12/8/2023 0 Comments Limestone plasterThis article presents two separate tables (use the jump link below to fast forward to the one that interests you): Understanding density will assist in using the density of common construction materials provided in this article. Section off the area with tape or other items to keep children or pets from touching the wall.The simple equation for density. Give the wall time to cure thoroughly before testing the plaster or moving items into the area. Keep the plaster and the wall damp as you work Step Four – Allow to CureĪlthough lime plaster will feel hard to the touch in hours, it will not be cured for weeks. Each additional coat should be mixed with less aggregate so they will go on more smoothly and with less pressure. Once the scratch coat is applied, apply additional coats. Use a gauging trowel for the initial coat if it helps with the process. You will need to use solid pressure to work it into all the gaps. Push (render) plaster between laths to provide a solid surface. Lime plaster will follow wall contours and does not need to look flat and smooth. Use a thinner fill coat first to fill in hollows, and then apply the first coat. If it is too thin, it will go on nicely at first, but then start to sag.Īpplying lime plaster well takes experience. If the mortar is too thick, it will not stick smoothly. Mix only as much plaster as you are able to work with before it completes the initial set. Then add gauging material-animal hair, gauging plaster or Keene’s cement-according to directions. Mix the lime with sand to get the final mixture, using three times as much sand as lime to get the right proportions. Many experts suggest waiting 3 months before using a lime putty or hydrated lime to be sure it is properly slaked or ready to use. Lime plaster is made by using either a pre-mixed lime putty or hydrated lime that must be soaked for no less than 16 hours before use. The wall, including any stone or laths, should be thoroughly damp when you apply plaster. Don’t overspray as this will cause puddles and runs.Īllow the water to soak into the wall, then spray it again until the wall is completely damp. When the walls are ready, spray them with clean water using a spray attachment on a hose. Metal laths are quicker and less expensive to use but can be more difficult to plaster because they are slippery. Leave an 8 to 10 mm space between the laths, approximately the width of a finger. Split (not sawed) river oak or chestnut make the best laths. If you are plastering on wood laths, make sure the old plaster is smooth and any broken areas or lumps are removed. If you are doing restoration work, have an expert match your old plaster for a compatible mix. Lime plaster is softer than cement-filled modern plasters. Remove dust and loose material, but don’t remove old plaster only because it seems soft. If you are working with a stone or brick finish, remove old, decayed or hollow lime plaster. Wear protective clothing, gloves and safety glasses while making or handling lime plaster, and remove any bystanders from the area before working.īefore beginning with lime plastering, prepare the wall to be finished. WARNING: Lime plaster contains alkaline materials that easily burn skin and eyes. It is a common finish for small cottages, and modern eco-friendly builders use it as an ideal finish for hay bale or earth building. Lime plaster has the unique quality of being able to absorb and hold rain, allowing it to evaporate back into the air rather than allowing it to soak through the wall.
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