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A. Spruce
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.

MLB Construction
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.

HoustonRemodeler
Re: Interesting Problem

Or paint over them.

dj1
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...:eek:

A. Spruce
Re: Interesting Problem

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

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.

ed21
Re: Interesting Problem

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

A. Spruce
Re: Interesting Problem
ed21 wrote:

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 :D

Condoman
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.

jkirk
Re: Interesting Problem

ive seen the rusting screws thing quite a few times on older homes that have poor ventilation in the bathroom. and or not enough insulation in the attic.. condensation forming on the nails up in the attic space and its bleeding down through

HoustonRemodeler
Re: Interesting Problem

Do the dirt grains taste salty or rusty? Tell Mrs Spruce this is a critical test and we need her discriminating pallet.

A. Spruce
Re: Interesting Problem
HoustonRemodeler wrote:

Do the dirt grains taste salty or rusty? Tell Mrs Spruce this is a critical test and we need her discriminating pallet.

:eek: A sample is in the mail to you as we speak! :D

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