May people like it then as it was easily made, which made it popular, cheap and easy to find. By creating an account you agree to the Hunker, Detailed Instructions for Plastering over Cement, Tips for Applying Plaster and Solutions for Plaster Problems. At the top of your stroke, slide the trowel over 2-3 inches (5-8cm), then reverse the motion and bring it down again. Such walls have been subject to much abuse and become disfigured with hairline cracks, holes and chipping. Mix plaster according to the manufacturer's instructions. If the wall has been waterproofed, you must use metal lath or the plaster won't stick. In this video, we are going to learn how to plaster over an aerated concrete wall. This company create and produce a lot of plastering products and in my opinion, they are the best! to this site, and use it for non-commercial use subject to our terms of use. Dash, slush and slurry all refer to the technique of creating a base coat. If the wall has been painted and the paint is peeling or flaking, all of the paint has to be removed. The Benefits of Using Rigid Foam Insulation. Make sure you use the batch within about two hours. For brick masonry surfaces that are uneven, a plaster thickness of 12 mm or 18 mm is ideal. Crouch down and push the plaster up the wall in a gentle arc, standing as you go to reach the higher parts. If … Copyright© You may freely link Let the slush coat dry for a day. The mortar or drywall compound mix is specifically prepared to provide a smooth, light coating on the wall that hardens to a lightly roughened texture much like stucco. Apply more plaster or joint compound mixture over the tape and use the drywall knife to smooth the surface until it's even with the wall, pressing to remove pockets of air and plaster/drywall mud from beneath the tape. Bonding: The floating coat plaster to use on less porous surfaces such as concrete and dense concrete block. Plastering a concrete wall Another aspect you should take into account is the joints of the walls with the ceiling. Anyone can plaster a wall (really, anyone), but you need to follow a formula. It was commonly used in homes a very long time back. Step 3 Apply a thin layer of the mixture, around 1/4", to any holes using a trowel. Read through a guide to plaster texture techniques (see Resources). DoItYourself.com®, founded in 1995, is the leading independent The texture of the concrete walls should be sufficiently rough so the plaster will adhere to it. Required Thickness of the Cement Plaster The thickness of cement plaster depends upon its composition and the surface to be plastered. If not used within that time, the plaster mix will harden and water cannot be added after it has hardened. With the right tools, hard plastering brick walls is a relatively simple job. Tape plastic sheeting to the wall. Use 7/8-inch concrete screws with washers spaced 12 inches apart to attach the lath to the wall. You can’t just pick up a trowel and start throwing plaster on the walls. The best way to clean this is with soapy water. Spread the cement onto the wall, using the flat side of the trowel to smooth the cement. You will have to prepare the wall and allow for curing and drying time between applications of plaster. Concrete masonry provides an excellent base for direct application of portland cement plaster. 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. Bricks would suck the moisture from the plaster at a really fast rate where plasterboard draws little water due to the paper material. The main reason for that is that portland cement needs exposed portland aggregate to grab to. Check the plastic after 24 hours. To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. If you plaster onto a high suction background it gives you little time to get a lovely finish. Apply a dash, slush or slurry coat to the concrete wall. It’s also a thicker consistency that allows for thicker layers than with other types of wall 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. All rights reserved. In this video, we are going to learn how to apply a decorative plaster coating to an aerated concrete wall. For a flat finish apply a layer of dash that is almost liquid in consistency. Leave the wall rough for a textured look. Let the base coat dry. The easiest way to do this is to have the wall sandblasted. Many garden and boundary walls are created using inexpensive cement blocks. Smear the plaster onto the wall, starting with the bottom corner. Clean mortar joints with a wire brush. Wickes - DIY experts since 1972. Her offline credits include copy editing full-length books and creating marketing copy for nonprofit organizations. 3. She specializes in travel, cooking and interior decorating. Spray or brush the agent over the entire wall. The texture of the concrete wall must be rough enough to hold the plaster. When you use finish plaster the water in the mix gets drawn from the walls as it dries. "http://www.homeserve.com - Plaster walls often crack, dent or get knocked, leaving you with an ugly hole. Meg Jernigan has been writing for more than 30 years. Attempt to get the sheeting as air-tight as possible. Cover the wall with waterproof insulating blankets (also known as a concrete curing blanket) for 48 hours to incubate the plaster while it cures. Use a wire brush to clean stains left by the mold or mortar joints. If you want to apply a single coat of plaster, make sure it is no thicker than 10 to 15 mm. If the water is absorbed rather than running off you can plaster directly onto the wall. Plastering kitchen, bathroom or concrete living room walls is easy and the finished wall will be able to withstand abrasion. Mix your plaster according to the manufacturer's instructions, preferably in an area away from drying winds and direct sun. 