Concrete block walls provide a unique challenge to hanging mirrors, because you cannot simply nail or screw into them. Instead, you must use specialized expansion anchors, which expand when you insert a screw. This expansion causes the anchor to hold tight to concrete. Once the anchors are in place, the process becomes the same as hanging a mirror on any other wall, though you must use screw-in brackets instead of those with nails.
Step 1
Hold the mirror against the wall in the location where you want to hang it. Use a level to ensure that the top of the mirror is perfectly horizontal.
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Step 2
Draw a line along the top and bottom of the mirror with a pencil.
Step 3
Select plastic expansion anchors that fit the screws included with the mirror mounts. The screws should be able to screw snugly into the anchors.
Step 4
Drill four holes in the wall with a masonry bit that is slightly smaller than the diameter of the anchor. These holes should be positioned at the four corners of the mirror, 2 inches in from the sides. Drill them on the outsides of the lines so the mirror does not cover them.
Step 5
Insert expansion anchors into the holes. Tap them with a hammer if required to push them all the way in.
Step 6
Screw the mirror brackets halfway into the anchors.
Step 7
Have a partner hold the mirror against the wall while you swivel the brackets over the mirror. Finish tightening them, securing the mirror against the wall.