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Old 04-02-2010, 05:19 PM   #1
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hiding butt joints - need help

I applied the mud on my butt joints and they are nice and smooth. But as always, there is a hump, the joints are about 8" wide now. I tried to hide it by putting compound on either side of the joint but when I drew my 8" knife, one end of the knife was at the peak of the hump and the other end was on the drywall, I could see a gap, I ended up removing all the mud. First I though it was the angle of my knife, about 45 degrees, but I noticed when I drew my knife slowly, the middle part bent/flexed and scraped the mud, the mud that I wanted to stay to fill the gap. I tried changing the angle to 90 but that caused washboard look. What am I doing wrong? Any tips?



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Old 04-02-2010, 07:57 PM   #2
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first thing is get a 12" good quality drywall knife, then just do one side of the seam and let dry then do the other side after it drys. you should finish up with a butt joint well over 24" wide so thar you are feathered out from the center line. with some gentle sanding and touch up your hump will feather out and be a thing of the past


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Old 04-02-2010, 08:23 PM   #3
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now you see why a pro does not place butt joints on a stud. you use a tapered backer board which pulls the ends in and allows for a joint with no bulges.
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Old 04-02-2010, 09:02 PM   #4
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Bob hit the nail on the head: http://www.taunton.com/finehomebuild...tt-joints.aspx

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Old 04-08-2010, 12:55 PM   #5
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"Best" quality usually means some type of butt joint tool or product. Standard is just to feather it out the 24 inches like in the first response.
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Old 04-08-2010, 06:53 PM   #6
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Products such as the "butt backer" isn't that commonly used. I've got "samples" sitting around I haven't used, but intend to some day. They cost several dollars apiece as I recall, so wouldn't be used by many pros in a whole house situation. Maybe a basement. They are a good concept....
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Old 05-18-2010, 11:19 AM   #7
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a 12" quality knife is a good too to use because it helps you feather out the joint compound smoothly.

You'll have to do it in several coats. You can also use the 12" knife as a straight edge as you sand down the joint compound after it dries. Take a shop light and hold it up to the side of the wall to reveal the imperfections as you sand it down.

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Old 05-18-2010, 11:44 AM   #8
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It is even better to use the light when you APPLY the mud so you can see the problems you are creating that you will have to sand later.
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Old 05-27-2010, 06:38 PM   #9
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Use a curved trowel not a knife. Cover either side from the centre then use your 12" knife later to smooth out. Sounds like to much mud under the tape


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