- 1). Mark the location of the hole with a crayon on the interior and exterior concrete wall surface. Allow a minimum of 1-inch around the perimeter of the pipe and keep the top edge of the hole's circumference a minimum of 3-inches from the top of the foundation wall and wood sill plate.
- 2). Begin the hole cutting on the interior wall using a circular saw equipped with a masonry blade to score the hole diameter a minimum of ½-inch deep, and making incremental plunge cuts that overlap at the corners no more than 1-inch.
- 3). Reset the circular saws cutting depth and repeat the cutting to extend the cut depth to approximately 1-inch deep.
- 4). Chip away the concrete within the hole location. Break the concrete away, working from the edge to the center of the hole to a depth approximately halfway through the wall or until a steel reinforcing bar is encountered. Use a small sledge hammer and cold chisel to help break away the pieces of concrete as the chipping hammer loosens them.
- 5). Go to the exterior wall and repeat Steps 2 through 4, until the hole has penetrated through the wall. Chip the perimeter surfaces to open the hole to the full diameter, exposing the reinforcing bar to the edges of the hole's diameter.
- 6). Cut the reinforcing bar from the opening, if applicable, with a reciprocating saw equipped with a metal cutting blade.
- 7). Use the sledge hammer and cold chisel to clean up the surfaces of the opening to allow the piping to pass freely through the hole.
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