How to Stick Paving Slabs to Concrete

When it comes to creating a beautiful outdoor space, laying paving slabs on existing concrete can be a convenient and cost-effective option. However, to ensure that your patio is sturdy and long-lasting, it’s important to know the proper techniques for sticking the paving slabs to the concrete. In this quick guide, we will walk you through the step-by-step process of laying a patio on existing concrete. First, you need to prepare your concrete by cleaning it thoroughly and ensuring it’s level and free from any cracks or damage. Next, prime the back of the paving slabs with a cement-based primer, which will help them adhere securely to the concrete. Then, create a mortar mix by combining cement, sand, and water, and apply a 30mm layer onto the concrete. Carefully lay the paving slabs on top of the mortar, leaving small gaps of 8 to 10mm between them. Once all the slabs are in place, fill the joints with the mortar mix, making sure to smooth and level it. Finally, allow the mortar to set and cure before using your newly laid patio.

Can You Stick Slabs to Concrete?

When it comes to sticking slabs to concrete, one innovative solution is the Power Grab N Bond adhesive. This remarkable adhesive is conveniently applied straight from the tube using a sealant gun. It’s ease of use makes it a practical choice for DIY enthusiasts and professionals alike.

The adhesive not only provides a reliable bond, but it also offers exceptional durability. Whether youre dealing with heavy foot traffic or adverse weather conditions, the Power Grab N Bond holds up under pressure. It’s resistance to moisture, temperature changes, and UV rays makes it a reliable choice for outdoor applications as well.

Moreover, the adhesives flexibility ensures that it can absorb any natural movements or vibrations, reducing the risk of cracking or detachment. This makes it particularly suitable for installations where the slabs may be subject to slight movements over time.

The Benefits of Using an Adhesive for Sticking Slabs to Concrete

Using an adhesive to stick slabs to concrete offers several benefits. Firstly, it provides a strong bond between the slab and the concrete surface, ensuring durability and longevity. Adhesives can resist heavy loads, vibrations, and other external factors, making them a reliable option for slab installation.

Secondly, adhesives eliminate the need for additional mechanical fasteners like nails or screws, which can weaken the concrete surface or cause cracks. This not only simplifies the installation process but also ensures a cleaner aesthetic finish without visible fasteners.

Furthermore, adhesives help to create a seamless and smooth surface by preventing any gaps or spaces between the slab and the concrete. This is particularly important in applications where an even floor is required, such as in commercial spaces or homes.

Additionally, adhesives offer flexibility in terms of material compatibility. They can be used with various types of slabs, including ceramic tiles, natural stones, and even synthetic materials. This versatility makes them suitable for a wide range of construction and renovation projects.

Lastly, adhesives can provide excellent resistance to moisture, temperature changes, and chemicals, depending on the specific adhesive chosen. This makes them ideal for areas prone to water exposure, such as bathrooms, kitchens, or outdoor spaces.

In conclusion, using adhesives for sticking slabs to concrete provides strong bonding, simplifies installation, delivers a seamless finish, accommodates different materials, and offers resistance to moisture and other external factors.

When considering laying new paving slabs on top of an existing slab, it’s crucial to start with a level and prepared surface. One effective method is to use a full mortar bed on top of the old slabs. This approach ensures an even bed for the new paving, resulting in a sturdy and visually appealing finish.

Can You Lay Slab on Top of Slab?

Can you lay slab on top of slab? The answer is yes, it’s possible to lay new paving slabs on top of existing ones. However, there are a few important considerations to keep in mind before proceeding with this method.

Firstly, it’s crucial to ensure that the surface is level and prepared before laying the new slabs. This means removing any debris or loose material from the old slabs and thoroughly cleaning the area. A cleaner surface will allow for better adhesion between the old and new slabs.

To create a stable base, a full mortar bed should be used on top of the old slabs. This will provide an even bed on which to lay the new paving and help to prevent shifting or movement over time. The mortar should be mixed according to manufacturer instructions and spread evenly using a trowel.

Before laying the new slabs, it’s beneficial to plan out the layout and pattern in advance. This will help ensure that the slabs are arranged in a visually appealing and structurally sound manner. Precision is key when it comes to achieving a professional finish.

This may require waiting for a certain period of time depending on the specific product and manufacturer recommendations.

While it’s possible to lay new paving slabs on top of existing ones, proper preparation and installation techniques are essential for ensuring a durable and aesthetically pleasing result. It’s always recommended to consult with a professional or follow manufacturer guidelines to ensure the best outcome for your project.

How to Properly Clean and Prepare the Surface Before Laying New Slabs

  • Remove any existing slabs or debris from the surface.
  • Sweep the area thoroughly to remove loose dirt and dust.
  • Use a pressure washer to clean the surface and remove any stubborn stains or grime.
  • Allow the surface to dry completely before proceeding.
  • Inspect the area for any cracks or unevenness.
  • Repair any cracks or damage using a suitable filler or concrete patch.
  • Level the surface using a screed board or a self-leveling compound if needed.
  • Apply a concrete primer or bonding agent to improve adhesion.
  • Spread a layer of mortar or concrete mix evenly over the surface.
  • Trowel the mortar or concrete to achieve a smooth and level finish.

Source: How to Cover Old Paving Slabs (Easy Guide)

Additionally, inadequate cleaning and preparation of the surface may also be contributing factors. Properly removing any dirt, debris, and previous coatings is crucial to ensure a strong bond between the mortar and slabs.

Why Are My Slabs Not Sticking to Cement?

