Mouldings, however, are run in place, the profile created by pushing a template against wet plaster. Ornaments including ceiling medallions are cast in a mold, then applied. Known variously as plasterboard, gypsum board, Sheetrock a trade name , rock, or wallboard, drywall is a uniform panel of gypsum plaster pressed between thick sheets of paper. In the U. It can be nailed or screwed to wood or metal studs. Once the joints are taped and coated with joint compound, drywall is ready to be painted or wallpapered.
Manufacturers offer drywall for diverse uses and settings: there are fire, moisture, or mold resistant varieties, for example, and rock that serves as a base for tile installation. This makes it easier to tailor drywall with specific characteristics to areas where moisture or mold is a problem. For a bathroom where the original plaster is long gone or compromised by water damage, for instance, greenboard is an excellent choice. Cracks can be caused by foundation settlement, undersized joists, seasonal and humidity changes, and poorly executed repairs.
Cracks can range from hairline-size to very wide. They can follow structural members in a straight line or run diagonally across the wall surface. Patching cracked walls is a skill that falls somewhere between the trades of plastering and drywall finishing. In other words, a willing beginner can make minimal repairs, and with practice, progress to more challenging projects. Allow each layer to dry, then sand lightly before applying the next coat.
Sand the patch smooth with fine-grit sandpaper on a sanding block. Then check to see whether one side of the crack is higher in relief than the other. There may still be some follow-up taping and filling once the product is in place. If the plaster moves, or one side of the crack is visibly higher in relief than the other, dig out the crack on the high or loose side with a utility knife or a crack opener, a small hand tool. Remove enough material to reach sound plaster.
Keep in mind that plaster continues to move over time. Most professional plasterers recommend securing the loose or high side of the crack with plaster washers, wafer-thin perforated discs see below that refasten plaster to lath, and drywall screws before filling in the crack.
To repair moving cracks in plaster, secure the loose or high side of the crack with plaster washers before filling in the crack. Although the washers will flatten as the screw is driven into place, they will still stand slightly above the wall surface. To help make the seam invisible and to prevent future cracking, carefully apply jointing tape, so that the tape overlaps the join.
Allow to dry and then use medium grade sandpaper and a sanding block to create a smooth and level surface. My Account. Order line. How to repair walls. If this is the case, you may need to make two or more applications Most plasterboard comes in either 9.
Then, use a wire brush to clean the area. Step 2 Thoroughly dampen the surface surrounding the repair with a mix of PVA glue and water. Step 3 Following the manufacturer's instructions, mix the quick-drying patch plaster. Step 5 Cut a small section of plaster onto the plastering trowel and apply to the repair with vertical and horizontal movements. Step 6 Following the manufacturer's instructions, leave the plaster to dry. Step 7 Using the edge of a clean trowel, work across the plaster repair to smooth the finish.
Step 2 Measure the hole then clearly mark the measurements onto a piece of plasterboard offcut. Step 3 Add an extra 25mm at the top and bottom, then cut the offcut to size with a plasterboard saw or retractable knife. Step 4 Using a pencil and straight edge, mark the original measurements without the additional 25mm overhangs onto the wall. Several coats were applied, the first keying into the spaces between the lath to make a stable base.
Finish coats came after the base had dried. Replace any missing lengths of lath, and refasten all loose pieces. Use drywall screws, and always drill pilot holes to avoid splitting the wood. Then you can screw new or loose lath to it, as if it were a stud. Drill until the bit hits the lath. If it misses, pencil a mark by that hole. Vacuum the holes and spray them with plaster conditioner. Wait 15 minutes, then fill all unmarked holes with a squirt of plaster adhesive.
Wipe off the excess with a damp rag. Dry lath and the exposed plaster edge will suck water out of wet plaster before it has a chance to harden. To prevent this, saturate those surfaces with conditioner. In some cases, you may need to repair the wood lath behind a hole. If so, follow the steps below. If the lath behind the hole is damaged, cut the damaged wood out with a keyhole saw or similar cutting tool, or with a chisel and mallet.
Take a piece of metal lath, which is similar to heavy screen, and insert a wire loop at the center of the lath. Holding the wire tightly, push the metal lath into the hole and pull the wire so that the metal lath is pressed firmly against the inside of the hole.
Twist the metal wire tightly around a wooden dowel making sure the dowel is pressed firmly against the wall. Apply a coat of plaster until it fills the hole and cross-scratch it as it begins to set.
Once the area is dry, remove the wooden dowel and cut the wire with wire cutters. Apply a thin layer of joint compound and let it dry for 24 hours. The area can be painted or wallpapered after sanding and being wiped down with a damp sponge.
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Author: True Value. Helpful Tip A shop vacuum is a great tool for cleaning up sanding dust. Step 2: Smooth and Patch Smooth and remove loose plaster pieces and any jagged edges on the surface around the crack with a putty knife.
Safety Alert! Helpful Tips Excess moisture in the wall or room can affect the plastering, so make sure to fix any leaks or causes of moisture several weeks before plastering.
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