To create this article, 10 people, some anonymous, worked to edit and improve it over time. By using our site, you agree to our

Step 2: Use a Nail to Align Injection Points. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. Concrete consists primarily of cement, sand, gravel and water. Start on a mild but warm day and pray you don't get a serious rain until it's at least set up. Once the final layer has dried, sand the area with medium-grit sandpaper until it's smooth, then paint over the crack with latex primer and wall paint. Next, cut a V-notch 1/4 to 1/8 inch along the crack to help keep the compound in place and remove any debris inside the crack with a vacuum hose. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/26\/Repair-a-Poured-Concrete-Wall-Step-1.jpg\/v4-460px-Repair-a-Poured-Concrete-Wall-Step-1.jpg","bigUrl":"\/images\/thumb\/2\/26\/Repair-a-Poured-Concrete-Wall-Step-1.jpg\/aid1067109-v4-728px-Repair-a-Poured-Concrete-Wall-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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If I formed up the hole and poured a regular concrete mix into it would that work?

Spread some sealer onto the base of one of the plastic injection ports, being careful not to plug up its hole. Do this by enlarging the crack using a concrete chisel and a hammer. If desired, you can patch the severed ports with a little crack sealer.Get the latest This Old House news, updates and special offers every week, direct to your inbox. If you know how to fill small cracks in concrete, you’ll restore your concrete to a smooth finish.

If you find hairline cracks, don’t sweat it.

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Several masonry patching products, such as hydraulic cement, do an adequate job of filling cracks in concrete walls. Using a putty knife, fill the crack by applying as many coats of joint compound as you need. If the crack is slightly damp, dry it with a blow-dryer, then wait 15 minutes. Also, cover the entire flange of each injection port with crack sealer, leaving only the extended neck portion showing. By using our site, you agree to our There is a 1-inch diameter PVC pipe inside a 200 mm concrete wall. The mix itself is not strong enough to bear its own weight without interior support.

You can patch the crack to repair it.

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thick and 1 in. First, scrub the crack clean of any loose concrete, paint or old filler using a wire brush.