How to Determine the Proper Insulation for Water Pipes

Proper insulation saves energy and keeps pipes from freezing.

Pipe insulation does more than keep pipes from freezing. It also can reduce energy costs and save water. An insulated hot water pipe, for example, reduces heat loss and raises water temperature by 2 to 4 degrees. This allows the water heater to be set at a lower temperature. It also reduces the time needed for hot water to reach the faucet, so less water is wasted during the wait. Before insulating pipes, however, it's important to determine the proper insulation to use.

Instructions

1. Measure the outside diameter of your cold and hot water pipes.

2. Purchase pipe sleeve insulation, available at home improvement stores, with an equivalent inside diameter to create a snug fit. Choose pipe sleeve insulation that can be sealed to prevent air infiltration.

3. Choose pipe sleeve insulation with a thick side wall for pipes located in an outside wall.

4. Select 1-inch thick fiberglass pipe wrap without facing for pipes that are within eight inches of a gas water heater flue.

5. Purchase polyethylene pipe insulation, which is not impacted by moisture, for underground pipes.

Tips & Warnings

• Avoid pipe insulation that contains formaldehyde, HCFCs and CFCs.

• Select pipe insulation that is fire retardant.

References

• Aerias: Insulation -- The Different Types and Their Advantages and Disadvantages
• This Old House: How to Prevent Frozen Pipes
• Energy Savers: Insulate Hot Water Pipes for Energy Savings

Resources

• Service Magic: Piping Problems and Proper Insulation