It allows for application with fewer steps since this plaster acts as base and finishing coat in one. At some point or another a homeowner may be faced with the task of plastering concrete walls to change the appearance of the wall, make it resistant to moisture, eliminate unsightly cracking, or to add texture. Dip the cement trowel into the bucket of cement and fill the trowel halfway with cement. Such walls have been subject to much abuse and become disfigured with hairline cracks, holes and chipping. This company create and produce a lot of plastering products and in my opinion, they are the best! If the water is absorbed rather than running off you can plaster directly onto the wall. 1995-2018 MH Sub I, LLC dba Internet Brands. It was commonly used in homes a very long time back. Old paint, dirt, mold and mildew all create problems. If you want to apply a single coat of plaster, make sure it is no thicker than 10 to 15 mm. Your walls should be free of paint, oil, and dust so the plaster can bond properly. Meg Jernigan has been writing for more than 30 years. Learn how to plaster a wall as we go step-by-step through protecting the room & treating the surface before plastering. Crouch down and push the plaster up the wall in a gentle arc, standing as you go to reach the higher parts. I live in an apartment building with concrete and plaster walls. Apply it in small strokes, making sure it is level and uniform. "http://www.homeserve.com - Plaster walls often crack, dent or get knocked, leaving you with an ugly hole. Clean mortar joints with a wire brush. Leave it rough if you prefer a textured look. The main reason for that is that portland cement needs exposed portland aggregate to grab to. She specializes in travel, cooking and interior decorating. For a flat finish apply a layer of dash that is almost liquid in consistency. Your walls should be free of paint, oil, and dust so the plaster can bond properly. The mixture can be placed in a bucket or wheelbarrow and blended by hand with a stirring stick. To help achieve this, you need to make dash by mixing one part cement to 1 1/2 parts coarse sand and add enough water so the mixture has a runny consistency. To enhance that inherent compatibility, select open-textured concrete masonry units that promote mechanical keying between the plaster and the base masonry wall. Read through a guide to plaster texture techniques (see Resources). Let the slush coat dry for a day. They are your new blank canvas! Follow these instructions to plaster the concrete walls in your home. Plastering a concrete wall Another aspect you should take into account is the joints of the walls with the ceiling. May people like it then as it was easily made, which made it popular, cheap and easy to find. Anyone can plaster a wall (really, anyone), but you need to follow a formula. The best way to clean this is with soapy water. We welcome your comments and Caulk any cracks and treat mold and mildew by first killing the mold and then removing any stains left by the mold. Required Thickness of the Cement Plaster The thickness of cement plaster depends upon its composition and the surface to be plastered. Website operating to this site, and use it for non-commercial use subject to our terms of use. 3. You need to prepare the wall and allow it to cure the drying time among plaster applications. Plaster cures best at 55 to 70 degrees F. The finished depth of the plaster should be between 1/2 inch and 5/8 inch. Check the plastic after 24 hours. At the top of your stroke, slide the trowel over 2-3 inches (5-8cm), then reverse the motion and bring it down again. Plastering a wall with mortar or a drywall mud allows you to give the wall a whole new look, while covering flaws in the wall’s surface. The Benefits of Using Rigid Foam Insulation. Slurry or dash is prepared by mixing 1 part cement to 1 and 1/2 parts coarse sand with the quantity of water sufficient to obtain a runny consistency. First, apply a thin layer of plaster or joint compound and then apply the tape. Attempt to get the sheeting as air-tight as possible. Put a second coat of plaster over the base coat using the same technique and plaster mix. The ratio of cement and sand for first coat plaster varies from 1:3 to 1:6. When you use finish plaster the water in the mix gets drawn from the walls as it dries. And at the end, there’s a video for you to watch of me practising what I preach. They create plaster products that are solely designed for high suction backgrounds like Brick and blockwork. Use a bonding agent on painted walls, when the paint is securely bonded to the wall. Wait a couple of hours until the plaster will dry out a little, and continue the job.Meanwhile you can plaster the opposite wall, using the techniques described above. Questions of a Do It Yourself nature should be Bonding: The floating coat plaster to use on less porous surfaces such as concrete and dense concrete block. Remove excess cement using the edge of the trowel in a scraping motion. Dash, slush and slurry all refer to the technique of creating a base coat. Apply a dash, slush or slurry coat to the concrete wall. Caulk cracks and kill any mold on the walls. It simply isn’t as porous! Before you begin to plaster your concrete walls you need to remove peeling paint and flaking bits of old plaster. First in order to successfully plaster a concrete or cinder block wall you need to have aggregate exposed in other words your walls need to be clean and any type of coating removed. Application of plaster to the concrete wall, its appearance, change its level, make it more moisture resistant, can you can add texture. Use a wire brush to clean stains left by the mold or mortar joints. You can’t just pick up a trowel and start throwing plaster on the walls. The layer should be somewhere from 10 to 15 mm thick. Follow the manufacturer's instructions. The mortar for plaster works … My house (~55 years old) has a stone foundation (~18 inches thick of HUGE s... Detecting electrical wire in concrete / plaster walls? View our Privacy Policy here. Leave the wall rough for a textured look. Plaster has been around for a long time now. Make sure you use the batch within about two hours. Bricks would suck the moisture from the plaster at a really fast rate where plasterboard draws little water due to the paper material. Keep your walls moist for a minimum of seven days for the plaster to set properly. Once you have successfully applied plaster, it is imperative you protect your walls from the sun and wind. The best way to plaster an internal brick wall is by using a backing coat from British Gypsum. Many garden and boundary walls are created using inexpensive cement blocks. Use a dash brush to cover the entire wall to a thickness of about 1/8 inch. You may freely link Waterproof insulating blankets can be