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  1. #1
    Join Date
    Aug 2007
    Posts
    6,940

    Default Interesting Problem

    I have an interesting problem that I've never encountered before in all my years in the trades.

    I live in a manufactured home (don't get me started! ). In the master bathroom there are 8 to 10 spots in the walls and ceiling that look like rust pitting through the paint, much like you'd see at corners with metal corner bead. Here's the kicker, it starts as a pin hole with the "rust" developing around the hole, then it sort of migrates away from the hole sort of like what a termite tube looks like. These are areas with no metal corner bead, they're random in nature, though concentrated over the corner shower and around one window.

    I will try to take some pics soon to share, maybe that will help. These are the strangest thing. I suspect that it may be ants, but I've never seen an ant burrow through drywall, much less multiple places. The affected area is the ceiling over the 3/3 shower and around a window that is 16x20. Southwest corner of the house, for what it's worth.

    I really don't want to do any exploratory surgery to figure this one out, but that is probably the only way to know what this weirdness is.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  2. #2
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    994

    Default Re: Interesting Problem

    here's my guess. the drywall screws are forming condensation and rusting. the lines you see in the ceiling are the rusty water weeping from the screws. just dig out a small part of the ceiling where one of the marks are and see if there's a screw there.

  3. #3
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,917

    Default Re: Interesting Problem

    Or paint over them.

  4. #4
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,314

    Default Re: Interesting Problem

    Spruce, do you have metal studs by any chance? if not, it's most likely the drywall fasteners (screws or nails) as MLS indicated.
    You could sand, prime and paint over it as HR said.

    OR, replace the fasteners and use rustproof ones...

  5. #5
    Join Date
    Aug 2007
    Posts
    6,940

    Default Re: Interesting Problem

    It's not my bathroom, so I haven't worried about it.

    The spots are random and not associated with fasteners from what I can see. She had burned a smoldering candle in there, which smoked the walls and pinpointed most of the fasteners, is how I know this.

    You know the sand like grains (poo ) that ants and termites leave behind, the stuff is very similar to this and there is a pin hole from which this stuff both accumulates around and drops from.

    I just Googled "ant damaged drywall" and came up with this pic, which is very similar to what I've got going on.

    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  6. #6
    Join Date
    Aug 2007
    Location
    Maryland
    Posts
    1,520

    Default Re: Interesting Problem

    If only the drywall was installed and finished with caulk, you probably wouldn't have any problem.

  7. #7
    Join Date
    Aug 2007
    Posts
    6,940

    Default Re: Interesting Problem

    Quote Originally Posted by ed21 View Post
    If only the drywall was installed and finished with caulk, you probably wouldn't have any problem.
    You're right, it's definitely a lack of staples! LOL
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  8. #8
    Join Date
    Dec 2012
    Location
    New London County, CT
    Posts
    117

    Default Re: Interesting Problem

    I agree with the rusting screws. We have a summer camp trailer that I have made repairs to and the same thing happens. A few months after painting the rust is starting to bleed through where I used plated screws.

  9. #9
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,314

    Default Re: Interesting Problem

    Spruce,

    This is bad news. Try orange oil termite treatment without toxic chemicals.

  10. #10
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,917

    Default Re: Interesting Problem

    Termites hate dry sand. Pour a bag or two of course dry sand around each pier. When they go to make tubes, the tubes collapse and the termite union rep files a grievance. They go on strike and picket until the sand is removed.

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