How to Insulate 90-Degree Water Pipes


Insulation around your water pipes can prevent condensation and help save on your energy bills. When cold water flows through pipes installed in concealed spaces or basements, condensation forms on the outside. You do not want condensation dripping in your basement or on its walls, so insulating the pipes is a must. It also is good practice to insulate your hot-water pipes -- the water won't cool as quickly, which in turn reduces your energy consumption. Insulating a water pipe with a 90-degree may look tricky, but it just take a few quick cuts to do the job right.

Things You'll Need

  • 2-inch PVC pipe
  • Miter box
  • Tape measure
  • Utility knife
  • Place a length of 2-inch PVC pipe into a miter box. Cut this pipe at a 45-degree angle.

  • Slide a length of pipe insulation into the PVC pipe. Allow a few inches to protrude out of the end with the 45-degree angle. Cut the insulation tight to the PVC ends with your utility knife. Remove the insulation from the pipe.

  • Slide another piece of insulation into the PVC pipe. Cut it in the same manner as you did before. Remove the insulation.

  • Work one of the cut pieces of insulation around the 90-degree elbow in the water pipe. The short side should face toward the inside bend of the elbow and the long side should face toward the outside bend of the elbow.

  • Slide the other piece of pipe insulation around the elbow in the same manner. Notice how the two 45-degree angles meet up exactly and completely seal the 90-degree water pipe elbow.

  • Trim the other ends of the insulation as needed to meet up with the other insulation on the water pipe.

  • Remove the paper covering from the adhesive strips on the pipe insulation and press the seam together. This will seal the insulation around the pipe.

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