purchased or rented from many hardware supply shops. Smear the plaster onto the wall, starting with the bottom corner. How To Plaster A Brick Wall. It has good adhesive qualities, which makes it easier to apply than browning. The texture of the concrete wall must be rough enough to hold the plaster. Applying plaster to a concrete wall can change its appearance, level it, make it more moisture-resistant and give you the opportunity to add texture. If the wall has been waterproofed, you must use metal lath or the plaster won't stick. By creating an account you agree to the Hunker, Detailed Instructions for Plastering over Cement, Tips for Applying Plaster and Solutions for Plaster Problems. You will probably need to add some plaster sand to your all purpose plaster and mix it with water. Tape plastic sheeting to the wall. Follow this video guide to learn how to apply decorative plaster to an aerated concrete wall Want to find more free DIY videos? If you have doubts about whether or not the concrete wall will hold the plaster, splash it with water. Mix your plaster according to the manufacturer's instructions, preferably in an area away from drying winds and direct sun. Install metal lath over the painted concrete wall if you don't want to sandblast. All rights reserved. Remember the thickness of the top coat should be 5 to 10mm. For brick masonry surfaces that are uneven, a plaster thickness of 12 mm or 18 mm is ideal. Blend a bag of plaster mix with water, according to the manufacturer's instructions. I will be renovating our attic and the major part of the project will be th... Plastering brick wall - partial hard plaster. If not used within that time, the plaster mix will harden and water cannot be added after it has hardened. You will have to prepare the wall and allow for curing and drying time between applications of plaster. Hi DIYers, I would like to apply a layer of plaster directly to my concrete... Sealing / Finishing stone foundation basement. suggestions. The texture of the concrete walls should be sufficiently rough so the plaster will adhere to it. Concrete walls are most common in basements and are prone to water and chemical damage causing discoloration, cracks and leaks. Use a wire brush to clean stains left by the mold or mortar joints. Start at one end of the wall at the top and work your way down and across the wall's surface. Apply your plaster to the wall as desired. Her offline credits include copy editing full-length books and creating marketing copy for nonprofit organizations. How to Adhere Drywall to a Concrete Block. If the wall has been painted and the paint is peeling or flaking, all of the paint has to be removed. You can do this by covering them with a plastic sheet the size of the walls, or by using several pieces of sheets joined together for larger walls. The easiest way to do this is to have the wall sandblasted. One coat plaster is a particular kind of plaster created to offer a simpler approach to plastering. Mix 1 part Portland cement, 1 to 2 parts of masonry sand and enough water to create a runny consistency. Smooth the plaster out for a flat wall. With the right tools, hard plastering brick walls is a relatively simple job. problems contact webmaster@doityourself.com. If you want a flat wall, smooth the plaster out. Then simply use a dishcloth, sponge, or cleaning roller to wipe down the walls. Use 7/8-inch concrete screws with washers spaced 12 inches apart to attach the lath to the wall. Wickes - DIY experts since 1972. Let the base coat dry. Plastering is the process of covering a wall surface with a thin layer of mortar for protection and decorative purposes. There are numerous advantages to having an aerated concrete wall: it is light, easy to put together, it has very effective thermal insulating properties and is nonflammable. Ways to Texture a Wall with Plaster or S... Ways to Texture a Wall with Plaster or Stucco. In this video, we are going to learn how to plaster over an aerated concrete wall. Spread the cement onto the wall, using the flat side of the trowel to smooth the cement. A poorly-prepared surface will eventually crack and sag and the plaster will come off the wall. In this article, I’ll explain how to prepare and plaster a wall from scratch. If … In this video, we are going to learn how to apply a decorative plaster coating to an aerated concrete wall. Let the slush coat dry for a day. Jernigan attended George Washington University, majoring in speech and drama. Use a dash brush to cover the entire wall to a thickness of about 1/8 inch. Concrete masonry provides an excellent base for direct application of portland cement plaster. If you plaster onto a high suction background it gives you little time to get a lovely finish. submitted to our "DoItYourself.com Community Forums". To obtain the raw concrete wall need to be sanded and then proceed plastering being careful to gradually decrease the percentage of sand, and once finish plastering, after an initial drying, wipe the wall with cement dust and with a mason’s wooden trowel you should work slowly to bring the surface to maximum smoothness level. While you can certainly glue drywall to a concrete block wall, there are significant disadvantages with this method of adhering it. In case of brick masonry the thickness of first coat plaster is in general12 mm and in case of concrete masonry this thickness varies from 9 to 15 mm. Prepare the concrete wall. To achieve this, a slurry is applied on the concrete surface. Cover the wall with waterproof insulating blankets (also known as a concrete curing blanket) for 48 hours to incubate the plaster while it cures. Unfortunately, while economical, these blocks are susceptible to being damaged by the elements, and many of the walls built with them begin to crumble and appear dilapidated. To help achieve this, you need to make dash by mixing one part cement to 1 1/2 parts coarse sand and add enough water so the mixture has a runny consistency. It’s also a thicker consistency that allows for thicker layers than with other types of wall plaster. For first coat plaster to use on less porous surfaces such as concrete and dense concrete block wall starting! Apartment building with concrete and plaster mix will harden and water can not be added after has. Bucket filled with warm water and chemical damage how to plaster a concrete wall discoloration, cracks and treat mold and mildew by first the... 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Mm or 18 mm is ideal the layer should be free of,... To 2 parts of masonry sand and enough water to create a runny consistency instructions, preferably an... Single coat of plaster directly onto the wall surface copy editing full-length books creating... Sealed will not adhere properly moist for a flat finish, use a dishcloth, sponge, or cleaning to...