How to Prepare the Ground Base for the Installation of Your Water Tank
Installing a water tank is a great investment for rainwater harvesting, garden irrigation, and reducing water bills. However, before setting up your poly water tank or steel water tank, you need a solid foundation to ensure its stability and longevity. A poorly prepared base can lead to uneven weight distribution, potential damage, and even tank failure.
In this guide, we’ll walk you through how to prepare the ground base for your water tank, covering site selection, leveling, base materials, and step-by-step preparation techniques. Whether you’re installing a small slimline tank, or a large-capacity water tank, these expert tips will help you get it right the first time.
1. Choosing the Right Location for Your Water Tank
Before you start preparing the base, it’s important to select an ideal location for your water tank installation.
Key Factors to Consider:
•Proximity to Downpipes – The tank should be positioned close to your gutter’s downpipe for easy rainwater collection.
•Ground Stability – Choose a firm, well-draining area to prevent soil movement.
•Accessibility – Ensure easy access for maintenance and plumbing connections.
•Sun Exposure – If possible, place your tank in a shaded or partially shaded area to prevent excessive heat exposure, which can reduce water quality. Although this is not necessary when you purchase a Tank Factory water tank, it can help prolong the life of your water tank.
2. Selecting the Best Base for Your Water Tank
The type of water tank base you need depends on your tank’s size, material, and capacity. Here are the most common base types and their suitability for different water tanks:
a) Crusher Dust Base (Highly Recommended)
Best for: Poly water tanks and small to medium steel tanks
•Provides a solid, even surface.
•Helps with drainage and reduces shifting.
•Requires proper compaction to prevent sinking.
b) Concrete Slab Base (Ideal for Large Tanks)
Best for: Large steel tanks and heavy-duty poly tanks
•Extremely durable and long-lasting.
•Prevents tank movement even when full.
•Needs to be at least 100mm thick with reinforced mesh for extra strength.
c) Compacted Sand and Gravel Base (Alternative Option)
Best for: Small poly tanks
•Affordable and easy to install.
•Must be compacted well to avoid shifting.
d) Paving Slabs (Not Recommended for Larger Tanks)
Best for: Smaller slimline tanks
•Easy to install but may shift over time.
•Requires proper leveling to prevent uneven weight distribution.
3. How to Prepare a Crusher Dust or Gravel Base for Your Water Tank
A crusher dust or gravel base is one of the most popular choices for poly water tanks. Follow these steps to create a strong foundation:
Step 1: Mark the Installation Area
•Use a measuring tape and stakes to outline the base area.
•Make sure the base extends at least 300mm wider than the tank’s diameter.
Step 2: Clear and Level the Ground
•Remove grass, rocks, and debris from the area.
•Dig the ground to at least 100mm depth for a firm foundation.
Step 3: Add and Compact Crusher Dust or Gravel
•Spread a layer of crusher dust or gravel evenly across the area.
•Use a compactor or tamper to firmly compress the material.
•Repeat the process until the base is even and stable.
Step 4: Check for Leveling
•Use a spirit level to ensure the surface is completely flat.
•Adjust if necessary to avoid tank tilting.
Step 5: Allow Base to Settle
•Leave the base to settle for 24-48 hours before placing the tank.
4. How to Prepare a Concrete Base for Your Water Tank
For large steel tanks or tanks in high-traffic areas, a concrete slab provides the best support. Here’s how to prepare one:
Step 1: Plan the Slab Dimensions
•The concrete slab should be at least 100mm thick.
•Extend the slab at least 300mm beyond the tank’s diameter.
Step 2: Excavate the Area
•Dig down 100-150mm to remove soft topsoil.
•Level the area before pouring the concrete.
Step 3: Install Formwork and Reinforcement
•Use wooden planks to create a frame around the excavation.
•Place reinforcing mesh inside the frame for extra strength.
Step 4: Pour and Level the Concrete
•Mix and pour the concrete evenly within the frame.
•Use a trowel to smooth out the surface.
Step 5: Allow the Concrete to Cure
•Let the concrete cure for at least 5-7 days before installing the tank.
5. Additional Tips for a Long-Lasting Tank Base
Avoid These Common Mistakes:
Placing the tank directly on soil – This can cause uneven settling and instability.
Using an undersized base – Always extend the base at least 300mm wider than the tank.
Skipping compaction – A loose base may shift over time, leading to potential tank damage.
Ignoring drainage – Ensure your base is slightly sloped for proper water runoff.
Regular Maintenance Checks
•Inspect the base annually for erosion or shifting.
•If using a gravel or crusher dust base, top it up when necessary.
•Keep the surrounding area clear of debris and weeds.
Why Choose The Tank Factory for Your Water Tank Needs?
Unmatched Quality and Durability
At The Tank Factory, we manufacture high-quality poly water tanks and steel water tanks designed to withstand Australia’s toughest conditions.
Largest Range in Australia
We offer 1,745 tank style, size, and colour combinations to suit every home, farm, or business.
Expert Advice & Support
Need help choosing the right water tank base or installation tips? Our friendly and knowledgeable team is here to help!
Get Started with Your Water Tank Installation Today!
A properly prepared base is key to ensuring the longevity of your water tank. Whether you need a crusher dust foundation for a poly tank or a concrete slab for a steel tank, following these steps will set you up for a successful installation.
Call our friendly and knowledgeable team on 1300 826 532 today—we’re here to help!
Or Explore our full range of water tanks here: