screed bonding

Screed bonding is a crucial technique in construction and flooring projects, ensuring the stability and longevity of surfaces. Understanding its nuances and applications is essential for achieving optimal results in various projects.

What is Screed Bonding?

Screed bonding refers to the process of creating a strong adhesive bond between a new layer of screed and an existing substrate. It involves applying a bonding agent to the substrate surface before pouring the screed mixture, ensuring better adhesion and preventing detachment or cracking over time.

Types of Screed Bonding

There are two primary types of screed bonding: mechanical and chemical bonding. Mechanical bonding relies on physical interlocking between the fresh screed and the prepared substrate surface, while chemical bonding involves the use of bonding agents or primers to enhance adhesion.

Advantages of Screed Bonding

Screed bonding offers several benefits, including:

  • Improved bond strength and adhesion
  • Reduced risk of delamination or detachment
  • Enhanced durability and longevity of surfaces
  • Minimized cracking and shrinkage
  • Faster installation process

Materials Required for Screed Bonding

To execute a successful screed bonding project, the following materials are typically required:

Screed Mix

The screed mix consists of cement, sand, and water in precise proportions to achieve the desired consistency and strength.

Bonding Agent

Bonding agents, such as latex-based or acrylic-based compounds, are applied to the substrate surface to promote adhesion between the existing substrate and the new screed layer.

Tools and Equipment

Tools like trowels, floats, and mixing equipment are essential for mixing and applying the screed mixture, ensuring uniformity and smoothness.

Preparation Before Screed Bonding

Proper preparation is crucial for ensuring the success of a screed bonding project. This involves:

Surface Preparation

The substrate surface should be clean, dry, and free from any contaminants or debris that could interfere with adhesion. Any existing coatings or residues should be removed, and uneven surfaces should be leveled.

Application of Bonding Agent

The bonding agent should be applied evenly to the prepared substrate surface, following the manufacturer’s instructions. It is essential to allow sufficient drying time before applying the screed mixture.

Process of Screed Bonding

The process of screed bonding involves the following steps:

Mixing Screed

The screed mix is prepared by mixing cement, sand, and water in the correct proportions to achieve the desired consistency and strength.

Application of Screed

The screed mixture is poured onto the prepared substrate surface and spread evenly using trowels or floats. Care should be taken to ensure uniform thickness and smoothness.

Curing Process

After the screed has been applied, it should be allowed to cure properly according to the manufacturer’s recommendations. This may involve covering the surface hardened screed with a curing membrane or wetting it periodically to prevent rapid drying.

Tips for Successful Screed Bonding

To ensure optimal results, consider the following tips:

  • Follow manufacturer’s guidelines for mixing and applying the screed mixture.
  • Ensure proper surface preparation and application of bonding agents.
  • Monitor environmental conditions, such as temperature and humidity, during curing.
  • Use quality materials and equipment for the project.
  • Seek professional advice if unsure about any aspect of the process.

Common Mistakes to Avoid

Avoid the following mistakes to prevent issues with screed bonding:

  • Inadequate surface preparation
  • Incorrect mixing or application of bonding agents
  • Poor-quality materials or equipment
  • Insufficient curing time
  • Ignoring environmental factors

Applications of Screed Bonding

Screed bonding is commonly used in various applications, including:

  • Flooring installations
  • Renovation projects
  • Industrial and commercial construction
  • Repairing damaged or uneven surfaces

Cost Considerations

The cost of screed bonding depends on factors such as the size of the project, materials used, and labor costs. However, investing in proper screed bonding cement and techniques can help avoid costly repairs or replacements in the long run.

Maintenance and Care

Proper maintenance, such as regular cleaning and inspections, can help prolong the life of screed-bonded surfaces and prevent issues such as cracking or deterioration.

Environmental Impact

Screed bonding can have environmental implications, particularly regarding the use of cement-based materials. However, advancements in sustainable building practices and alternative materials are helping to mitigate these concerns.

Future Trends in Screed Bonding

The future of screed bonding is likely to involve advancements in materials and techniques aimed at enhancing performance, sustainability, and efficiency in construction projects.

Understanding Bonded Screed

screed bonding

Bonded screed refers to a layer of screed that is directly bonded to the substrate or base surface. Unlike an unbonded screed or floating screeds, which are separated from the base by a damp proof membrane, bonded screeds adhere directly to the substrate, forming a strong bond.

Types of Bonded Screed

There are several types of bonded screed, including:

  • Cementitious Bonded Screed: Comprising a mixture of cement, sand, and water, cementitious bonded screeds offer excellent strength and durability, making them suitable for a wide range of applications.
  • Polymer-Modified Bonded Screed: Incorporating polymers into the screed mixture enhances flexibility, adhesion, and resistance to cracking, making it ideal for areas prone to movement or vibration.

Benefits of Using Bonded Screed

Bonded screed offers numerous benefits, including:

  • Enhanced bond strength and adhesion to the substrate
  • Improved resistance to cracking and shrinkage
  • Greater durability and longevity of surfaces
  • Increased stability and load-bearing capacity
  • Reduced risk of delamination or detachment

Bonding Ardex Screed Cements

Bonding Ardex screed cements involve the application of bonding Ardex screed cements products onto substrate surfaces to create a bonded layer. This bonding ensures excellent adhesion, strength, and durability, making it an ideal choice for various flooring applications.

Understanding ARDEX Bonding Screeds

screed bonding

ARDEX bonding screeds are specially formulated cementitious mixes designed to provide exceptional adhesion and durability when applied to substrates. They offer high adhesion strength and superior bonding properties, making them ideal for a wide range of flooring and construction applications.

Types of ARDEX Bonding Screeds

There are several types of ARDEX bonding screeds available, including:

  • ARDEX A35 Rapid Drying Cement Screed: Known for its fast-setting properties and high strength, ARDEX A35 is suitable for both bonded and unbonded applications.
  • ARDEX A46 Multi-Purpose Repair Screed: This versatile screed is designed for repairing and resurfacing concrete, masonry, and screed substrates, providing excellent adhesion and durability.
  • ARDEX A38 Rapid Set Cement Screed: Offering rapid setting and high compressive strength, ARDEX A38 is ideal for bonded applications where fast turnaround times are essential.

Advantages of Using ARDEX Screed Cements

Using ARDEX screed cements offers numerous advantages, including:

  • Superior bonding strength and adhesion to substrates
  • Enhanced durability and resistance to cracking and shrinkage
  • Rapid setting and curing times, allowing for faster project completion
  • Compatibility with a wide range of floor coverings and finishes
  • Ease of application and versatility in various construction and flooring applications

Screed bonding plays a crucial role in ensuring the stability, durability, and longevity of surfaces in construction and flooring projects. By understanding the process, materials, and best practices involved, contractors and builders can achieve superior results and deliver high-quality finished products.



  1. Is screed bonding suitable for all types of surfaces?
    • Screed bonding can be applied to various substrates, including concrete, wood, and tiles, but proper surface preparation is essential for optimal adhesion.
  2. How long does screed bonding take to cure?
    • The curing time depends on factors such as temperature, humidity, and the type of bonding agent used. It typically ranges from 24 to 72 hours.
  3. Can screed bonding be used for outdoor applications?
    • Yes, screed bonding can be used outdoors, but it’s essential to select materials and bonding agents suitable for the specific environmental conditions.
  4. What maintenance is required for screed-bonded surfaces?
    • Regular cleaning, inspections for damage or wear, and timely repairs are essential for maintaining screed-bonded surfaces.
  5. Are there any alternatives to traditional screed bonding methods?
    • Yes, alternatives such as self-leveling compounds or pre-bonded screed systems are available for specific applications and project requirements.