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Interbloc Specialist Concrete Blocks

Interbloc is a high productivity, low labour, high quality precast concrete construction system. At the heart of the system is a unique interlocking block which measures 1200 x 600 x 600mm and weighs one tonne. About 80% of an Interbloc structure will utilise this block - what we call the 1200 standard block. However the Interbloc system includes a range of other block configurations, designed to solve specific requirements for your Interbloc build.

Here's a comprehensive list of these block variations.

Flat Top

This block is used on the top layer of a wall to provide clean finishes. Flat top blocks provide wide, flat surfaces to fix structures to (like roofs).

Variations of the flat top block include:

Interbloc 1200 Flat Top on the left. On the right, image shows a 1200 flat top block on a PKE Bin with a roof attached,

Flat top blocks are often used for dry storage with PKE/feed bins and fertilisers bins. They are also added to other applications like aggregate bins.

Flat Bottom

This block is used to ensure seamless connectivity to the structure’s foundation. It allows moisture-critical structures to be sealed from the foundation to the top of the block. This makes it ideal for structures where moisture proofing is essential.

Variations of the flat bottom block include:

Interbloc 1200 Flat Bottom block on the block. On the right the 1200 flat bottom block at the base of a fertilizer bin for Ballance Agri-Nutrients

Ballance Agri-Nutrients Waikato used flat bottom blocks to help create a seamless connection to their bulk fertiliser bin’s foundation.


The angle block is designed for bins and walls where the wall ‘steps down’ from the top of the structure to the foundation. It provides a smooth and angled front edge to the wall, making a clean finish.

Interbloc Angle Block on the left. On the right is the angle block on bulk fertiliser bins for the Viterra project

The Viterra Project effectively uses the angle block to ensure health and safety standards were met. It also ensures that material doesn’t aggregate at the top of the walls.


This block is designed for bulk storage structures, such as fertiliser stores. It eliminates the aggregating of material at the top of the wall. The capper block delivers important health and safety benefits, as it removes the possibility of staff accessing the top of the wall.

Variations of the capper include:

Interbloc 1200 Capper on the left. On the right is the 12oo capper on an aggregate bin

Aggregate Bins with 1200 Cappers on top


The base block increases the capacity of the wall, decreases the foundation and bearing capacity requirement of the foundation, is as easy as a standard wall to install. It also has the added benefit of keeping bins cleaner by preventing aggregation of material in corners etc

Interbloc Base Block on the left. On the right is the base block used in Fulton Hogan Silverdale's aggregate bins.

Fulton Hogan Silverdale

To start building with Interbloc’s specialist blocks, or to add them to an existing project get in touch with us today.

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