![]() If the plaster doesn’t pull up and/or the screw doesn’t tighten up, you have likely missed the lath and should back out the screw and move it slightly. Tighten down the drywall screw just enough to pull the sagging plaster up against the lath and flatten out the convex washer. Drive the screw through the plaster and into the wood lath a couple of inches back from the edge of the hole or crack to be repaired. Next, insert a galvanized drywall screw (1 5/8 to 2 inches) through the center hole of the plaster washer and place the screw head into a #2 bit on a screw gun. Use a vacuum with an upholstery attachment along with an old paintbrush to remove dust and surface debris. Slightly undercut the edges of the existing plaster to create a solid bond with the new plaster. First, using a chisel or putty knife, remove any loose or crumbling plaster in the area that you need to repair. Here’s how to take the sag out of your plaster ceiling using these nifty little gadgets. The disc also has many smaller holes scattered throughout into which spackle or drywall joint compound attaches itself to conceal the repair. The disc has a countersunk hole in the center through which you insert a drywall screw. Many years ago, we learned of a little-known plaster repair device called a plaster washer - a round metal disc about an inch in diameter used to hold up a sagging ceiling. ![]() Always step only on ceiling joists and structural framing members when navigating attic spaces to avoid falling through the ceiling. An adult’s body weight alone can exceed that. ![]() The average load-bearing capacity of wood lath plaster ceilings is around 50 pounds per square foot. The effects of stepping on unstable lathing when in the attic space above a plaster ceiling can be sudden and destructive. Such was the case in the classic holiday movie “National Lampoon’s Christmas Vacation” when a bumbling and unsuspecting Chevy Chase crashed through the ceiling onto a bunk bed below. Often, it happens when someone missteps in the attic - setting foot on the lath rather than on the ceiling joists. However, a broken key isn’t always the cause of a sagging ceiling. This occurs when the key breaks and the connection to the lath is lost. One of the most common problems with plaster is sagging ceilings. A plaster finish is infinitely more difficult to patch than drywall. Anyone with plaster can tell you how it cracks, and just try hanging a picture in plaster. Like anything else, plaster has its drawbacks, price aside. Drywall is cheaper to produce and install. The obvious question is why isn’t it used as it once was. It’s strong, has a uniform look, and can last forever. ![]() The key prevents the applied plaster from pulling away from the lath, and ample fastening prevents the lath from pulling away from the framing. The excess plaster that dries behind and around the lath is referred to as the key - essentially locking the plaster to the lath. ![]() Portland cement plaster was painstakingly hand-troweled onto wood slats (lathing) nailed to the wall and ceiling framing. Lighted Magnifying Glass That Stays Putīefore the advent of prefabricated wallboard (drywall) in the 1940s, plaster was the material of choice for interior walls and ceilings in American homes.Best Lawn Care Service for Service Dogs. ![]()
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