Is it possible to fix a roof to an Interbloc wall?

Not only is it possible to fix a roof structure to Interbloc walls, it's also very common in industrial and agricultural situations.

Yes, it is possible to fix a roof to an Interbloc wall. There are two common configurations for structures fixed to the top of an Interbloc wall:

20-Series-block-mounted-600x451 Steel framed, canvas clad container shelter: This type of shelter is typically made up of a steel frame with canvas panels attached. The frame is fixed to the top of the Interbloc wall using bolts or other connectors.
Steel framed, steel clad traditional shed structure: This type of shed is typically made up of a steel frame with steel panels attached. The frame is fixed to the top of the Interbloc wall using bolts or other connectors.

In both cases, it is most common to use flat top blocks. When vertical reinforcing is required, a recessed flat block should be used. A recessed flat block has an enlarged reinforcing duct to allow for the nut and washer on a vertical reinforcing kit to be countersunk. This ensures that the roof can fix to the top of the blocks free of obstructions.

It is important to keep in mind the enlarged reinforcing ducts and the space between them when designing the location where the columns/truss will fix to the top of the blocks. This will ensure that the roof is properly supported and that the load is evenly distributed.

Hole Spacings for Standard Flat Top Hole Spacings for Recessed Flat Top
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The distance from the edge of the block to the outside diameter of the reinforcing duct is 270mm. The reinforcing duct is 60mm diameter. The distance to the next reinforcing duct is 540mm. In the middle of the block is a lifting anchor with a 42mm diameter recess.  The distance from the edge of the block to the outside diameter of the reinforcing duct is 215mm. The reinforcing duct is 170mm diameter. The distance to the next reinforcing duct is 370mm. In the middle of the block is a lifting anchor with a 42mm diameter recess.


When placing a more traditional steel shed structure on top of the blocks, consider the use of slotted bolt ducts where the roof fixes to the top of the blocks. This will allow for any minor movement in the wall over the operating life of the structure.

Specific engineering would need to be taken on the roof structure and the Interbloc wall where a roof is being placed on top of the wall. This is to ensure that the structure is safe and can withstand the loads that it will be subjected to.

Here are some additional considerations when fixing a roof to an Interbloc wall:

  • The roof should be designed to shed water away from the wall.
  • The roof should be properly anchored to the wall to prevent it from blowing away in strong winds.
  • The roof should be made of a material that is resistant to the elements.

By following these guidelines, you can safely and securely fix a roof to an Interbloc wall.