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Help Please! Outside corner bead drywall problem

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Help Please! Outside corner bead drywall problem Loboy48 10-08-2006
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Posted by Loboy48 on October 8, 2006, 8:12 pm


I have a 45 deg wall in my master bedroom. It is the only open wall in
the room. For about 1 year now I have had a problem with a black
streak that starts developing at the top of the base board and
gradually working up the corner bead for about 18 inches and then
stops. The black streak is the width of a pencil lead, and gradually
turns very black, and is only on the sharp corner, It is almost a
perfect line about 1/8" wide. 409 spray cleaner or a bleach water mix
will remove the mark. It comes back in about 4 weeks. The fix I tried
was cleaning the black off, sanding the corner 1/2" to either side of
the sharp corners, treating with bleach, appling 3 coats of kilz
allowing 24hrs between coats, and then painting to match the room with
new porter paint. 4 weeks later it was back. I cleaned it and sanded
the paint off down to the kilz. There was no sign off the black on top
of the kilz. It is standard drywall construction. I had it tested with
a moisture probe and there is no sign of moisture in the wall or on
the other side which is a walk in closet. I did the bleach, kilz, and
top coat fix twice. Did not work the second time either. Any ideas
what this black mark is? Also, other than taking the base boards and
corner bead out and redoing the whole joint any ideas on a fix or what
may be the cause of this? Thanks in advance for any suggestions.


Posted by Paul Franklin on October 8, 2006, 8:52 pm



>I have a 45 deg wall in my master bedroom. It is the only open wall in
>the room. For about 1 year now I have had a problem with a black
>streak that starts developing at the top of the base board and
>gradually working up the corner bead for about 18 inches and then
>stops. The black streak is the width of a pencil lead, and gradually
>turns very black, and is only on the sharp corner, It is almost a
>perfect line about 1/8" wide. 409 spray cleaner or a bleach water mix
>will remove the mark. It comes back in about 4 weeks. The fix I tried
>was cleaning the black off, sanding the corner 1/2" to either side of
>the sharp corners, treating with bleach, appling 3 coats of kilz
>allowing 24hrs between coats, and then painting to match the room with
>new porter paint. 4 weeks later it was back. I cleaned it and sanded
>the paint off down to the kilz. There was no sign off the black on top
>of the kilz. It is standard drywall construction. I had it tested with
>a moisture probe and there is no sign of moisture in the wall or on
>the other side which is a walk in closet. I did the bleach, kilz, and
>top coat fix twice. Did not work the second time either. Any ideas
>what this black mark is? Also, other than taking the base boards and
>corner bead out and redoing the whole joint any ideas on a fix or what
>may be the cause of this? Thanks in advance for any suggestions.

Do you perchance have an 18" high dog that rubs against the corner?
How about a central vac hose that gets dragged around it?

If it's not coming from inside, it has to be a deposit of some type.

Is there an air register nearby that blows on it? What's below the
floor? Any chance of an air leak behind that corner that causes the
corner bead to be cooler than the rest of the wall? This can cause
deposits to build.

HTH,

Paul


Posted by Loboy48 on October 8, 2006, 9:09 pm


On Sun, 08 Oct 2006 20:52:02 -0400, Paul Franklin

>
>>I have a 45 deg wall in my master bedroom. It is the only open wall in
>>the room. For about 1 year now I have had a problem with a black
>>streak that starts developing at the top of the base board and
>>gradually working up the corner bead for about 18 inches and then
>>stops. The black streak is the width of a pencil lead, and gradually
>>turns very black, and is only on the sharp corner, It is almost a
>>perfect line about 1/8" wide. 409 spray cleaner or a bleach water mix
>>will remove the mark. It comes back in about 4 weeks. The fix I tried
>>was cleaning the black off, sanding the corner 1/2" to either side of
>>the sharp corners, treating with bleach, appling 3 coats of kilz
>>allowing 24hrs between coats, and then painting to match the room with
>>new porter paint. 4 weeks later it was back. I cleaned it and sanded
>>the paint off down to the kilz. There was no sign off the black on top
>>of the kilz. It is standard drywall construction. I had it tested with
>>a moisture probe and there is no sign of moisture in the wall or on
>>the other side which is a walk in closet. I did the bleach, kilz, and
>>top coat fix twice. Did not work the second time either. Any ideas
>>what this black mark is? Also, other than taking the base boards and
>>corner bead out and redoing the whole joint any ideas on a fix or what
>>may be the cause of this? Thanks in advance for any suggestions.
>
>Do you perchance have an 18" high dog that rubs against the corner?
>How about a central vac hose that gets dragged around it?
>
>If it's not coming from inside, it has to be a deposit of some type.
>
>Is there an air register nearby that blows on it? What's below the
>floor? Any chance of an air leak behind that corner that causes the
>corner bead to be cooler than the rest of the wall? This can cause
>deposits to build.
>
>HTH,
>
>Paul
No animals, no vac hoses or cords. Have been meticulous in making sure
nothing from a outside source is causing this. It is masonary block
construction with a 4" concrete floor. AC vent is 7ft away on an
opposite wall. I think it is the corner bead causing a bleed thru or
something. It does not appear to be mold or mildew, however, I am not
certain of that. Also, it is a perfect straight line on the leading
edge of the corner bead.

