Not only that, but the head (the cross-end) of the square fits neatly over the edge of the drywall and is long enough that you can be assured that the square is perfectly in place. The T-square is by far your largest investment in DIY drywalling, but there is no acceptable substitute. Your consolation here is that the drywall T-square can be used for things other than drywalling. Some drywall T-squares, such as those manufactured by Empire, have a head that adjusts to 30, 45, 60, and 75 degrees. While not crucial to have an adjustable cross-bar, it sure is nice. The 6-inch knife and the 4-inch knife are used for slopping the mud into place and for taping. The 12-inch knife is used for feathering and final coats. You will need either the 4- or 6-inch (they are fairly interchangeable) and the 12-inch knife. For all other types of drywall work, an ordinary, off-the-shelf 12V or 18V cordless drill will work. The 12V cordless can do the trick; if you want more power, then the 18V drill can easily draw screws into wood studs hundreds of times over. It is also nice to have a clutch on the cordless drill so that the bit will stop turning at a certain point, rather than stripping the screw head. Corded drills will cause you frustration if trying to use them for drywall projects for two reasons: the cord and the difficulty of controlling torque on the drill. The sanding sheets come in two types, both of which you will need: coarse fiberglass mesh with open holes, and sheets that look just like ordinary sandpaper. The fiberglass mesh allows the drywall dust to pass through so that you do not cake up the sanding surface. The sandpaper type of sheet is necessary for finer sanding. It takes much longer for the drywall dust to cake on this fine surface, and it is possible to clean it with a whisk broom occasionally. The other type of sanding sponge is, literally, a sponge. It has no coarse surface. It is a large sponge that is specific for dry-walling purposes and is used for wet sanding. One basic type of non-abrasive sponge is the Goldblatt Drywall Sanding Sponge. It has a smooth side and a slightly coarser side. Drywall screws come in either coarse-thread or fine-thread varieties. Coarse-thread screws draw effortlessly into the wood and are so useful that you will find yourself using them for other home improvement projects. The 1 5/8-inch screw tends to be the most practical length for all drywall projects, though 1 1/4-inch screws are most commonly used with 1/2-inch drywall. Fine thread screws are used for metal framing, whereas coarse threads are used for wood studs. A jab saw is a hand saw with a six-inch blade (depending on the model), sharpened tip, and coarse teeth. It works almost like a “knife with teeth,” a very tough and sturdy form of a serrated kitchen knife. The tip is sharp enough to penetrate drywall, but not so sharp that it will cut your finger when you apply light pressure. The “jabbing” function is the main feature of the jab saw. When you don’t have an edge to start your cut, you must place the sharpened end of the saw perpendicular to the cutting surface and smack the handle with the heel of your free hand. A strike with a hammer or rubber mallet will also do. Jab saws are best for short straight cuts and almost any rounded cut, such as squares for electrical boxes and circles for recessed lights.
