The aim is to bond the concrete together again, as well as prevent water from seeping through. While this is a highly effective method, it is not a do-it-yourself project. It should be done by foundation repair technicians. Thoroughly clean out the crack and about 1 or 2 inches beyond the crack. Use either a nylon brush or metal wire brush, along with TSP cleaning solution. Dry out the crack and the surrounding area with a heat gun. Using a scraping device such as an old screwdriver or nail, scrape out the crack.
Be sure to remove all loose debris, especially around the edges. Shake up or stir the crack filler. Add it to the crack. Try to press as much filler into the crack with the filler bottle as possible.
Generally, though, the filler will sit on the surface in the next step, you will press it in. Work in small sections. Complete one section of about 1 to 2 feet before moving onto the next section. Put on a latex or latex-substitute glove.
Much like pressing caulk into a crack, use your finger to press the concrete filler into the crack. Remove excess with your finger or with a cloth.
Use the putty knife to trowel the crack filler further into the crack. Also, flatten the crack filler over the crack. Remove debris with a hard bristle brush. When you are sure that no more loose bits and pieces come out, switch to the paint brush to get rid of dust. Dip the paint brush into the cup of water and moisten the inside of the crack. Scoop up a glob of cement with the putty knife, apply it to the crack, and smooth it in place. Repeat until the crack is filled and virtually invisible.
It is a good idea to work in thin layers rather than trying to apply a thick glob at the onset. Finally, sand the area to let it blend in with the rest of the plaster wall. More often than not, learning how to repair a crack in the wall brings you face to face with drywall. You will be heartened to learn that drywall repair is virtually identical to plaster repair, except that you do not need to use the fibreglass mesh unless the wall crack involves the seam between two sheets of drywall.
Apply joint compound to the crack in the drywall with a putty knife. If a seam is affected, remove old drywall tape and replace it with fibreglass mesh over which you then smooth the joint compound. Let the area dry and repeat as often as needed. Sand lightly, so as to let the fix blend in with the rest of the wall. As you can see, drywall repair or a crack in the wall that necessitates plaster repair is not that hard to do.
A stucco wall — in essence — is also a simple home repair chore, until you get to the artistic aspect of matching your stucco patch to the existing texture.
Use a 6" Ready-mixed joint compound applies more smoothly, especially for beginners. Setting-type joint compound must be mixed using a "mud tray" and a taping knife or putty knife. It can be smoothed out when partially dry, so very little sanding is needed, preventing dust from spreading around the room. If the crack is large, cover it with self-adhesive fiberglass mesh tape before applying the plaster. This will prevent the new plaster from cracking there if there is movement in the wall which caused the crack.
Apply 2 or 3 layers of compound over the taped area. The final layer can be smoothed out using a wet sponge. With each additional layer, extend the compound another 2 to 3 inches 5. Your last layer should extend 12 inches 30 cm beyond the original area. For this you should use a 6" taping knife. Use a feathering technique when applying the compound. With the knife at a degree angle, start at the center and pull the knife to the outside edges of each coat, increasing pressure the further away from the middle you get.
Paint over the patched area to match the rest of the wall. If you can see a raised section where you did your repair, sand it flush to the wall before painting so it blends seamlessly.
It's smart to wait at least 24 hours prior to painting to ensure the compound is completely dry.. Method 3. Enlarge the crack with a chisel and hammer. Patching material is heavy and will not fill a thin crack. A technique known as undercutting which is essentially chipping away at the concrete should be done to 1 inch 2.
This provides more surface area for the patching material to grip. Clean debris from the crack using a paint brush or a hand vacuum. Rinse it with water and dry it with a hair dryer. Prime the area with a concrete bonding adhesive. This will help the patching material adhere better to the concrete.
You'll want to use an old paintbrush to spread a thin layer around the edges and deep into the crack. Apply multiple coats of concrete patching with a stiff putty knife or pointed trowel. Press each layer into the crack and let dry completely between coats. Repeat until the crack is filled and level with the rest of the wall. Add texture to the patched area before it dries.
The patched area will look bad if it is smoother than the surrounding area. Matching new concrete to old concrete can be hard. Test your method of adding texture by applying a coat of patching mix to piece of wood, and roughing it up to see if the texture matches. Did you know you can get expert answers for this article? Unlock expert answers by supporting wikiHow. Nick Yahoodain General Contractor. Nick Yahoodain. Support wikiHow by unlocking this expert answer.
Not Helpful 0 Helpful 2. Include your email address to get a message when this question is answered. If you're seeing cracks in your wall, it's important to have your foundation inspected.
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