If you want to install flooring, or improve an indoor or outdoor space, one of the first things you'll need to do is make sure that the concrete flooring is level. If it's not, you'll need to level it. With the right tools and clear directions, levelling a slab of concrete is not very difficult.
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Tools and Materials
Stock up on several tools, including a hammer drill and bit, small sledge hammer, chisel, trowel, and tools for mixing and laying out cement. You will also need concrete cleaner, self-levelling compound, sand, gravel, pre-mixed or ready concrete mix, quick-setting cement, a sand mix or vinyl concrete patch, and masonry crack filler.
Pick a time when the weather is moderate (neither too hot or too cold) and when it isn't raining, since humidity can adversely affect mixing compounds. Begin by sweeping the concrete floor to remove debris or residue. Place cracker sealer in any small cracks with a trowel or putty knife, and use a chisel to widen the bottom of any larger cracks before pouring in crack sealer.
Levelling the Concrete Floor
Clean the concrete floor again, this time using a broom and wire brush. Wash the entire floor with warm water, and wait for it to dry. Once it is dry, nail strips of wood across any doorways to prevent materials from accidentally leaking out of the room. Use levelling compound to prime the clean floors in the areas that need to be levelled out. One application should suffice, but in some cases, you may need to use two coats.
Do not walk on the concrete floor for 12 to 24 hours to give the levelling compound an adequate amount of time to set and harden.
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