Plug with Hydro Cement from both sides. You will have to make the first batch stiff enough that it can still be packed into the hole, but not loose enough that it falls apart and drops into the cavity. The last layer, you just smooth over with either a trowel, or wide blade drywall knife.
Concrete block hole
I have a hole in a concrete block in my basement. The hole is from previous A/C lines. Would like to patch this but I am really not sure of the best method. Using the right mortar, would it be a matter of filling the hole in half way first (like a half moon) and then finishing off with a second layer? Hole is about 4inches in diameter.
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I am not sure why the house was built like it was and why there is an offset as cluthcargo asked. This area is specifically in the crawlspace. I have included a couple more pics for more clarity since there seems to be some curiosity to the oddness of it all.
I have had the house for three years. House was built in '64.
You will notice the open "tops" of one row there. In all of the holes, I had put in great stuff foam because there was a lot of cold air leaking into the house. I actually filled the hole with FG batting first then foamed. I had to redo a lot of the brick joint because they were getting bad and allowing air to leak in. It was pretty cold in the crawlspace a couple winters ago. Currently in the process of insulating it all but that is another story for another day. Small gaps are pretty easy to fix with bag mortar. When there is a hole that is 4" across, the approach needs to change.
Just to clarify a bit more: The hole does exist on both sides but the exterior side is still ok for now. Eventually I will do that one but it will be later. Develop my technique here and then do it out there. BTW, just dumping concrete from the top may work but the hole is pretty deep because it channels into other blocks.
I have had the house for three years. House was built in '64.
You will notice the open "tops" of one row there. In all of the holes, I had put in great stuff foam because there was a lot of cold air leaking into the house. I actually filled the hole with FG batting first then foamed. I had to redo a lot of the brick joint because they were getting bad and allowing air to leak in. It was pretty cold in the crawlspace a couple winters ago. Currently in the process of insulating it all but that is another story for another day. Small gaps are pretty easy to fix with bag mortar. When there is a hole that is 4" across, the approach needs to change.
Just to clarify a bit more: The hole does exist on both sides but the exterior side is still ok for now. Eventually I will do that one but it will be later. Develop my technique here and then do it out there. BTW, just dumping concrete from the top may work but the hole is pretty deep because it channels into other blocks.
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