How much crushed stone is there under the pool?

It can be exciting to install an above-ground pool that transforms your backyard into a refreshing oasis for summer fun. But amid the excitement of choosing the perfect pool and planning the layout, the critical consideration of what lies beneath the pool is often overlooked. A common recommendation is to use crushed stone as a base. In this blog post, we will explore the importance of crushed stone and guide you through determining the optimal amount to create a stable and long-lasting base for your pool.

The purpose of crushed stone

Before we dive into the necessary amount of crushed stone, let's understand why it is a popular choice for creating a foundation under a swimming pool. Crushed stone, also known as crushed rock or stone dust, serves several purposes in this context.

1. Leveling the ground

   Crushed stone is an excellent material for leveling the ground. Its fine particles provide a smoother surface and help eliminate unevenness that could compromise the pool's stability.

2. Drainage

   Proper drainage is crucial to prevent water from accumulating under the pool, which can lead to issues such as erosion and instability. Crushed stone facilitates drainage and ensures that water can seep through the soil without causing damage.

3. Weed and pest control

   The compact form of crushed stone acts as a barrier against weeds and pests, minimizing the risk of them infiltrating the pool area. This is especially important for maintaining a clean and pleasant swimming environment.

Determining the amount

Now let's address the burning question: how much crushed stone do you need for your pool?

1. Calculate the pool's dimensions

• Start by carefully measuring your pool's dimensions. You will need the length, width, and depth. Be sure to account for any slopes or unevenness in the terrain.

2. Determine volume

• Use the measurements to calculate the volume of the space under the pool. The formula for the volume of a rectangular area is length × width × depth. If your pool is round, you can use the formula πr² × depth, where r is the radius.

3. Convert to cubic meters

• Since crushed stone is usually sold in cubic meters, convert the volume to this unit. Divide the volume in cubic feet by 27 (the number of cubic feet in a cubic meter). This will give you the required amount of crushed stone.

4. Take extra consideration for sloping terrain

• If your yard has a slope, you may need extra crushed stone to level the ground properly. Calculate the additional amount based on the extent of the slope.

5. Consider compaction

• Crushed stone tends to compact over time. To account for this, consider adding a little more to ensure the ground remains level and stable throughout the pool's lifespan.

Example calculation

Let's say your pool is 4.5 meters long, 3 meters wide, and has a depth of 0.9 meters. The volume would be 15 × 10 × 3 = 450 cubic feet. Converting to cubic meters (450 ÷ 27) gives you about 16.67 cubic meters. If there is a slope or you want to account for soil compaction, you can round up to 18 cubic meters.

Conclusion

In conclusion, careful calculations based on the pool's dimensions, terrain slope, and potential compaction are required to determine the right amount of crushed stone under your pool. Taking the time to create a solid foundation is an investment in your pool's lifespan and stability, ensuring a safe and enjoyable experience for many years to come. Do not underestimate the importance of this step in the pool installation process – the right amount of crushed stone can make a significant difference in the overall performance and durability of your above-ground pool.