What is the best way to fasten securely a load onto a hollow brick?

Question

Due to the ongoing COVID pandemic, I decided to put a basketball hoop on one of our outside walls, so that me and my son can stretch a bit. The problem is that the wall I plan to put the basketball is built with hollow bricks, (see below).

The thickness of the brick is close to 10cm.
Additionnal specs :

the wall is getting its fair share or rain during autumn and winter and its facing the wind, so I want to make sure that no moisture will find its way in.

there may be some dunking (we are on average 100 kg each) involved so I need to make this as robust as possible.

I considered but I find them lacking :

screw plastic wall plugs

screw anchors

Toggle Bolts

expansion anchors

hollow wall anchors

In most of the cases my main worry is that because the brick is hollow the won't find enough support. So, I wonder what is the best practice for this type of brick.
I would greatly appreciate any guidance on the matter.

ingenørd · Accepted Answer

I'd recommend first making a hole to fill the channels in the brick with mortar/concrete locally. This way you will effectively have a solid brick which allows for a much stronger fastening and a much larger range of applicable anchors.
The anchors you show above are all mechanical anchors, which is not the optimal solution when a waterproof result is required. You could consider using a chemical anchor in the form of a threaded rod installed with an appropriate resin. (This will require filling the channels of the brick.)

What is the best way to fasten securely a load onto a hollow brick?

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