How to Stamp a Concrete Sidewalk & Stairs
Patterned concrete or imprinted concrete is commonly referred to as "stamped" concrete. This is concrete, that while still wet, is impregnated with color or designs to resemble slate, stone, flagstone, brick, or wood. Quite often creative designs, such as leaves, shells, or twigs, are impressed in the concrete. When stamped concrete is used for stairs, steps, or sidewalks, the depressed designs provide traction as well as visual interest. Following basic instructions and using stamping tools and color agents, it's quite easy to stamp and color concrete sidewalks and steps to add curb appeal and visual interest to your home. Does this Spark an idea?
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Things You'll Need
- Rubber concrete stamps or mats
- Rubber mallet
- Concrete color additives
- Concrete hardener
- Release or antiquing powder
- Leaf blower
- Sealer
- Gloves
- Dust mask
- Eye protection
Instructions
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Choose your stamping design. Steps and sidewalks lend themselves to a smaller patterns than larger areas, such as a driveways, floors, or patios. Choose designs without large imprints that will trap water or catch a heel and cause a fall. If the pattern you choose has straight lines, they should run in the same direction as the pitch or drainage of the steps or sidewalks.
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Select colors to add to the concrete. Color is added with hardeners, concrete release powders, and/or colored sealants. A wide array of brands and types of concrete color agents are available from concrete contractors, online, or at building-supply outlets. Always read and carefully follow manufacturer's installation directions.
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Apply color and stamping to freshly poured concrete. After concrete is formed and poured, flattened, and smoothed, let it dry slightly to remove excess moisture. Broadcast or sprinkle liquid or powdered colored concrete hardeners across the surface. Spread the color agent over the concrete with a concrete float or trowel. The colored hardener will color and strengthen the concrete surface.
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Liberally cover the concrete surface with concrete release powder. The powder will add color and prevent the latex mat or stamp from sticking to the concrete.
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Start at the top step. Carefully position the mat or concrete stamp over the surface of the upper left corner of the step or beginning of the sidewalk. Use a rubber mallet or concrete tamping tool to firmly tap evenly over the entire surface of the stamp or mat to create a firm impression in the concrete. Lift the mat or stamp and carefully reposition it next to the first impression. Make sure that it's lined up correctly with the first impression, then tap evenly with the mallet. Continue this process until all the steps or the entire sidewalk have been stamped. Allow to dry for 24 hours.
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Use a leaf blower to blow off the excess concrete release powder remaining on the concrete. At this point additional layers of colored hardener can be applied. Any excess can be removed with a spray of water from a garden hose or with a wet rag. Allow to dry between coats.
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Let the concrete dry completely prior to sealing. Wait a minimum of 48 to 72 hours. Apply two to three coats of concrete sealer, following manufacturer's directions. Sealing will prevent dirt, grease, and oil from staining the concrete and will protect it from weather damage. Sealing is especially important in climates that experience freezing and thawing cycles.
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Tips & Warnings
Freshly poured concrete contracts or shrinks as it dries. This shrinking puts stress on the concrete that can cause cracks. To prevent cracking, contact joints must be cut in the concrete. Use a gas-powered concrete saw that can be rented from concrete contractors or equipment-rental outlets. The cuts should be made to about 1/4 of the depth of the concrete and at about four-feet intervals horizontally across the sidewalk. (Steps do not need expansion or contact joints.) If feasible, the contact joints should be cut at locations that will not interfere with the stamped design.
Wear gloves, a dust mask, and eye protection when working with color powders, hardeners, sealers, or acid-etch solutions.
