The walls and ceilings in most modern homes are covered in drywall or sheetrock for a strong, smooth surface that can be painted or covered in your favorite wallpaper. The trick is to hang the large sheets of drywall on the ceiling or wall and then blend the sheet together with drywall mud or joint compound. It takes a little practice but if you take your time and work slowly, you can get a nearly perfect seam that will be nearly undetectable.
Hanging the Drywall
When using drywall you have to select the size sheets you will need for the room. Most commonly, drywall is 4 feet by 8 feet but you can get 12 foot long sheets and sometimes even 16 foot sheets, though these are very hard to work with. Try to get sheets of drywall that will cover as much area as possible while minimizing the cutting of sheets. The sheets are hung with drywall screws and placed side-by-side until the service is covered.
Pay Attention to the Bevel
When the sheets are placed on the wall or ceiling, try and line up the beveled edge of the drywall sheets so they meet each other. You can clearly see the beveled edge on the sheets and if they are lined up properly, they will create a low spot that is perfect for adding drywall mud and tape to create that seamless joint.
Applying Drywall Mud To The Wall
When it is time to start creating those joints, you want to start with a wide putty knife and carefully spread a thin layer of drywall mud or joint compound along the seam. The idea here is to fill in the gap where the sheets meet and leave a thin layer in the drywall on either side of the gap. Add some joint tape over the seam and use your putty knife to press it into the mud that is on the wall. The smoother it is, the better the seam will look. Let this joint dry overnight before doing anything more to it.
Applying Additional Coats to the Seam
After the mud has dried, run a wet sponge over the high spots to knock them down. Using a very wide trowel cover the tape and joint in mud so it is level with the surface of the drywall. The idea is to fill that beveled area so that the seam is completely blended into the way. Apply the mud in thin coats, letting each coat dry before you add another. Be sure to sand or sponge out imperfections between coats so your finished coats looks smooth and clean. Sometimes building the joint a little higher and then sanding it smooth is easier to do and if this is your first drywall project, that might be the best option. Remember that this is not a simple process but if you take your time and work in thin coats you can get it done. If you are not comfortable doing it, hiring a sheetrock or drywall contractor like Rio Grande Drywall Supply Co to do the job for you.