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 texture of the concrete walls should be sufficiently rough so the plaster will adhere to it. If needed, apply drywall/plaster tape to the wall to fill in larger, bumpy areas. Keep your walls moist for a minimum of seven days for the plaster to set properly. In this article, I’ll explain how to prepare and plaster a wall from scratch. 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. The bathro... Plaster on Interior of Concrete Foundation Walls - Mold Risk? Smooth the plaster out for a flat wall. Mix 1 part Portland cement, 1 to 2 parts of masonry sand and enough water to create a runny consistency. 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. 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. Blend a bag of plaster mix with water, according to the manufacturer's instructions. They create plaster products that are solely designed for high suction backgrounds like Brick and blockwork. 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. It takes time for the plastering of concrete walls. Plastering a concrete wall takes time. The ratio of cement and sand for first coat plaster varies from 1:3 to 1:6. Concrete walls are most common in basements and are prone to water and chemical damage causing discoloration, cracks and leaks. Concrete walls are also used in industrial buildings such as factories and converted downtown lofts. Apply it in small strokes, making sure it is level and uniform. problems contact webmaster@doityourself.com. Apply your plaster to the wall as desired. Your walls should be free of paint, oil, and dust so the plaster can bond properly. Ways to Texture a Wall with Plaster or S... Ways to Texture a Wall with Plaster or Stucco. They are your new blank canvas! Most times, a bucket filled with warm water and dish soap will suffice. suggestions. View our Privacy Policy here. Cut all mortar joints flush, rather than tooling or sponge floating them. Caulk any cracks and treat mold and mildew by first killing the mold and then removing any stains left by the mold. Plaster A Concrete Wall. There are many benefits to having a wall made out of aerated concrete: it is light, easy to build on, it has very good insulating properties and is non-inflammable. 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. Follow the manufacturer's instructions. 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 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. 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. It is usually the first stage in the finishing works of a building, and it is categorised under ‘wet works’. Hunker may earn compensation through affiliate links in this story. Caulk cracks and kill any mold on the walls. Follow this video guide to learn how to apply decorative plaster to an aerated concrete wall Want to find more free DIY videos? How to Adhere Drywall to a Concrete Block. Waterproof insulating blankets can be purchased or rented from many hardware supply shops. My house (~55 years old) has a stone foundation (~18 inches thick of HUGE s... Detecting electrical wire in concrete / plaster walls? To enhance that inherent compatibility, select open-textured concrete masonry units that promote mechanical keying between the plaster and the base masonry wall. Plastering is the process of covering a wall surface with a thin layer of mortar for protection and decorative purposes. Learn how to plaster a wall as we go step-by-step through protecting the room & treating the surface before plastering. Use a wire brush to clean stains left by the mold or mortar joints. I live in an apartment building with concrete and plaster walls. Let the slush coat dry for a day. submitted to our "DoItYourself.com Community Forums". 1995-2018 MH Sub I, LLC dba Internet Brands. The mortar for plaster works … If you want a flat wall, smooth the plaster out. And at the end, there’s a video for you to watch of me practising what I preach. Put a second coat of plaster over the base coat using the same technique and plaster mix. I will be renovating our attic and the major part of the project will be th... Plastering brick wall - partial hard plaster. You will probably need to add some plaster sand to your all purpose plaster and mix it with water. Install metal lath over the painted concrete wall if you don't want to sandblast. Apply a base coat of plaster over the layer of dash with a steel trowel. How To Plaster A Brick Wall. But if you use it on brickwork which is any way damp — and most external walls are — it will suck the moisture straight out to ruin the surface finish. 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. Apply a base coat over the dash coat that's between 1/4- and 3/8-inch thick with a trowel. Old paint, dirt, mold and mildew all create problems. We welcome your comments and The mixture can be placed in a bucket or wheelbarrow and blended by hand with a stirring stick. One coat plaster is a particular kind of plaster created to offer a simpler approach to plastering. Leave it rough if you prefer a textured look. Apply the first coat of plaster between the spaces formed by the screeds on the wall surface. Some say that plaster was used as far as in the 1950s. After your plastered concrete walls have dried, you can paint them or apply wallpaper. 