Hillman Group 41994, 25-Pack Zinc-Plated Plaster Washers, 25 Pieces
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The washers will prevent the screw pulling right through the plaster and can be sunk a fraction into the surface. I make my own plaster washers using a section of plumber strapping (metal strapping perforated with holes for fasteners). My cracks ran across the entire ceiling from wall to opposite wall in several places so it was more than a patch or quick fix.
With plaster washers and wide fiberglass mesh, old plaster walls can be made smooth and solid again.One can also use a stainless pan head/small washer to over-tighten sheet into the die, which avoids carbon steel transfer to the stainless, probably an over-analysis. Small areas can be repaired but larger areas are best cut out and replaced with plasterboard and then skimmed with finish plaster.
Save yourself time and trouble — make the patch a square or rectangle, even though the hole may be a different shape. If the sagging is severe, meaning that it's hanging an inch or more away from the lath base, or if it covers a large portion of the ceiling, your best bet is to remove the old plaster and replaster the ceiling, or cover it with wallboard.We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Place a large enough sheet of ply or similar material over the bulging area and wedge it back up with a sturdy length of timber from the floor below.
A plaster washer is a thin metal disk that increases the size of the head of a drywall screw so that it doesn't pull through the plaster. To avoid cracking the plaster and creating an even bigger repair job, don't pull the plaster tight to the lath in a single motion. I do appreciate the video however because you do preface it with "in a pinch", even though it's not a better way.And if you’re new to patching plaster, and have never seen this method, simply learning about the concept is useful. To reattach the sagging plaster to the lath, drive the washer with a power screwdriver or drill so that it penetrates the wood lath, wall studs, or ceiling joists.