If you are using expanding nails hammer the nail until it is flush with the casing and tight to the wall.
How to put up a shelf on concrete wall.
Position the shelf supports so their holes line up with the wall anchors.
Turn the screws clockwise until they securely.
Mark every 24 inches along the line you made on the wall.
Step 3 mark every 24 inches.
Measure the whole length of the shelf.
Hold the bracket in a plumb position put down the level pick up a pencil and make a mark at the center of each of the bracket s screw holes.
Place a shelf bracket on the wall in the desired position.
Use the level to plumb the bracket.
Use a level to draw a line on the wall.
You will also need to mark the place you want your shelf to start from.
Measure the height for each shelf and mark it with a pencil.
Insert the screws into the holes of the support and then into the anchors.