How Much to Sheetrock a 16-by-20 Attic?

About Sheetrock

• Sheetrock is a brand name for drywall, or wallboard, which is made from a gypsum core and covered with rough paper on the rear side and smooth paper on the front. Although Sheetrock is available in both 4-by-8-foot and 4-by-12-foot sheets, the smaller pieces are easier for do-it-yourselfers to handle, and they're easier to install in tight spaces. Sheetrock also comes in different thicknesses. Use 1/2 inch if your attic has 16-inch framing; use 5/8 inch Sheetrock if your attic has 24-inch framing.

Materials You Need

• In addition to Sheetrock, you need drywall screws or shank nails to fasten the Sheetrock to the walls and ceiling. Metal corner strips that protect the outside corners are a necessity, as are small nails that fasten the strips to the drywall. Finally, purchase joint tape and joint compound to join and smooth the joints between sheets of drywall.

Estimating Material Quantities

• Use an online drywall calculator to estimate the amount of Sheetrock, drywall compound, drywall screws or nails, and joint tape you need for your attic. Although the basic formula for a room with a ceiling height of 8 feet or less is to use one sheet for each 4 feet of the room's perimeter measurement, if your attic has a peaked ceiling or knee walls, that formula may not be accurate. An online calculator tailors the estimate to the precise dimensions of your room. Measure the length and height of each wall, plus the length and width of the ceiling. Also measure the height and width of each window and door. You then enter these figures into the calculator.

Tools

• Use a tape measure to measure your attic and the Sheetrock. You cut the Sheetrock using a score-and-snap technique that requires a utility knife and a straight edge or T-square. Use a keyhole saw to cut small holes, such as those for electrical outlets. Have a claw-head hammer on hand if you plan to nail the Sheetrock. Otherwise, use a screw gun or drill for drywall screws. If you work alone, build a T brace out of 1-inch-by-4-inch and 2-inch-by-4-inch lumber to hold the Sheetrock up while you fasten it. You also need a trowel and finishing knife to apply the joint compound, plus sandpaper to smooth the compound after it dries.