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Opening hole in concrete wall.
Drill through each corner of your cutout using a rotary hammer equipped with a masonry bit.
Correct placement of the rebar helps prevent the concrete around openings from cracking from structural loads or shrinkage.
Steel reinforcing bar around openings is a critical structural element of cast in place concrete walls whether they are built with removable forms or insulating concrete forms icfs.
Until now i just figured they weren t ready to knock it out.
You want the concrete surface in each hole to be perfectly clean.
Just before filling each hole with the expanding concrete repair product use an old spray bottle and spritz the hole with a spray.
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.
Clean the hole and surrounding area with a wire brush.