Resurfacing External Concrete Walls: A Guide?

This video demonstrates how to reface a concrete wall using hydraulic concrete mix according to the manufacturer’s directions. The mix is mixed in a plastic bucket and applied onto the walls using a trowel. The mix is then thinned with water to a pancake-batter consistency, skim coated, and smoothed out with a squeegee. Resurfacing can extend the lifespan of structurally sound concrete and restore the curb appeal of a home.

Resurfacing concrete is a good option when the surface of a wall, structure, or slab is cosmetically marred but in otherwise good shape. It can be done by grinding the existing concrete, repainting it, or applying a new layer of concrete over the old one. Different materials can be used, including epoxy coatings.

To resurface a concrete wall, clean up the wall, grind the top down to the raw concrete to ensure good adhesion for the cap. Repeat this process down the wall for both sides. Do not grind down all the way flat, as low spots will appear. Concrete resurfacing can be done by grinding the existing concrete, repainting it, or applying a new layer of concrete over the old one. Different materials can be used, including epoxy coatings.

To prepare the concrete substrates, use a machine that mechanically abrades the concrete, such as a grinder or shotblaster. Use a power washer to remove dirt and loose concrete, plug it in, connect it to a water source, and turn on the machine using the switch.

Can you put a thin layer of concrete over existing concrete?

Concrete resurfacing involves adding a thin layer of concrete to level out an existing concrete slab, creating a flat, smooth overlay that can be stained, stamped, or polished. This process is similar to pouring concrete over concrete but involves removing the old concrete and starting from the soil up. The cost of demolition and removal is around $2 to $6 per square foot, while laying a new slab costs an additional $4 to $8 per square foot.

Wet concrete cannot bond to dry concrete without an additional bonding agent, so adding a sand or gravel layer under a concrete slab can enhance bonding and create a stable foundation. The right choice depends on the height and thickness of the slabs, local laws, and the specific concrete slab used.

How can I make my outdoor concrete walls look better?

Concrete walls are increasingly being used in gardens to add privacy and block noise. Unlike wood, concrete is resistant to warping, rot, and strong winds. It offers numerous design options, including adding patterns, textures, landscaping plants, and custom artwork. A retaining wall spanning over one hundred feet was created using alternating layers of colored concrete, with rocks and natural debris sprinkled between each layer. The wall’s organic look was achieved with random voids.

Custom ironwork and built-in planters accentuated the curved concrete walls, creating a beautiful terraced garden. The walls were stained with an Italian slate stamp pattern, and the concrete walkways, steps, and patio areas were also stained to match the walls. Overall, concrete walls offer a versatile and practical solution for homeowners looking to enhance their garden spaces.

Can you put a skim coat of concrete over old concrete?

Concrete does not stick to concrete, so it is essential to properly prepare the slab and apply a chemical bonding agent to ensure proper adhesion. Staining the concrete surface can give it a refresh. However, pouring concrete over cracked concrete without repairing the cracks is not recommended. If the issues causing the cracking on the existing surface persist, they will affect the new surface. It is best to repair the cracks and resolve the issue before covering it up. ATD Concrete Coatings uses SunAcid for a concrete driveway color.

Can exterior concrete be resurfaced?

SUNDEK can resurface uneven concrete surfaces, ensuring a safer and less prone surface. Contractors apply a thicker coating to make the surface even, eliminating trip hazards and water puddles. The process begins with preparing the existing surface and then applies a concrete overlay, which can be colored, textured, or masonry-effects. The overlay lasts for years when properly applied and protected by a sealer, even with heavy foot traffic. Regular cleaning and maintenance can extend the lifespan of the patio.

How to resurface an exterior concrete wall?

To apply concrete resurfacer, pour a small amount on the surface and spread it evenly with a long-handled squeegee or trowel or brush. Work in segments of 144 square feet at a time, focusing on edges of control and expansion joints. If a second coat is needed, let the surface dry for two to three hours and apply the second coat following the same procedure. Most manufacturers recommend a second coat, but it’s optional. To create clean, professional-looking edges, get to them within the first 10 to 15 minutes of application.

What is the disadvantage of using skim coats?

Skim coating is a process used to cover up walls before painting, often used to smooth textured walls or cover minor damage or add a new wall to a home. It can be done with plaster, drywall mud, or other substances. Skim coating offers several benefits, such as cost-effectiveness, a skilled hand, and a time-consuming process. However, it requires a skilled hand and can be dusty and messy. Some people choose skim coating for its ability to make walls smooth before painting, while others choose it for minor damage or to cover up new walls. It is important to weigh the pros and cons before making a decision on skim coating for your Denver home.

Can you resurface concrete DIY?

The text offers a comprehensive overview of the process for applying a concrete sealer, beginning with the preliminary steps and culminating in the final result.

How to skim coat an exterior concrete wall?

Skim coating is a process where a thin layer of cement-based material is applied over an existing surface using a trowel or squeegee. This material then hardens into an even coat, covering any imperfections on the original surface. Skim coating is a simple yet effective solution for updating spaces, covering up cracks and imperfections. While typically applied to drywalls, it can also be applied to concrete surfaces. This article provides instructions on how to skim coat concrete walls and provides advice on how to maintain and care for them afterward.

Will new concrete stick to old concrete?

The minimum thickness of a concrete overlay depends on factors like the application method and aggregate size. Adding concrete over an existing slab adds 25 to 100 millimeters. Concrete is composed of sand and aggregates, and it cannot bond naturally to the existing slab due to its lack of natural bonding agents. A bonding agent or unbonded overlay method is needed to adhere the layers together. Properly installed concrete can last over 50 years, but the existing concrete’s condition affects the new overlay’s life span. To pour concrete over concrete, assess the existing slab for structural stability and check for tree roots, cracks or buckling due to frost heaves, and signs of settling.

Do it yourself concrete resurfacing?

A broom finish can be applied to the porch to create a non-slip, textured surface, which can then be sealed with a concrete sealer.

How do you finish an outside concrete wall?

Acrylic latex coatings are commonly used on exterior concrete surfaces for aesthetic purposes. They can be applied using brushes, rollers, or sprays, with a dry film thickness of 1 to 3 mils per coat. An acrylic primer is applied before two coats of finish paint to achieve a total system thickness of 3 to 6 mils. The primer is alkali-resistant and serves as a barrier, protecting topcoats from degradation due to substrate alkalinity. Acrylics are breathable, allowing moisture vapor to permeate the coating film to prevent blisters.

However, excessive water in the substrate can cause the acrylics to blister. Acrylic latex coatings do not serve as effective barrier coats and can allow moisture to permeate through the coating film into the concrete. They have limited elongation and do not resist cracking. They have reasonable color and gloss retention but are inferior to more expensive two-component polyurethanes or high-performance acrylic coatings.