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Old 12-26-2016, 08:45 AM   #1
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Metal at corners


First, I have to say, even tho I know this it still amazes me. After many days of dreary prep and trim painting rolling the walls goes so fast and is such a pleasure.

Removing wallpaper I noticed several spots on corners where the thick compound on the metal at corners is loose. On one place it broke off. On other places its loose but attached.

I planned to put new joint compound, in layers, on the big area. Not sure about the narrow area.

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Last edited by Startingover; 12-26-2016 at 08:50 AM.
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Old 12-26-2016, 08:48 AM   #2
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Re: Metal at corners


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Old 12-26-2016, 09:26 AM   #3
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Re: Metal at corners


Can be caused from several different things.
Most common one I've found would be not enough drywall nails used to attach it.
I'd tap with a hammer, (staying away from the the very outside corner) to break off all the old loose compound.
Add more nails.
Then refinish with new compound, making sure to use thin coats.
Use the raised metal edge as your guide, there is no need to try and cover it up with compound.
Everyone does this different, but when just doing a repair like that I do my first coat with a 4" knife, then switch to at least an 8" for the next two coats. The wider the knife the better so you do not end up with a hump in the corner.
The pros would use hot mud for at least the first coat so it will dry faster.
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Old 12-26-2016, 10:48 AM   #4
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Re: Metal at corners


I would just do a 20 minute hot mud to patch it. Most likely due to wood movement in the wall, or settling. Fill it, smooth it, and move. On...

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Old 12-26-2016, 11:11 AM   #5
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Re: Metal at corners


What Joe said. A lot of drywallers just CRIMP the corner bead on and don't even use nails or screws so it moves a lot especially if someone dings a corner, etc. Instead of nails, I would likely use drywall screws just because it might be easier and you won't jar other portions of the corner bead loose when pounding in the nails. Then, as Al said, mix up some powdered "hot mud" and apply it. Let it dry. Then knock off any ridges and apply a regular coat of joint compound. Allow to dry for 24 hours, sand, remove dust, prime, and repaint.
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Old 12-26-2016, 12:10 PM   #6
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Re: Metal at corners


Screws beat nails 100 times out of 10. You might want to use a knife to cut that away instead of hitting it with a hammer and doing more damage.
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Old 12-26-2016, 12:55 PM   #7
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Re: Metal at corners


What Joe said.

I've not found screws to be better for corner bead. It is almost impossible to sink them enough to finish properly.
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Old 12-26-2016, 05:06 PM   #8
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Re: Metal at corners


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What Joe said.

I've not found screws to be better for corner bead. It is almost impossible to sink them enough to finish properly.
Exactly. I've been using ring shanked drywall nails for 40 years on cornerbead and never had an issue. I use screws elsewhere, but this is one of the few instances where I ring the right nails to be better.
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Old 12-26-2016, 05:16 PM   #9
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Re: Metal at corners


Screws will wrinkle the metal, you will find as you try to smooth out the mud the knife will keep hitting the heads of the screws.
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Old 12-27-2016, 12:17 AM   #10
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Re: Metal at corners


I don't know a thing about 'hot mud'.

I'll have to decide. I know a good drywaller. Maybe this is too small of a job for him to bother with. I could try and if I don't like my results then call the drywaller. This corner is on the main entrance to the kitchen.

I'm more comfortable doing repairs in my own house, but in my daughter's house I worry.
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Old 12-27-2016, 04:04 AM   #11
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Re: Metal at corners


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Originally Posted by Startingover View Post
I don't know a thing about 'hot mud'.

I'll have to decide. I know a good drywaller. Maybe this is too small of a job for him to bother with. I could try and if I don't like my results then call the drywaller. This corner is on the main entrance to the kitchen.

I'm more comfortable doing repairs in my own house, but in my daughter's house I worry.
I don't think you could possible make it worse, nail (screw)it down, slap some mud on it, sand it, paint it. As they say, it's not rocket science.
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Old 12-27-2016, 08:06 AM   #12
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Re: Metal at corners


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Originally Posted by joecaption View Post
Screws will wrinkle the metal, you will find as you try to smooth out the mud the knife will keep hitting the heads of the screws.

If you use a drywall drill bit that isn't an issue unless you try to sink it like a race car. Besides, properly put in, the knife will plane over the screws. To each their own, though.
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Old 12-27-2016, 10:42 AM   #13
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Re: Metal at corners


Quote:
Originally Posted by Startingover View Post
I don't know a thing about 'hot mud'.

I'll have to decide. I know a good drywaller. Maybe this is too small of a job for him to bother with. I could try and if I don't like my results then call the drywaller. This corner is on the main entrance to the kitchen.

I'm more comfortable doing repairs in my own house, but in my daughter's house I worry.
Hot mud is just a powder that you mix with water when you are ready to use it. It dries very quickly due to chemical reaction with the water. It comes in various weights (20,45,90) that equal the amount of time you have to work with it before it starts to set. Mixing with hot water will hasten the process, cold water will extend it slightly.
Once mixed, you just put it on like regular compound, but you can do multiple coats in a day because it dries so quickly.

Use ring shank nails to reset the corner bead, clean out any loose compound, mix up some 45 minute compound, and float it onto the corner bead with a 4 inch knife. Once dry (in about an hour), mix up some more compound and apply a second coat with an 8 inch or 10 inch knife.

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Last edited by Al_Amantea; 12-27-2016 at 10:45 AM.
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