Be sure to press it down tightly into the bottom of the crack using your pointed trowel or a screwdriver. Insert the foam backing rod into the entire length of the crack.Once loosened, use your leaf blower or air compressor to remove all dust and debris remaining in the crack and ensure good caulk adhesion.Use a pointed trowel or putty knife to loosen up compacted dirt and remove weeds. If there are plants, dirt, or other debris inside the crack, they will need to be removed prior to inserting the backing rod.Instructions for filling deep gaps in concrete Foam backing rod (choose a size that is appropriate for your crack’s width).Here’s what you do to repair deep cracks. Backing rods are typically made of foam and expand to fill the space. If your narrow crack is deeper than one-half inch, you’ll need a backing rod to fill in the space before caulking. However, even if a crack is narrow, it could still be one that goes deep under the surface. For example, some products direct you to sprinkle the surface with water periodically and to keep the area under a tarp for a few days to keep it moist as the product hardens.Ĭoncrete cracks that are narrow can be repaired using a concrete caulk or concrete filler material. Smooth the product out on the surface, and prepare it for drying according to the product instructions.Make sure to press down hard into the gap to eliminate any air bubbles. Use a trowel or putty knife to fill the gap with the prepared product.Prepare the concrete repair product as directed on the instruction label.While it’s okay for the area to be a bit wet when you apply the repair product, pooled water cannot be present. Use a ShopVac to remove any remaining debris and standing water from the crack.This will help the repair product adhere. Spray the crack with a hose to eliminate dust.Take your wire brush and scrub all edges of the crack to be sure any debris has been removed.Use a chisel and hammer to knock away any pieces of concrete in the gap that are crumbling or loose.Be sure to wear a protective mask to prevent breathing in the dust that the project produces.Instructions for how to fill large gaps in concrete It’s best to use a concrete patching compound or a mortar mix. Unfortunately, you can’t use new concrete to repair old concrete because the wet form won’t adhere to the dried form without a special bonding agent. Let’s start by addressing the most urgent concrete repairs, which are large gaps. How do you repair large cracks in concrete? Water in the cracks poses an even bigger risk - flooding your basement - if the crack is close to the foundation of your house. Also, cracks in your concrete take in water, which washes away the soil underneath the concrete and makes the gap grow even more. Small cracks are easier to repair than the large gaps they grow into, so it’s best to fix the problem while it’s small. Keep your family and guests safe by filling in the gaps and making the hazardous spot safer. Small cracks in concrete grow and turn into large gaps, which pose safety risks such as trips and falls. Moving out? Get your security deposit back quickly with these simple tips The November home maintenance checklist everyone needs 4 things you should never bother to fix when selling your house
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