How to Soundproof a Car

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The key to soundproofing your car is understanding how sound gets from the engine to the inside of the car. Instead of traveling through the body of the car, sound comes in first through the hood, then through the windshield. The hood blocks very little sound and the windshield blocks even less. Applying a sheet of vinyl nitrile foam to the underside of the hood will drastically cut down on unwanted engine noise.

Things You'll Need

  • Vinyl nitrile foam mat
  • Contact cement
  • Old cloths
  • Rubbing alcohol
  • Knife
  • Electric meat carver
  • Butcher block paper
  • Pen
  • Pencil
  • Apply several pieces of tape to a sheet of butcher block paper.

  • Apply the paper to the underside of the hood, taking care to line it up, against the hood.

  • Cut out any sections blocking air filters or other necessary hood features with a knife.

  • Carefully trace the outline of the hood onto the paper with a pen or pencil.

  • Remove the paper.

  • Attach the paper to a piece of vinyl nitrile foam mat..

  • Use a sharp knife or an electric meat cutter to cut cut the mat to the shape of the paper.

  • Remove and discard the paper.

  • Clean the underside of the hood with a cloth and rubbing alcohol.

  • Cover the engine with a cloth to stop cement or debris from falling on it.

  • Spray contact cement on the underside of the hood and the piece of mat.

  • Carefully attach the mat to the underside of the hood.

Tips & Warnings

  • It helps to have a friend to hold the hood while you trace the paper and attach the foam. Alternately, you can remove the hood before you get to work.

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