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Wetpour Sub Bases

If you’re considering installing a wetpour surface, understanding the importance of sub bases is crucial.

In this article, we’ll dive into what sub bases are, why they are essential for wetpour surfaces, and the different types available including MOT Type 1 stone, concrete, and macadam.

We’ll explore the benefits and drawbacks of each type, as well as share insights on which sub base is best for wetpour surfaces.

We’ll discuss factors to consider when choosing a sub base, proper installation techniques, and common mistakes to avoid.

Stay tuned for all the key information you need to know about wetpour sub bases!

What Are Sub Bases?

Sub bases are foundational layers that provide structural support and stability to various surfaces, including wetpour playground installations.

Their primary function is to ensure a solid base for the upper layers to prevent uneven settling and enhance the durability of the surface.

Surface stability is crucial in construction projects, and the sub base plays a pivotal role in achieving this stability.

Typically composed of compacted aggregate materials such as gravel or crushed stone, the sub base creates a strong foundation that distributes the load evenly across the surface.

By providing excellent support, the sub base minimizes the risk of cracks, rutting, and other forms of damage that can compromise the integrity of the surface.

Why Are Sub Bases Important for Wetpour Surfaces?

Sub bases play a crucial role in wetpour surfaces, particularly those used for safety purposes like playgrounds.

They provide a stable foundation for the wet pour rubber, EPDM rubber granules, and polyurethane binder to create a safe and impact-absorbing safety surface.

What Are the Different Types of Sub Bases?

There are several types of sub bases used in construction projects, with common options being MOT Type 1 Stone, concrete, and macadam.

Each type offers unique characteristics and benefits suited for different applications.

MOT Type 1 Stone

MOT Type 1 Stone is a popular sub base material known for its excellent load-bearing capacity and drainage properties.

It consists of crushed aggregate conforming to specific standards to ensure stability and compaction in various construction projects.

This versatile material not only provides a solid foundation for roads, driveways, and pathways but also promotes effective water drainage due to its permeable nature.

The angular shape of the crushed aggregate allows for interlocking, creating a stable base that can withstand heavy loads without deformation.

Moreover, MOT Type 1 Stone is suitable for a wide range of applications, from domestic landscaping projects to large-scale infrastructure developments.

Its compacted structure minimises the risk of settlement or shifting, ensuring long-term durability and structural integrity.


Concrete sub bases are known for their durability and long-term structural integrity.

They play a crucial role in ensuring the longevity of surfaces by minimising shifting and settling, thereby reducing the need for frequent repairs.

Sub base material selection is essential as it directly impacts the overall quality and stability of the finished surface.

Concrete sub bases are versatile, accommodating various surfacing materials like artificial turf, pavers, and gravel, making them ideal for a wide range of applications.


Macadam sub bases are composed of compacted layers of crushed stone and gravel, providing a stable and permeable foundation for various surfacing materials. They are commonly used in road construction and landscaping projects.

The composition of macadam sub bases allows for excellent drainage, preventing water build-up and reducing the risk of erosion.

This feature contributes to the longevity of the overall construction by minimising water-related damage.

Along with their permeability, macadam sub bases offer exceptional stability, capable of supporting heavy loads without significant deformation.

This makes them ideal for areas with high traffic volumes or where structural integrity is crucial.

What Are the Benefits of Using MOT Type 1 Stone as a Sub Base?

Using MOT Type 1 Stone as a sub base offers various advantages, including excellent load-bearing capacity, effective drainage properties, and superior compaction characteristics.

It ensures structural stability and durability for surfaces that require robust foundational support.

What Are the Benefits of Using Concrete as a Sub Base?

Concrete sub bases offer significant benefits such as exceptional durability, long-lasting stability, and versatility for supporting various surfacing materials.

They provide a solid foundation that withstands heavy loads and adverse weather conditions.

What Are the Benefits of Using Macadam as a Sub Base?

Macadam sub bases offer benefits such as permeability, stability, and cost-effectiveness.