There are several reasons why your slabs may not be sticking to the cement properly. One possibility is that the mortar mix used during installation was not prepared correctly. If the mixture is too dry, it will lack the necessary adhesive properties to bond the slabs to the cement.

Another factor to consider is the surface preparation prior to laying the slabs. If the cement base isn’t properly cleaned and leveled, it can create irregularities and air pockets that hinder the adhesion process. It’s important to ensure that the surface is adequately compacted, smooth, and free from any debris or loose particles before applying the mortar.

In some cases, the issue may lie with the type of slabs being used. Different materials require different types of mortar and adhesives for optimal adherence. For instance, natural stone slabs may require a specific mortar or adhesive designed for their unique characteristics. It’s essential to choose the appropriate products that are compatible with the specific slabs you’re using to ensure proper adherence.

Climate and environmental conditions can also impact the adhesion of slabs to cement. Extremely hot or cold temperatures, as well as high humidity levels, can affect the curing process of the mortar. If the mortar doesn’t have enough time to properly set or dry, it may result in poor adhesion. It’s crucial to take into account the weather conditions and adjust the installation process accordingly.

Now that you’ve prepared the concrete and ensured it’s clean and free of any dirt or debris, the next step is to prime the slabs. This will help improve the adhesion between the slabs and the concrete base. Once the slabs are primed, you can start creating the mortar, which will serve as the adhesive between the concrete base and the slabs. With the mortar ready, it’s time to carefully lay the slabs in the desired pattern. Finally, to ensure a professional finish, fill in the gaps between the slabs with additional mortar, creating a seamless and sturdy structure.

How Do You Lay Concrete Slabs on Concrete?

When it comes to laying concrete slabs on concrete, proper preparation is crucial for achieving a strong and durable result. The first step is to ensure that the existing concrete surface is clean and free of any dirt or debris. This can be achieved by sweeping or vacuuming the area, and if necessary, using a power washer to remove stubborn stains.

Once the surface is clean, it’s recommended to prime the slabs before laying them. This involves applying a coat of primer to the underside of each slab to promote a better bond between the concrete and mortar. Primer can be purchased from your local hardware store and should be applied according to the manufacturers instructions.

Next, it’s time to create the mortar mix. This is typically done by combining cement, sand, and water in a ratio specified by the manufacturer. It’s important to mix the mortar thoroughly until it reaches a workable consistency, without being too wet or too dry. A wheelbarrow or large bucket can be used to mix the ingredients, and a trowel or shovel is useful for stirring the mixture.

With the mortar ready, it’s time to start laying the slabs. Begin by placing a layer of mortar on the prepared concrete surface, using a trowel to spread it evenly. Carefully place each slab onto the mortar, ensuring they’re level and have a firm bond with the surface. It’s important to leave a small gap between each slab for expansion and contraction.

This can be done using a fine sand or cement mix, which should be brushed into the gaps and then compacted with a broom or brush. This will help to stabilize the slabs and prevent weed growth.

Once the gaps have been filled, it’s recommended to wet the entire surface with a hose to aid in the curing process. This will help the concrete to harden and bond properly. It’s important to avoid walking or placing heavy objects on the newly laid slabs for at least 24 hours to allow the concrete to set and cure completely.

Following these steps will ensure a strong and long-lasting foundation for various applications such as patios, driveways, or walkways.

Different Types of Finishes or Coatings That Can Be Applied to the Concrete Slabs for Aesthetics and Protection

  • Epoxy Coating
  • Acrylic Sealer
  • Polyurethane Coating
  • Stamped Concrete Overlay
  • Stained Concrete
  • Textured Concrete
  • Exposed Aggregate
  • Polished Concrete
  • Colored Concrete
  • Integral Color
  • Acid Stain
  • Water-based Stain
  • Concrete Dye
  • Seamless Flooring
  • Decorative Sawcuts
  • Etched Concrete
  • Skim Coat
  • Anti-slip Coating
  • Anti-graffiti Coating
  • Imprinted Concrete

Additionally, using a bonding adhesive on a concrete surface provides a strong and durable bond, ensuring the longevity and stability of the adhered material. Whether it’s for a construction project or a simple DIY task, choosing the right bonding agent is crucial to achieve the desired results.

What Is the Best Way to Adhere Something to Concrete?

To achieve the best adhesion of a substance to concrete, it’s essential to use a bonding adhesive. Prior to applying the adhesive, it’s crucial to prepare the surface appropriately. This can be done by cleaning the concrete thoroughly to remove any dirt, dust, or contaminants that may hinder adhesion. In some cases, it may be necessary to use a concrete etching solution to create a rougher surface for better bonding.

Once the surface is prepped, the bonding agent can be applied. Using a brush, broom, roller, or sprayer, evenly distribute the adhesive over the concrete. It’s important to choose the appropriate adhesive based on the specific substance you wish to adhere to the concrete. Some bonding agents are specifically designed for different materials such as wood, metal, or stone.

One of the key benefits of using a bonding adhesive is that it helps to keep moisture out. Concrete has a porous nature, and without proper protection, it can allow water or other liquids to seep in, leading to damage and reduced adhesion.


In conclusion, sticking paving slabs to concrete is a relatively straightforward process that can be accomplished by following a few key steps. First, it’s important to prepare the concrete surface by ensuring it’s clean and level. Then, create a mortar mix with a 30mm layer to provide a stable base for the slabs. Lay the slabs, leaving small gaps between each one to allow for expansion. Finally, fill the joints with the mortar mix and allow it to set, ensuring a strong and durable bond.

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