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About our concrete water tanks & underground concrete tanks

We believe our tanks are superior to any others on the market. Here are just some of the reasons:

Close up of mesh showing starter bars bent to be incorporated in the floor

  • The inner formwork is supported by wooden blocks which are removed as the concrete is poured, allowing a perfect seal between the floor and the wall. Others use concrete blocks which remain and form a part of the tank, creating a "cold join" and potentially allowing a future leak.
  • We use Y12 starter bars in our mesh, not Y6, which are 3.5m long and bent so that they follow both the wall and the floor in one length. Combined with the separate wall mesh and floor meshes, this bonds the wall and floor together and makes them extra strong. Few others reinforce their tanks this well.


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  • In the event of a fire, a large tank (120,000 litres) can supply water back up to the main house. By setting up a petrol powered generator and pumping water up onto the house directly, via a reverse water sprinkler system, people can keep their homes cool and wet. Or if need be, jumping into the tank to keep cool and protected from flames and radiant heat could save a life.
  • Concrete water tanks built correctly will last a lifetime. They keep water cool, clean and algae free. This is because the tanks have 5-inch (125mm) walls and a six-inch (150mm) base, and are poured with 40-MPa strength concrete not 25 or 30 MPa.
  • Terry Miller Concrete Tanks also use plasticiser to keep up the strength in the tanks instead of water. And after 28 days of curing the strength of the concrete will be between 48 and 52 mpa. And each tank is poured individually on site.
  • These tanks come out white, which is a sign of the strength in the tanks. The MPa is a measure of how much concrete there is as parts per 1000 and indicates how much pressure it can withstand. The walls of the tank are vibrated all around to ensure that there are no air bubbles and that the concrete is compacted down.
  • Terry generally builds tanks in three sizes, 50,000, 105,000 and 120,000 either with a silo roof, concrete top or open top tanks.

Underground Concrete Water Tanks

Terry specialises is building concrete underground tank, and we have built hundred over the past few years.  Depending upon the load bearing weight, we go from 150mm to 200mm thickness for the top of the tank, and even more if required.

The largest of our heavy duty industrial concrete underground tanks will weigh approximately 64 tonnes when empty and you will be able to drive and/or park a truck over the top. 

We build these tanks with either six or eight support legs.  With these support poles the roof of this tank will take up to 20 tonnes in load bearing weight and/or can take up to one metre of dirt/fill.  We individually vibrate each leg in the tank to ensure the concrete is properly mixed.  This is a very strong tank.  You can use the top of the tank as a patio or bbq area; bury the tank completely or park your car on top!  We use F92/F102 mesh in the roof of this tank, and Y12 starter bars in the base of the tank, which is why they are so strong.

General Concrete Tank Information

All concrete is vibrated and mixed to over 40 MPa and poured at 80 slump, we also use both Dribond Chrystalis and Glenium 8100 plasticiser to keep up the strength in the tanks (instead of water) and after 28 days of curing the strength of the concrete will be between 48 and 52 MPa.

The base of the tank needs to be flat, preferably laser leveled, with 170 mm of compacted road base - no fill.  Remember these tanks are very heavy.  With the largest tank 27 cubic metres of concrete is poured.  The site for this tank needs to be at least 11 metres in diameter as this tank is 8.6 metres wide. There needs to be room for the scaffolding to be built up and the formwork to be laid out.

With our tanks all brass fittings are supplied and as many as required to fit your personal requirements.   You cannot see pour marks nor air bubbles in the walls. By using 40 MPa (not 25 or 30) the tanks when dried are white, not dull grey, and this is a sign of the strength in the tanks.

We comply with the Building Code of Australia, B1 Structural Provisions and the Australian Standards Code AS 3600 for Concrete Structures and AS3575 for retaining liquids.

Concrete water tanks keep your water cool under all conditions, are algae free and last for many, many years.  They will not rust, or burn or melt nor blow away, the water will not taint nor are there any inside liners to be replaced. And remember a decent concrete water tank adds value to your property!

The floors of the tanks are sloped into a 75 mm (3") drain plug for above ground tanks and a sump for below ground tanks, which enables the tank to be cleaned out thoroughly. And all required brass fittings are included in our price.

We can also supply at an additional fee safety ladders and platforms.





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