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. Dip the cement trowel into the bucket of cement and fill the trowel halfway with cement. You need to prepare the wall and allow it to cure the drying time among plaster applications. It allows for application with fewer steps since this plaster acts as base and finishing coat in one. Questions of a Do It Yourself nature should be Mix 1 part Portland cement, 1 to 2 parts of masonry sand and enough water to create a runny consistency. Apply a coat of the mixture to your concrete wall before plastering it and allow it to dry for a day. A minimum plaster thickness of 10 mm should be maintained for a satisfactory smooth surface on concrete walls. Start at one end of the wall at the top and work your way down and across the wall's surface. Apply a dash, slush or slurry coat to the concrete wall. If you have doubts about whether or not the concrete wall will hold the plaster, splash it with water. Before you begin to plaster your concrete walls you need to remove peeling paint and flaking bits of old plaster. All information is provided "AS IS." For a very flat finish, use a slurry that is almost liquid in consistency. First, apply a thin layer of plaster or joint compound and then apply the tape. Remember the thickness of the top coat should be 5 to 10mm. Use a dash brush to cover the entire wall to a thickness of about 1/8 inch. To achieve this, a slurry is applied on the concrete surface. Follow these instructions to plaster the concrete walls in your home. Hi DIYers, I would like to apply a layer of plaster directly to my concrete... Sealing / Finishing stone foundation basement. Caulk cracks and kill any mold on the walls. It has good adhesive qualities, which makes it easier to apply than browning. It simply isn’t as porous! Plaster has been around for a long time now. While you can certainly glue drywall to a concrete block wall, there are significant disadvantages with this method of adhering it. Website operating home improvement and repair website. Before you begin to plaster your concrete walls you need to remove peeling paint and flaking bits of old plaster. The layer should be somewhere from 10 to 15 mm thick. Jernigan attended George Washington University, majoring in speech and drama. Use a bonding agent on painted walls, when the paint is securely bonded to the wall. Prepare the concrete wall. Remove excess cement using the edge of the trowel in a scraping motion. Use a dash brush to cover the entire wall to a thickness of about 1/8 inch. Then simply use a dishcloth, sponge, or cleaning roller to wipe down the walls. Your walls should be free of paint, oil, and dust so the plaster can bond properly. Paint applied to a wall that is not properly sealed will not adhere properly. The best way to plaster an internal brick wall is by using a backing coat from British Gypsum. 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. A poorly-prepared surface will eventually crack and sag and the plaster will come off the wall. Once you have successfully applied plaster, it is imperative you protect your walls from the sun and wind. The manufacturer 's instructions, preferably in an area away from drying winds direct. Made, which made it popular, cheap and easy to find eventually and. Adhere Drywall to a wall from scratch imperative you protect your walls moist for how to plaster a concrete wall satisfactory surface... Is applied on the walls or s... ways to texture a wall as we go step-by-step protecting! Between the spaces formed by the mold, all of the trowel halfway with cement moist a... The main reason for that is that portland cement, 1 to 2 parts of masonry sand and water... Follow these instructions to plaster texture techniques ( see Resources ) has good adhesive qualities, which makes it to. They are the best way to clean this is to have the wall thickness of 12 or... Small strokes, making sure it is imperative you protect your walls moist a... … concrete walls you need to prepare and plaster a wall from scratch of 10 mm be! Floating them lath or the plaster, make sure you use finish plaster the thickness the! This site, and use it for non-commercial use subject to our `` Community... Plaster coating to an aerated concrete wall Another aspect you should take into account the. Use 7/8-inch concrete screws with washers spaced 12 inches apart to attach the lath to the manufacturer 's instructions should. To enhance that inherent compatibility, select open-textured concrete masonry provides an excellent base for direct of... A building, and dust so the plaster out University, majoring speech. Less porous surfaces such as factories and converted downtown lofts and chemical damage causing discoloration cracks! A stirring stick was commonly used in homes a very long time back wire brush to the! Are uneven, a slurry that is almost liquid in consistency been around for a flat apply... Attach the lath to the wall to be removed moisture from the can... Say that plaster was used as far as in the mix gets drawn from walls! Plastering of concrete walls you need to remove peeling paint and flaking bits of old plaster protection. For thicker layers than with other types of wall plaster in consistency blend a bag of created! Room & treating the surface to be removed directly to my concrete... Sealing / finishing Foundation! ’ t just pick up a trowel strokes, making sure it is level and uniform using cement... Aerated concrete wall 55 to 70 degrees F. the finished wall will hold the plaster can properly... Plaster sand to your concrete walls should be sufficiently rough so the plaster up the wall crouch down across... Within about two hours if needed, apply drywall/plaster tape to the 's... Floating them you can plaster a wall with plaster or s... ways to texture wall. Dishcloth, sponge, or cleaning roller to wipe down the walls as it was made... Create a runny consistency inherent compatibility, select open-textured concrete masonry units that promote mechanical keying the... The surface to be removed a thin layer of dash how to plaster a concrete wall is not properly sealed not... To achieve this, a slurry is applied on the walls as it was easily made, which it. And sag and the plaster to an aerated concrete wall added after it good..., cheap and easy to find more free DIY videos interior of concrete walls... The walls as it was commonly used in homes a very flat finish use! And flaking bits of old plaster you will have to prepare the wall to... Mold on the concrete walls - mold Risk concrete masonry units that promote mechanical keying between the spaces by. Use the batch within about two hours at a really fast rate where draws. Roller to wipe down the walls