How do you lay concrete over existing concrete?

Asked By: Remigia Gschmack | Last Updated: 20th February, 2020
Category: business and finance construction industry
4.4/5 (288 Views . 34 Votes)
To lay new concrete, sweep and clean the old concrete, and saturate the old concrete with water. Then, build a perimeter, or a wood brace, that is the same height as you want the concrete to be. Make sure the braces are level, and lay down a barrier of wire mesh over the existing concrete inside of the barrier.

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Subsequently, one may also ask, can I pour concrete over existing concrete?

If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. Proper prep work is key to success when layering new concrete over old. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up.

Furthermore, can you put aggregate over existing concrete? Exposed Aggregate Resurfacing For Existing Concrete But there are no hard and fast rules here as you can choose as many fleck colours as you like. One of the great benefits of exposed aggregate concrete resurfacing is its flecked or freckled appearance.

In this regard, how thick does a concrete overlay have to be?

The minimum recommended thickness is 1 to 2 in. (25 to 50 mm) for a fully bonded concrete overlay placed on a base slab that is practically free of cracks and in which the concrete is sound, clean, and of good quality.

Does concrete resurfacing last?

Thanks to its advanced bonding properties, concrete resurfacing can last for quite a while. A properly resurfaced floor can last from 8-15 years.

24 Related Question Answers Found

Can you pour concrete over dirt?

Pour concrete over a solid, well-drained base
Because concrete slabs “float” on the soil, soft ground or voids underneath may cause unsupported areas to crack under heavy weight like vehicles. Pack about 4 in. of sand or gravel over clay and other poorly draining soils to provide even support.

When can I remove concrete forms?

Removing forms before the concrete is truly dry.
The forms or “molding” that holds the concrete in place until it dries should be left alone for at least two days to ensure that the concrete is completely dry.

Will concrete overlay crack?

But overlays are only as good as the subbase they are applied to. They are not intended to fix bad concrete. If you put an overlay directly over a cracked surface, the overlay is likely to crack as well.

Can you stamp over old concrete?

You can only stamp concrete when it is still wet from a pour. To add texture to an existing patio, pour a fresh layer of concrete over the old and stamp it, provided the existing patio is in good condition. You can impress the look of brick work over a new concrete surface.

What is minimum thickness for concrete?

What is the minimum thickness for concrete? A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. Four inches is most common for a slab.

Can you pour a concrete slab on top of another concrete slab?

Yes, you may pour a concrete pad overlay over an existing slab. You need to consider the added height and weight of the overlay on the existing structure. Overlays may include polymers, portland cement concrete, or epoxies. You should improve the drainage of the slab by having a good slope on the overlay.

Can old concrete be resurfaced?

Resurface Old, Worn or Damaged Concrete
For a successful concrete resurfacing project, proper surface preparation is critical. Use only when the product, air, and surface temperatures are above 500F for a minimum of 24 hours. If not removed, Flo-Coat Concrete Resurfacer will not bond properly to the concrete surface.

How much does concrete overlay cost?

Concrete with a decorative overlay typically ranges in price from $7 to $12 per square foot while stamped concrete costs $8 to $20. Resurfacing breathes new life into a surface and costs less than installing a new slab.

How do you make a sloped concrete ramp?

To create the slope of the ramp, build the sides of the form with pieces of plywood cut at an angle along the top. The key to shaping the concrete into a slope is to use a stiff mixture; if the concrete is too wet, it will slump down to the bottom of the ramp, seeking its own level.

How do you resurface Pebble concrete?

How to Resurface an Aggregate Driveway
  1. Remove grime and grease stains with a power washer and a scrub brush.
  2. Fill any cracks and holes created by dislodged aggregate with vinyl concrete patching compound using a putty knife and trowel.
  3. Use a roller brush to apply a coat of bonding adhesive over the entire driveway.

Can you Pebblecrete over existing concrete?

If a single base coat and 2 coats of the product are applied the surface may build up to approximately 5mm over the existing concrete. It can be applied to any sound concrete including old pebblecrete.

How do you repair Pebble concrete?

In theory, patching the topping is easy: Clean the surface, let it dry, then stuff a mixture of two-part epoxy and pebbles that have been washed and dried into the gaps. Trowel the surface flat, let it cure for a day, and you're done.

How do you cover a concrete floor?

One of the easiest ways to cover your concrete floor is to paint it. There are a number of paints available, which are specifically designed for concrete floors. If you choose to paint, you will need one or more rollers, roller pans, extension polls, and paint. Select a paint color that fits your basement well.

What is concrete resurfacing?

Concrete resurfacing is a process by which concrete is cleaned, repaired, and overlaid with a new surface. Here is an overview of the steps involved for this fix to aging concrete: Cleaning.

Can you pave over existing driveway?

Asphalt Resurface (over Asphalt):
A #404 surface course of asphalt can be installed on top of existing asphalt. Since the product used for both layers is the same, the layers should heave together in the winter. However, before choosing this option, you should consider why your present drive is failing.

How thin can you pour concrete over existing concrete?

Maybe and maybe not. If done properly, new concrete can often be poured right over an existing slab. For this to be feasible, the contractor needs to pour at least 2 inches thick, use smaller aggregate, and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete.