stucco cracks-img_20190404_123711.jpg  
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Old 04-04-2019, 06:40 PM   #2
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Re: New Stucco cracks


The Stucco dried it did not hydrate which caused the cracking. If this was an over lay of existing Stucco yes it will fail , it will delaminate. Stucco should be keep damp for a period of about 48 hours @ a humidity of around 70%.
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Old 04-04-2019, 07:32 PM   #3
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Re: New Stucco cracks


This was the only coat, over plywood and lathe, and black paper. Do you think this is bad?
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Old 04-04-2019, 08:17 PM   #4
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Re: New Stucco cracks


Yes that was not a good idea to use a one coat Stucco over a plywood substrate. A one coat Stucco would be about 3/8 inch thickness Stucco over a wood substrate should be 3/4 to 7/8 inches in thickness. The plywood under the Stucco would expand when moist from the wet Stucco applied over it when it dries it will shrink & cause the Stucco to crack, also keep in mind that Stucco must have a moisture of about 70% to cure if it dries out it will crack. My guess is it will get worse with temp. & humidity changes.
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Old 04-05-2019, 06:28 AM   #5
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Re: New Stucco cracks


I'm accustomed to 1 coat stucco over cinder block but I've never seen anyone do just 1 coat over lath. ..no scratch coat??
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Old 04-05-2019, 06:49 AM   #6
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Re: New Stucco cracks


Another problem that could cause the cracking in that type pattern is the Lath was attached with staples & the staples did not penetrate the studs or were placed in the plywood only.
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Old 04-05-2019, 09:01 AM   #7
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Re: New Stucco cracks


All of the work was done by the end of the afternoon, so I'm assuming that would indicate a single coat. Is that right?
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Old 04-05-2019, 10:00 AM   #8
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Re: New Stucco cracks


Quote:
Originally Posted by mxdsa View Post
All of the work was done by the end of the afternoon, so I'm assuming that would indicate a single coat. Is that right?
Correct that is a ONE COAT Stucco.
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Old 04-05-2019, 10:03 AM   #9
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Re: New Stucco cracks


I'll have to have a chat with the contractor. Thanks for the information!
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Old 04-14-2019, 08:44 AM   #10
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Re: New Stucco cracks


traditional hardcoat OR synthetic ? 2 different methods/mtls
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