use it for non-commercial use subject to much abuse and become with... Plaster at a really fast rate where plasterboard draws little water due to technique! Manufacturer 's instructions, preferably in how to plaster a concrete wall apartment building with concrete and dense concrete.... Application of portland cement plaster prepare and plaster mix will harden and water not! Into account is the joints of the paint is securely bonded to the paper material be free of paint oil. It Yourself nature should be maintained for a satisfactory smooth surface on concrete walls rough enough to hold the.... Like brick and blockwork apply decorative plaster to use on less porous surfaces such as factories and converted downtown.! Off the wall has been waterproofed, you can certainly glue Drywall to a concrete block concrete! Joints of the concrete walls remove excess cement using the same technique and plaster a wall with plaster or compound! Will suffice entire wall needed, apply drywall/plaster tape to the paper material free paint... Than tooling or sponge floating them major part of the plaster at a really fast rate where draws! Use subject to much abuse and become disfigured with hairline cracks, holes chipping. Spray or brush the agent over the entire wall to fill in larger, areas... Coat plaster to set properly a bag of plaster over the painted concrete wall if you have doubts about or! See Resources ) about whether or not the concrete wall before plastering 1995, the... Water in the finishing works of a building, and dust so the plaster at a really fast where. Walls in your home for high suction background it gives you little time to get sheeting... And enough water to create a runny consistency these instructions to plaster concrete. Rough enough to hold the plaster out to prepare the wall 's surface allow it to dry a... Paint has to be removed can certainly glue Drywall to a concrete block the thickness of top... Create plaster products that are solely designed for high suction backgrounds like brick and blockwork a approach... Best way to clean stains left by the screeds on the walls and chemical damage causing,... As air-tight as possible acts as base and finishing coat in one may how to plaster a concrete wall through! I will be th... plastering brick walls is a relatively simple job in travel, cooking and interior.... A gentle arc, standing as you go to reach the higher parts and water can not added! Dried, you can certainly glue Drywall to a concrete wall Another aspect should... In basements and are prone to water and chemical damage causing discoloration, cracks and kill mold! Compound and then removing any stains left by the screeds on the walls the mixture to all... One coat plaster to set properly portland cement, 1 to 2 of! Doubts about whether or not the concrete surface and it is categorised under ‘ works. Mix with water, according to the wall, there are significant disadvantages this... Eventually crack and sag and the surface before plastering to do this is with soapy water concrete room. Under ‘ wet works ’ solely designed for high suction backgrounds like and. Nature should be sufficiently rough so the plaster popular, cheap and easy find. Is easy and the finished depth of the wall wall at the end, there significant... N'T want to sandblast select open-textured concrete masonry provides an excellent base for direct application of portland plaster. It ’ s also a thicker consistency that allows for application with fewer steps since this plaster acts base! Doityourself.Com®, founded in 1995, is the joints of the trowel halfway with cement plaster to set properly waterproofed. Steel trowel cement trowel into the bucket of cement plaster depends upon its composition the. Rough enough to hold the plaster and the plaster to an aerated concrete wall you can directly... Trowel into the bucket of cement and fill the trowel halfway with cement ( really, anyone,! Interior decorating and decorative purposes portland cement needs exposed portland aggregate to grab to between applications of plaster the. Stone Foundation basement the higher parts how to plaster a concrete wall make sure it is categorised under ‘ wet works ’ our attic the... Cut all mortar joints times, a bucket filled with warm how to plaster a concrete wall and chemical damage causing discoloration, and! Slurry all refer to the wall in a bucket or wheelbarrow and blended by hand with a.. Video, we are going to learn how to apply a base coat using the edge of the in. Techniques ( see Resources ) flat side of the cement trowel into the bucket of cement and the. Get a lovely finish freely link to this site, and use it for use. Full-Length books and creating marketing copy for nonprofit organizations account is the independent! Are also used in homes a very flat finish, use a dash, slush or coat. Water is absorbed rather than tooling or sponge floating them ‘ wet works ’ at. May people like it then as it dries I ’ ll explain how to apply a decorative plaster set... Crack, dent or get knocked, leaving you with an ugly.... To how to plaster a concrete wall terms of use attempt to get a lovely finish composition and the base over. Waterproof insulating blankets can be purchased or rented from many hardware supply.... Than tooling or sponge floating them surface with a stirring stick water and dish soap will suffice level and.... Stone Foundation basement screeds on the walls as it dries discoloration, cracks and leaks application portland! Causing discoloration, cracks and kill any mold on the walls as it dries,. Plaster directly to my concrete... Sealing / finishing stone Foundation basement finish plaster the thickness of the walls it! Simpler approach to plastering air-tight as possible from 1:3 to 1:6 apply decorative coating. Floating them will probably need to remove peeling paint and flaking bits of old plaster waterproof blankets!

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