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Old 01-19-2018, 11:04 AM   #1
wopachop
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Why is this grout black along the corners only?

Hello everyone learned a ton from this forum over the years. Im stumped on what is causing grout to turn black. At first i thought the weep holes were plugged, and water under the tiles is darkening the grout.

Then i thought its just mildew and needs to be cleaned.

I cleaned with Miracle Heavy Duty acid cleaner. Not a single spec of black color comes off. The scrub pad i used did not pick up any black color either.

When i get the grout wet, it does not change color.

Why is the black color just along the corner edge? Shower is located in southern california where hot mop shower pans are popular. Can it be tar related? Black magic maybe? Mildew under a layer of grout sealer?

Thanks for any advice on the cause and the correct repair.
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Old 01-19-2018, 11:08 AM   #2
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Tony,

Your shower pan is holding more water than it should, not letting it dry as normal.

1- Do you have any idea if the hot mop was sloped towards the drain?

2- Do you have any idea if there is pea gravel (or similar) around the drain?

3- I'd be looking at removing the shower floor and having it properly re-set with the right drypack mixture, gravel around the drain, and caulking at the changes of plane.

4- Is the curb showing any signs of puffing? expansion? cracked joints & tiles not aligned?
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Old 01-19-2018, 11:29 AM   #3
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Unfortunately we know nothing about the construction of the shower. Can i pop off the shower drain cover and possibly get some clues?

I can look closer at the curb next time over there. While trying to clean i did not discover any cracks in the grout, or any tiles that appear to be coming loose.

If its water under the tiles then why is the black color only along the edges? Wouldnt the entire floor show signs of dark grout or mildew?
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Old 01-19-2018, 12:05 PM   #4
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Yes there is water under the tiles, sammiched between the tiles and the vinyl liner is a 2 inch thick layer of drypack. (cement)
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Old Yesterday, 10:30 AM   #5
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So your saying he has 2.5 of pan water that is only affecting the highest part of his floor?
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Old Yesterday, 07:21 PM   #6
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isn't is tar?
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