If you use lime putty from the start, mix up the set coat with play sand, or kiln dried sand 50/50. A conditioner is sprayed into each hole, followed by an injection of adhesive. just leave the seconds slightly back from the finished edge. A masonry drill bit will go through the plaster not through the wood. Step by step, Rory walks through the repair process, from g. Plaster of Paris and patching plasters harden quickly, so dont mix a lot at once. Cut fiberglass mesh and press it into the top of the plaster. Fill holes half full and press the plaster as deep into the hole as possible. then put the seconds on once it's dried (leave it a week or so if your using a lime putty mix (less for NHL or a backing plaster). Bringing back this old house James Koorey shows you how to restore beautiful, original plaster. Mix a small amount of patching plaster in a disposable cup. Now you can simply use either the backing plaster, or sharp sand and putty to put the firsts/scratch coat on.when you scratch it, do it at 45 degrees to the lathes, otherwise you might end up cutting through and loosing the keys on the back. Once the edge of the hole is sound, clean up the laths, brush then over to get rid of the dust, then damp them down with water. then you can put a little PVA round the side of the holes ready to fill with either a backing plaster, or some sharp sand and lime putty. Plaster is not easy to repair and is pretty expensive to install, but there are good arguments to be made for opting for lath and plaster over drywall. Use a sharp stanley knife to smooth off the edges of the holes you counterbored. use a spade/flat bit around the eges, and make some counterbores in line with the laths, then use stainless screws, and some large flat washers to screw back the existing plaster to the laths and give it back some strength. Follow the tips from This Old House general contractor Tom Silva and get a smooth surface that lasts. Give us a call at 20 or online for drywall and plaster repair service in the Star, Caldwell, Eagle, Kuna, Boise, Nampa, and Meridian, ID areas. If the rest of the wall is still quite sound, and not falling off (if it's a little loose you can still get away with it). Learn how to fix cracks in plaster walls with lath and adhesive in six easy steps. We have the experience needed to patch and repair lath and plaster walls and ceilings and you can be confident that we will do the job right the first time.
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