How can I fill in an interior hole in a block wall?

Question

In an attempt to run Cat6 Ethernet cables to my living room, I cut a handy box sized hole in the the block, but was unable to run the cable down from the attic at the top of the wall (it was obstructed about 3 feet up or mid way on the wall). In the end we put the connections in the ceiling.  Now there is a 1.5x2.5 hole in the interior side of one concrete block.

My thought was to fill it using expanding foam and drywall mud.

What is the best way to fill it properly?

mongo · Accepted Answer

There are as many ways as opinions.
My suggestion would be to use mortar mix.  Several layers, letting it cure between them.  One to rough it in, and at least one more to assure coverage and finish.
I would not use foam and drywall compound.  They are different from the material in the wall.  Also drywall compound may not be ideal in places like a basement, which might be more moist than the rest of the building.

How can I fill in an interior hole in a block wall?

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