Anyway the landord was adding an overhead door for the next tenant and the concrete cutters came in one morning anchored tracks to the wall and ran the rail saws in about 8 hours they had a 12 ft overhead door cut but like above left the concrete in the hole.
Opening hole in concrete wall.
Drill through each corner of your cutout using a rotary hammer equipped with a masonry bit.
Just before filling each hole with the expanding concrete repair product use an old spray bottle and spritz the hole with a spray.
Correct placement of the rebar helps prevent the concrete around openings from cracking from structural loads or shrinkage.
Steel lintels in concrete block walls are placed in the mortar between blocks so the first step will be opening a space for the lintel itself.
Remove loose material from the hole in the wall by probing it with the tip of a screwdriver or blade of a putty knife.
5 line up the blade of a.
Clean the hole and surrounding area with a wire brush.
Until now i just figured they weren t ready to knock it out.
These holes will mark the boundaries of the opening and help guide your cuts.