Outside drywall corners can be finished with either metal or paper bead but metal is the easiest to install and by far the best choice for durability and professional results. Drywall sheets usually don't come together perfectly at the corners, a metal bead forms its own corner to cover any irregularity in the union. Paper corner bead can't do that and the finish may appear wavy and irregular when finished.
For a durable finish use setting-type joint compound, also called mud, for the first coat over the metal. Ready-mixed compound can be used for the second and finish coats but it's too soft and prone to shrinking when used in a thick application like that required to cover metal corner bead. Work quickly when using setting compound to be sure it doesn't harden before you're done. Measure the length with a tape measure and cut a piece of bead for each outside corner. Use a pair of tin snips or scissors to cut in from each side of the metal and then bend it in the middle to break it apart.
Hold the bead against the corner while pressing hard on the peak with your palm to flatten it tightly to both walls. Start near the top and drive a 1 5 8 or 2 inch drywall screw through one of the small holes in the metal and into the wall frame.
Drive a screw into the opposite wall at about the same level, but not directly across, to hold the bead in two places. Sink the heads of the screws deep enough to slightly kink the metal and make a small depression in the drywall.
If the screws are not driven far enough below the surface of the wall, the heads will show through the mud and be very visible. Move along the length pressing at each point and driving the screws at about 12 inch intervals along both walls.
If there are any spots of vinyl that do not have glue, they will probably flash or crack after being coated. When ready, the vinyl bead can be placed on the corner. The spray adhesive will attach quickly so you will only have a few seconds to make sure it is installed straight and square. When done properly, spray adhesive is so strong that it cannot be removed from the drywall without ripping the paper.
At times, a compressed air staple gun is also used to give added strength but the spray adhesive is usually good enough on it's own. Metal corner bead can be installed with nails, screws or staples. When working with wood studs, nails or staples are the easiest method. Screws must be used on metal studs.
One challenge with using metal fasteners on metal bead is the tendency for them to push the bead one direction or another. Although metal corner bead has holes in various locations.
You may need to screw directly through the metal on the bead instead of through the pre-punched holes. Drywall tape can also be used, though this is rarely done. However, we have found that metal bead that has been taped on with drywall tape rarely cracks. Paper faced metal corner bead is applied with methods very similar to taping drywall seams. Mud is applied to the drywall. Then the paper on each side of the metal bead is pressed into the mud.
Excess drywall mud is smoothed out from the edges to ensure a uniform adhesion. Once dry, it can be coated as normal. There are specialized tools to aid in installing paper faced metal corner bead. Corner bead hoppers apply drywall mud to the paper quickly and evenly by simply pulling the bead through the hopper. Step 2: Mud the corner. Step 3: Mist the wall beading. Step 4: Position the drywall paper bead.
Step 5: Embed the tape. Step 6: Use staples to align corners. Step 7: Check the corner with your blade. Do you tape corner bead? Taping the metal corner helps to prevent cracks. If you don't want to go shopping for special corner bead, avoid future cracking by applying paper tape over the metal edge after you've nailed on the bead.
Embed the tape just as you would on any joint. Then fill the corner as usual. How do you tape drywall corners? Use a 6-inch joint knife to fill any gaps between the two walls with drywall compound.
What is J bead? Used to finish drywall edges when dissimilar materials and door and window encasements meet gypsum. Metal is the most traditional type of corner bead. Metal beads come in two shapes: square 90 degrees and bullnose, which has a rounded edge for curved corners. Vinyl corner bead comes in the widest array of shapes, sizes, and styles.
It also has an arch bead option, which has little notches on its sides that you can easily bend and shape to fit any trim size. There are several different ways to install vinyl corner bead, but the manufacturer-recommended way is to use a spray adhesive and then staple them to the drywall board. Typically corner bead installation comes after taping, though some drywall finishers like to install corner bead first.
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