Posted by buffalobill on October 9, 2006, 6:05 am


is there a humidifier or ionic machine in the room?
install some decorative trim or a shelf?
if the kilz is the original formula it sounds like a good job. if the
kilz 2 latex base is used could it be rusting an iron substitute corner
bead?
radio shack has an electronic temp/humidity indicator to see what the
room humidity is.
in the absence of a perfect vapor barrier and insulation, moisture can
travel thru your described building materials.

Loboy48 wrote:
> On Sun, 08 Oct 2006 20:52:02 -0400, Paul Franklin
>
> >
> >>I have a 45 deg wall in my master bedroom. It is the only open wall in
> >>the room. For about 1 year now I have had a problem with a black
> >>streak that starts developing at the top of the base board and
> >>gradually working up the corner bead for about 18 inches and then
> >>stops. The black streak is the width of a pencil lead, and gradually
> >>turns very black, and is only on the sharp corner, It is almost a
> >>perfect line about 1/8" wide. 409 spray cleaner or a bleach water mix
> >>will remove the mark. It comes back in about 4 weeks. The fix I tried
> >>was cleaning the black off, sanding the corner 1/2" to either side of
> >>the sharp corners, treating with bleach, appling 3 coats of kilz
> >>allowing 24hrs between coats, and then painting to match the room with
> >>new porter paint. 4 weeks later it was back. I cleaned it and sanded
> >>the paint off down to the kilz. There was no sign off the black on top
> >>of the kilz. It is standard drywall construction. I had it tested with
> >>a moisture probe and there is no sign of moisture in the wall or on
> >>the other side which is a walk in closet. I did the bleach, kilz, and
> >>top coat fix twice. Did not work the second time either. Any ideas
> >>what this black mark is? Also, other than taking the base boards and
> >>corner bead out and redoing the whole joint any ideas on a fix or what
> >>may be the cause of this? Thanks in advance for any suggestions.
> >
> >Do you perchance have an 18" high dog that rubs against the corner?
> >How about a central vac hose that gets dragged around it?
> >
> >If it's not coming from inside, it has to be a deposit of some type.
> >
> >Is there an air register nearby that blows on it? What's below the
> >floor? Any chance of an air leak behind that corner that causes the
> >corner bead to be cooler than the rest of the wall? This can cause
> >deposits to build.
> >
> >HTH,
> >
> >Paul
> No animals, no vac hoses or cords. Have been meticulous in making sure
> nothing from a outside source is causing this. It is masonary block
> construction with a 4" concrete floor. AC vent is 7ft away on an
> opposite wall. I think it is the corner bead causing a bleed thru or
> something. It does not appear to be mold or mildew, however, I am not
> certain of that. Also, it is a perfect straight line on the leading
> edge of the corner bead.


Posted by Goedjn on October 9, 2006, 12:00 pm



>On Sun, 08 Oct 2006 20:52:02 -0400, Paul Franklin
>
>>
>>>I have a 45 deg wall in my master bedroom. It is the only open wall in
>>>the room. For about 1 year now I have had a problem with a black
>>>streak that starts developing at the top of the base board and
>>>gradually working up the corner bead for about 18 inches and then
>>>stops. The black streak is the width of a pencil lead, and gradually
>>>turns very black, and is only on the sharp corner, It is almost a
>>>perfect line about 1/8" wide. 409 spray cleaner or a bleach water mix
>>>will remove the mark. It comes back in about 4 weeks. The fix I tried
>>>was cleaning the black off, sanding the corner 1/2" to either side of
>>>the sharp corners, treating with bleach, appling 3 coats of kilz
>>>allowing 24hrs between coats, and then painting to match the room with
>>>new porter paint. 4 weeks later it was back. I cleaned it and sanded
>>>the paint off down to the kilz. There was no sign off the black on top
>>>of the kilz. It is standard drywall construction. I had it tested with
>>>a moisture probe and there is no sign of moisture in the wall or on
>>>the other side which is a walk in closet. I did the bleach, kilz, and
>>>top coat fix twice. Did not work the second time either. Any ideas
>>>what this black mark is? Also, other than taking the base boards and
>>>corner bead out and redoing the whole joint any ideas on a fix or what
>>>may be the cause of this? Thanks in advance for any suggestions.
>>

If it's a perfect line and never gets more than 1/8" wide,
it's almost got to be something behind the drywall telegraphing
through. (A metal corner bit thats one or all of cold, magnetic,
or got an electric charge on it, attracting dirt.)
Put some tape there and see if the black stuff is on
the room side or the wall side.

Sounds like a good place for some 1/4 round molding, if you
ask me, although I might be tempted to drill into the corner
to see what's there, first.

--Goedjn



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