Pull the washing machine away from the wall a few inches to give yourself easy access to the drain pipe. Measure the length of the drain pipe and jot down the number. Bring this number with you to the hardware store or home improvement center.
Locate a piece of foam pipe insulation sleeve that closely matches your measurement. Don’t worry if the pipe insulation sleeve is too long.
Cut the piece of foam pipe insulation to fit the drain pipe, using a sharp knife or scissors. Wrap the pipe insulation sleeve over the drain pipe, with the seam facing down.
Wrap both ends of the insulated drain pipe with acrylic tape. Place additional pieces of acrylic tape around the insulated pipe every 3 to 4 inches.