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Old 07-08-2013, 10:38 AM   #1
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Basement Drywall Deteriorating Help


I remodeled a basement about a year ago. I used insulation R-19 and I think 1/2 inch drywall. This year there has been a lot of rain (no flooding in basement). I have two spots on the drywall where it looks like humidity got into the sheet rock and turned it soft and breaks easy with the touch. I did not see signs of water or leaking so I'm assuming is the humidity in the area. One spot is near the door entrance, the other is in a closet near a window. The closet area has black mold starting to grow on it. I talked with a guy that had the same problem and he said to use the cement board instead of drywall and I won't have the problem. Thoughts and suggestions? Would a dehumidifier work or more ventilation?

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Old 07-08-2013, 10:44 AM   #2
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Basement Drywall Deteriorating Help


Sounds like the window and door are leaking.
Got some pictures of the outside where the window and door are?
No close ups needed.

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Old 07-08-2013, 11:29 AM   #3
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Basement Drywall Deteriorating Help


I agree, if you're seeing this type of damage in only one year there's a leak somewhere. Possibly in more than one location.
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Old 07-08-2013, 01:27 PM   #4
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Basement Drywall Deteriorating Help


There was a huge scandal about drywall sheets made in China outgassing some unknown substance that was corroding copper pipes and stuff, don't know if it could be related to that- getting old stock that was in a warehouse affected by that, but the effect of the chemical was pretty dramatic as I remember.
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Old 07-09-2013, 12:06 PM   #5
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Basement Drywall Deteriorating Help


This is the wall in the closet. The other wall near the entrance door had the same symptoms, but when I removed the drywall there were no pipes leaking on the wall, also the door is not an exterior door so no water from the outside could get on it. Ironically the room next to the exterior door is a laundry room and the drywall is intact. Right now my theory is that the basement area is air conditioned and the laundry room is not. So the condensation in the air is condensing on the wall, much like a glass of water on a hot summer day. I'm going to remove the drywall in the closet this weekend. There might be pipes leaking behind it but the ceiling is not damaged. Any suggestions, diagnostics or tips are appreciated. Thanks.
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Old 07-09-2013, 12:11 PM   #6
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Basement Drywall Deteriorating Help


I attached a photo and some feedback on the comment. The entrance door drywall i removed and no leaking pipes and not exposed to exterior so don't think its coming from leaking water. The closet might be a different story. What do you think about using cement board instead of traditional drywall?
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Old 07-09-2013, 12:12 PM   #7
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Basement Drywall Deteriorating Help


I attached a photo and some feedback on the comment. The entrance door drywall i removed and no leaking pipes and not exposed to exterior so don't think its coming from leaking water. The closet might be a different story. What do you think about using cement board instead of traditional drywall?
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Old 07-09-2013, 08:22 PM   #8
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Basement Drywall Deteriorating Help


If that damage was caused by condensation it would be everywhere. So would the mold, water is getting in some where. How do you plan to finish cement board?
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Old 07-09-2013, 09:33 PM   #9
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Basement Drywall Deteriorating Help


I had a basement wall look like that once and found it was caused by the upstairs toilet flooding over. Do you have a bathroom or kitchen above that wall? It may be coming from upstairs.
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Old 07-12-2013, 01:36 PM   #10
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Basement Drywall Deteriorating Help


You obviously have a moisture problem. Changing to cement board will not solve the moisture issue. The cement board won't deteriorate like regular drywall, but the mold will then form on the organics in the finish. You need to identify and cure the moisture issues first. Then patch in the drywall with mold/moisture resistant drywall (Densarmor or MMR board).
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Old 07-22-2013, 12:04 PM   #11
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For anyone wondering what happened. I took off the drywall and found a leaking pipe. Repaired the leak and put up new drywall. Everything is going fine so far.

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