They provide a reliable foundation for various surfacing materials, facilitating efficient drainage and supporting sustainable construction practices.

What Are the Drawbacks of Using MOT Type 1 Stone as a Sub Base?

Whilst MOT Type 1 Stone offers excellent load-bearing capacity and drainage properties, some drawbacks include its limited availability in certain regions, potential compaction issues, and higher initial costs compared to alternative sub base materials.

What Are the Drawbacks of Using Concrete as a Sub Base?

Despite its durability and stability, concrete sub bases may have drawbacks such as weight concerns, potential cracking over time, and increased labour costs for installation and repairs.

These factors need to be considered when choosing concrete as a sub base material.

What Are the Drawbacks of Using Macadam as a Sub Base?

Whilst macadam sub bases offer permeability and stability, some drawbacks include susceptibility to erosion, maintenance requirements for gravel resurfacing, and potential compaction challenges in high-traffic areas.

These factors should be considered when opting for macadam as a sub base material.

Which Sub Base is Best for Wetpour Surfaces?

Determining the best sub base for wetpour surfaces depends on factors such as the intended use, site conditions, and budget constraints.

While MOT Type 1 Stone, concrete, and macadam all offer unique benefits, the optimal choice should align with the specific requirements of the wetpour installation.

Factors to Consider When Choosing a Sub Base

When selecting a sub base for playground surfacing, several factors need to be considered, including the intended use of the area, the critical fall height requirements, the type of surfacing materials like rubber granules, and the existing soil conditions.

One crucial consideration in sub base selection is to ensure that it meets the necessary safety standards to protect children from injuries during play.

The sub base material must be compatible with the chosen playground surfacing to provide adequate cushioning and shock absorption.

Proper site preparation, such as ensuring proper drainage and addressing any soil compaction issues, is essential to create a supportive foundation for the playground equipment.

How to Properly Prepare and Install a Sub Base for Wetpour Surfaces?

The proper preparation and installation of a sub base for wetpour surfaces involve several steps, including:

  1. Site excavation
  2. Sub base compaction
  3. Geotextile membrane installation
  4. Precise leveling to achieve the required surface depth for optimal performance and safety

What Are the Common Mistakes to Avoid When Installing Sub Bases for Wetpour Surfaces?

Avoiding common mistakes during the installation of sub bases for wetpour surfaces is essential to ensure long-term performance and safety.

Errors such as inadequate sub base compaction, improper wetpour inlays, neglecting repairs, and insufficient maintenance can compromise the integrity of the surface and pose safety risks.

Frequently Asked Questions

What are Wetpour Sub Bases?

Wetpour Sub Bases are an important component of any wetpour playground or safety surfacing.

They are the layer of material that is placed beneath the wetpour surface to provide stability, drainage, and support.

What are the different types of Wetpour Sub Bases?

The different types of Wetpour Sub Bases include MOT type 1 stone, concrete, and macadam.

Each of these materials has its own unique properties and benefits when used as a sub base for wetpour surfaces.

Why is MOT type 1 stone a popular choice for Wetpour Sub Bases?

MOT type 1 stone is a popular choice for wetpour sub bases because it is a durable and stable material.

It is also permeable, allowing for proper drainage and preventing water from pooling on the surface.

What are the benefits of using concrete as a Wetpour Sub Base?

Concrete is a strong and long-lasting material that can provide excellent support for wetpour surfaces.

It is also highly resistant to wear and tear, making it a suitable choice for high-traffic areas.

What is the difference between macadam and other Wetpour Sub Base materials?

Macadam is a type of asphalt material that is commonly used as a sub base for wetpour surfaces.

It is known for its flexibility and ability to withstand heavy loads, making it a suitable choice for playgrounds and sports areas.

Which Wetpour Sub Base material is the best option?

The best option for a Wetpour Sub Base depends on several factors, including the intended use of the surface, budget, and location.

It is recommended to consult with a professional to determine the most suitable material for your specific project.

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