Plan ceiling-panel layout so seams are at least 8 inches away from light-fixture boxes.Wires or plumbing pipes closer than 3⁄4 inches to the edge of a stud require a metal shield called a nail plate. Uncover any electrical boxes concealed by insulation. Tuck wires behind receptacles as far as possible into the back of switch boxes and ceiling-fixture boxes. Check that electrical cables are protected from screws or nails.Buy one or two extra per room to cover any cutting mistakes. To estimate the number of 4-by-8-foot sheets needed, calculate the total square footage of walls and ceilings and divide by 32.These, however, are used only to cover existing drywall. That’s why manufacturers have developed 3⁄8-inch thick gypsum panels that weighs 16 percent less than standard sheets. A 12-foot sheet of ½-inch drywall weighs about 80 pounds, nearly 30 pounds more than a standard 8-foot panel. The sheets most commonly available in hardware stores measure 4 by 8 feet, but lengths can reach up to 16 feet and widths up to 54 inches, which speeds the installation and minimizes the number of seams.īigger panels have their downside, however: They’re heavy and unwieldy. Half-inch is the preferred thickness for walls and ceilings 5⁄8-inch works best if studs or joists are 24 inches apart, where thinner drywall would sag. When butted end-to-end, its factory-beveled lengthwise edges form a shallow swale for a topping of joint compound and tape. The light-gray product known as drywall is the type in widest use. It bonds tenaciously with veneer plaster, a finish much in demand in Landry’s area. Massachusetts contractor Paul Landry often installs “blueboard,” so-called because of its indigo paper. “Type X” resists fire, making it well-suited to furnace rooms and between-floor chases. “Greenboard” keeps its integrity in the face of high humidity, making it a good choice for bathrooms. There are 1⁄4-inch-thick flexible panels to cover a curved wall or ceiling and 5⁄8-inch-thick abuse-resistant panels that are less likely to develop holes or dents. Despite their drab, if-you’ve-seen-one-you’ve-seen-them-all appearance, these flat sandwiches of gypsum plaster and recycled newsprint come in a variety of types and sizes to suit the specific demands of a job.
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