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February 2007
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Taping Inside Corners

Taping inside corners is not hard if you follow a few simple proceedures. This short tutorial should help you tackle taping projects at your house. This is part of the Bathroom Pocket Door Project, being the wall over the pocket door, to the corner.

Taping is as much art as mechanics. A lot of it has to do with feel, and technique. As you develop the technique, you will be able to feel the mud doing what you want. Don’t worry about speed.

I am using a 6″ drywall knife for this project. This first photo shows my knife with a glob of mud. Notice that I have ‘cut’ the side of the glob. This is to minimize splatters and ‘mud sharks’ from forming as I start my mud lines. I have ‘cut’ the right side of the mud as I will be running the right hand side of the inside corner first. Also note that our mud glob is about 2” wide.

In this photo you see that I am starting at the top of the inside corner, and the cut portion of my mud is facing down. Note that we are using the knife sideways. The wide portion of the knife is parallel with the direction of our run. This is so we apply just enough mud to embed the tape.

This photo shows the knife in action as we do the mud run along the one side of the edge. My forefinger being used as a guide for my application. Hold the knife firmly, (not a death grip, cause your arm will get tired real quick and you will create a mess)
Notice that we are trying to apply a consistent amont of mud for the tape.

This photo shows two mistakes that you want to avoid. First is the narrow mud line. This line is not wide enough to allow you to embed the tape completely. This means that if you wipe down the tape without getting complete coverage between the tape and the mud, creating a void, you will get a bubble, which are harder than hell to fix. Secondly, see the real light area next to the narrow line? This is where the knife side was pressed too hard against the wall as you ran the mud. This will bubble for sure.

Now that you have mudded your corner on both sides, measure and prepare your tape. Drywall tape is pre creased which will allow you to create a smooth sharp corner. The crease is on the inside as you unroll the tape.

It only takes light pressure with thumb and forefinger to crease the tape/

Once you have your tape creased, you gently place it on your mud.

You then use your knife normally to wipe down the tape and mud, one side at a time. Here is where the feel comes in to your project. You need to apply enough pressure to embed the tape,and feather the edge of the mud. It takes a bit of practice, but you can do this.

Here is your corner after wiping down both sides. A quick swipe with your knife will get rid of the little bits of mud you see at the top.

Drywalling Openings and Archways

You have done the demo, installed your framing, and are ready to drywall. Inside corners that are found in archways, hallways and doorways can be improved by the bridging the inside corners. We will use the closet opening that is left over from the Bathroom Pocket Door Project. [1] [2] [3]

Here is the right side of the closet opening. Anytime that you attach new wood to existing framing, the new wood contains more moisture than the existing, and until this equalizes, the wood will move. So will anything attached to it. To minimize defects in your drywall and your finished wall, we will bridge the opening with a piece of drywall. This is to reduce the possibility of cracking and make taping easier.


What we are going to do is install a piece of drywall that is wider than the opening. Here we have a piece of drywall attached to the inside corner, butting the ceiling and the existing wall. Notice that this piece covers the header about a foot and and the trim stud about two feet. The ceiling in my hallway is 7′. You would use a full 4′ sheet on an 8′ wall.

(*Note* when attaching the drywall, keep your fasteners about 4” from the inside corner. If you nail or screw any closer, the wood movement will crack the drywall, making this a futile exercise)
We want the corner to float until we attach the cornerbead.

Once you have your drywall attached, take your keyhole saw and cut along the stud up to the header.

Once you have finished this cut, take your utility knife and score the drywall on the backside along the header line.

Next, tug on the drywall from the face side to get it to break on your score line.

Take your utility knife and score the face paper along the inside corner created by the snapping of the drywall.

Snap the drywall to remove this piece and you are done.
You now have a corner that you will be able to cornerbead without having to tape at the inside corner.