I had a bunch of empty cardboard boxes cluttering up the garage. So a few days ago I cut them all down and went to recycling with them.
Guess what? Today i needed one of them.
I am removing a dryer vent that is not used anymore. (moved vent to another
spot). Removing the vent leaves a 4 inch diameter hole in the poured concrete
wall. What would be the correct way to fill this hole in? Thankyou for your help.