Problem is these are 8" wide concrete blocks that are hollow, and anything you put inside these holes drops down into the rows below. I have tried various places near my original hole and there seems to be the same problem. Holes develop in concrete block retaining walls when pressure from the soil behind it causes cracks to develop. Water may be used to make sure that all loose concrete particles are removed. Apply a coat of concrete adhesive to the hole. I used a soaked sponge to wet the bricks and mortar, making it easier for the cement to get a good bond. They were broken open for plumbing and electrical installations. Clean any parts of the wall that you plan to repair. Make you mix the consistency of peanut butter. We show you how to reinforce and patch the hole properly. Place a layer of mortar on the bottom of the hole and then place the new block on top of the mortar. When working with plaster, it's best to only work with small amounts on the hawk and trowel. Tools. Repairing the holes in a concrete wall involves undercutting the hole. The application is Using a wire brush, brush clean the cracks and the holes. Concrete mix; Trowel; Concrete float; 1. The cone should be slightly bigger on the top than the hole you wish to patch. Chisel out any loose pieces of cinder block around the edges of the hole and brush away any loose debris with a nylon brush. For a simple way to clear out loose debris, scrub the Try to build up a rhythm so you can cover the patch Lay a scrap board over the blocks to provide a surface that will catch any cement patch that falls so it can be scraped up with a trowel and reused, rather than ruining the surface below the wall. I have a long hole near my door post. You can create a smooth surface with a metal trowel. Filling a small and moderate crack is necessary to prevent unhealthy conditions in the home. I'm assuming your wall is made of concrete blocks (also called cinder or cement blocks). Use a hammer and cold chisel to chip out a dovetail shape inside the hole. Smooth the mortared area with a trowel. Freelance writing since 2009, Tom Ross has over 30 years of corporate management and hands-on experience in the supermarket industry. I might fill most of the void with spray foam. Changing the location of the cable, wire or pipe leaves a gaping hole through the brick wall where water, dirt and debris enter the structure. On the bright side, I've got very thick old walls that are a barrier to neighborly noise. Make cosmetic and waterproof repairs to concrete, masonry and stucco walls. I can drill one of the holes fine, but the other hole refuses to turn out neatly. How To Fix A Large Hole In Cement Block Home S Sf Gate. For more advice, see our online guides or leaflets How To Plaster a Wall and How To Prepare Walls & Ceilings for Decorating Do it right. Project Instructions Quantity Calculator Shopping List. Holes occur in a cement block for a number of reasons, ranging from the blunt force of something striking it to settling walls causing stress fractures. Use this step-by-step process to smooth out rough wall surfaces. Repair the hole in the wall with plaster. Trying to patch up a hole in a shower or tub wall can be a very tedious and cumbersome task. Use your trowel to smooth out the mortar on the surface. The easiest/fastest/cheapest solution to repairing the cinder block was using poured concrete and then painting the entire wall to mask the patch. How to Repair a Plaster Wall . The stuff expands pretty much so start at about a 50% fill and see where that gets you. I'm assuming your wall is made of concrete blocks (also called cinder or cement blocks). Continue to step-by-step instructions. I've had some water seeping through the walls in this area on rare occasions, so I am looking to make this a solid patch. 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