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Old 07-23-2011, 07:44 PM   #1
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dark block lines after parging


I've recently had our foundation walls parged and while it lookes great there are dark lines on the walls, outlines of the concrete block underneath the new stucco. The walls pictured are fully dryed but look wet because of the lines. The material used was sand and Type S cement, the contractor put two coats on in one day. I don't want to paint to hide the problem.

Did he need to wait in between coats? Can a third coat fix the lines? Was the materials wrong? I'll need to fix this issue myself so any help is appreciated.
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Old 07-23-2011, 08:11 PM   #2
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dark block lines after parging


I see no problems here. Moisture will stay longer in the less dense ares such as brick mortar. Don't expect this problem to go away. Moisture and high humidity will continue to highlight these areas. This should be painted/sealed with a protective coating.

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Old 07-24-2011, 08:34 AM   #3
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dark block lines after parging


Thanks for the reply and I had intended to seal the new stucco with a clear sealer but I'm looking at this as a problem aesthetically. The entire reason for the project was to modernize the look of the house by getting rid of the block. I have some very high foundation walls and now all these lines are very noticable.
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Old 07-25-2011, 11:32 AM   #4
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dark block lines after parging


I have been in my new house for a year now and the lines are still visible.
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Old 07-25-2011, 11:47 AM   #5
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dark block lines after parging


You could always get some stick on X and O's well you get the idea.

Some mortar colored paint made for this application would finish it off.

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Old 07-25-2011, 07:07 PM   #6
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dark block lines after parging


Honestly is there not a better solution? Painting my concrete to look like concrete wasn't what I had in mind! Would a third coat solve this? Thanks.
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Old 07-25-2011, 11:57 PM   #7
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dark block lines after parging


I would try a solvent based siloxane sealer if I were you. Excellent resistance to outside moisture, especially on vertical surfaces, and no enhancement/gloss/color change to the current surface. The mortar really should cure for the better part of a month though IMO.
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Old 07-26-2011, 07:43 AM   #8
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dark block lines after parging


Known in the trade here as 'Grinning'. Usually caused by different strength mortars having different suctions and the coats being too thin. Always looks worse as the wall gets damper. Only real answer that I know is another coat on top with an added waterproofer. 2 coats in a day possibly meant he used thin coats.
As Joe said though, give it chance to cure.

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