Keep the level of the render well below the level of the surrounding plaster to allow room for the floating and setting layers. Moisten the laths and the surrounding plaster and apply a coat of render making sure that render is forced between the laths. If the laths are exposed and intact, clean the laths and plaster to remove any loose plaster and dust, and ensure that the gaps between the laths are clear. To repair large holes in plasterįor repairing larger holes in plaster it is better to use proper plastering techniques rather than just filler. Between each coat, lightly sand the surrounding plaster surface (but be gentle as lime plaster is extremely soft) and moisten the previous filler before applying the next coat of plaster filler. The filler used in holes may shrink as it hardens, and the surface may need to be built up using repeated coatings of filler. Use a wet filling knife across the hole to level off the filler to the surrounding plaster - if the hole is too wide to be bridged by the filler knife, use the knife around the edges and then work on the middle part. Press the plaster filler into the hole, making sure that it is pushed into the edges, so that the filler is proud of the surrounding plaster. When the plaster filler has been mixed and ready to use, dampen (but don't soak) the render at the back and sides of the hole by using a moistened brush or water spray. Repair small holes in plasterĬlean all the loose plaster and dust from the hole, if the hole is shallow, cut back the render to give a deeper depression in the plaster- if possible, undercut the plaster at the edges of the hole to provide a good key for the filler.
Have a look at this page for details of basic lath and plaster construction and techniques. It is always best practice to use the same type of materials, or similar, when doing a repair to lath and plaster. Repairing small holes - repairing large holes
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