- 1). Set up the two sawhorses five-feet apart and parallel to each other and place the four-foot by eight-foot piece of 5/8-inch plywood across the sawhorses.
- 2). Pull a length of aluminum flashing onto the 5/8-inch plywood.
- 3). Stretch the tape measure along the length of aluminum flashing and mark the length that you need to cut the aluminum flashing with the carpenter's pencil. Make a second length mark along the other edge of the aluminum flashing.
- 4). Align the straightedge with the two length marks you placed on the aluminum flashing in the last step.
- 5). Rest the blade of the utility knife on the side of the straightedge aligned with the length marks, just off the side of the aluminum flashing.
- 6). Pull the utility knife toward you while applying excessive pressure toward the surface of the 5/8-inch plywood. Make sure that you make one pass over the aluminum flashing with the utility knife.
- 7). Remove the straightedge from the surface of the aluminum flashing and pull the loose end of the aluminum flashing toward the score line until the aluminum flashing snaps.
- 8). Lightly tap the cut of the aluminum flashing with the rubber mallet to flatten the cut end of the aluminum flashing to complete the cut.
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