Bending aluminum flashing requires the use of the proper tools and techniques to avoid damaging the metal. Here are some steps to follow:

  1. Determine the angle of the bend: Use a protractor or angle finder to measure the angle of the bend needed.

  2. Choose the right tools: You will need a bending brake or a sheet metal bender, which can be found at most hardware or home improvement stores. You may also need pliers or a vice to hold the aluminum in place.

  3. Cut the aluminum flashing to size: Measure the length of the aluminum you need and cut it using tin snips or a metal cutting blade on a saw.

  4. Position the aluminum in the bending brake: Place the aluminum in the bending brake and align the bend line with the brake's bending edge.

  5. Apply pressure: Use the bending brake to apply pressure to the aluminum to create the desired bend.

  6. Check the bend: Remove the aluminum from the bending brake and check the bend for accuracy.

  7. Repeat: Repeat the process as necessary until you have achieved the desired shape.

Remember to wear gloves and safety glasses when working with metal, and be careful not to apply too much pressure or force to avoid damaging the aluminum.