Push back and consolidate the patch with a wood float. Patch render repairs, large and small areas, or whole house.Īpply the final coat with a neat butt joint between the old and new and with a slight bulge in the middle of the patch so that the final render consolidation will create a flat patch, flush with the surrounding render.ĭo not feather the edge of the patch over the surrounding plaster. Rake out any loose pointing in the wall behind and re-point roughly.īrush out loose dust and apply the render in thin coats following the guidance above and taking care to ensure that it is well pushed in beneath the undercut edges of existing plaster. You can also use an angle grinder, which is good for cutting out cracks for repair too. Use the chisel and lump hammer to cut away the bad render.īe careful not to be too enthusiastic and start lifting off the good render around the bad bits. To check for hollow render, lightly tap a hammer on the walls and when you hear a hollow sound, that is where the bit of render has come away from the substrate and needs to be replaced. Get your tools and equipment ready and clear the area to work around.įirstly, you need to identity the bad areas and then mark them with chalk. However if it is beyond repair or not worth saving hack it off, cutting back round the edges to sound plaster. Where render is cracked or hollow it may be possible to consolidate and save it, so further advice should be sought before hacking it off, especially if it is believed to be very old or is part of a listed building. When you are preparing the surface to repair, ensure that the edges of the patch are cut square to provide a key for the new mortar, and eliminate feather edging. This is a bit of good advice but is best suited to someone who has at least some experience of repairing rendering and using the sort of tools that people use to render and work with mortars. You can cut back using a bolster chisel but you risk loosening adjacent render. If patches of render have fallen off cut back the edges to a sound surface The best tool for this is a craft knife.
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