How to Install Pipe Insulation

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One of the easiest and most economical ways to protect copper water pipes from extreme temperature variations is to install rubber foam tube pipe insulation on all subfloor water lines. Pipe insulation is available in a variety of lengths to fit all standard piping sizes. The process can be completed in a few simple steps and helps protect plumbing lines from freezing, while improving temperature control for your household water supply.

Things You'll Need

  • Tape measure
  • Sharp knife or large scissors
  • Duct tape
  • Measure the length of water line to be insulated, using a tape measure.

  • Cut foam insulation to the needed length, using a utility knife or scissors. Spread the foam tube’s side seam opening and slip insulation over the pipe. Remove the paper strips covering the adhesive edges and press the edges together.

  • Cut a piece of foam insulation to approximately 8 inches long for angles in the piping. Spread the side seam and slip the piece over the straight pipe next to the angled fitting. Remove the paper strips from the adhesive edges and press together to seal. Grip the piece and slide it over the angle to center the angle in the piece. Continue insulation from both ends.

  • Wrap each joint where the pieces of insulation meet with a strip of duct tape to secure in place. The insulation should extend the full length of the exposed piping on both hot and cold water lines.

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