Insulating water pipes is a key element to any efforts towinterize the plumbing in the home.

When preventing freezing is the goal, insulate both the hot- and cold-water pipes.

Hot water pipes can also freeze unless water is actively running through them.

Water supply copper pipe insulated with pipe-wrap

The Spruce / Kevin Norris

When exposed cold pipes contact warm, humid air, condensation can form on the pipes.

Insulating the cold water pipes can prevent this condensation.

There are several strategies you’ve got the option to use to insulate water pipes.

Materials and tools to insulate water supply pipe

The Spruce / Kevin Norris

We’ll talk about insulation it’s possible for you to apply directly to the pipes.

Before You Begin

When selecting water pipe insulation, consider the R-value of the various options.

R-value is a measurement that quantifies the resistance to heat flow of a given material.

Copper water supply pipe wrapped in duct tape with insulation strip

The Spruce / Kevin Norris

The higher the R-value, the greater the insulating power of that material.

The R-value may not be displayed on pipe insulation, so you may need to do a little research.

The colder your climate, the higher the R-value you should look for when choosing pipe insulation.

Insulation wrapped around copper water supply pipe in spiral loops

The Spruce / Kevin Norris

Remove any dirt or grease from the pipes before insulating.

Any kind of moisture can cause the insulation to come loose.

Duct tape or self-sealing strips on the insulation may come loose over time and expose parts of the pipe.

Insulation strip wrapped around copper water supply pipe to ends

The Spruce / Kevin Norris

If the pipes are not completely covered, reseal those areas before winter temperatures drop.

Completely cover the pipe, taking care not to leave any areas exposed.

Finish Wrapping

Tape the end of the insulating strip in place.

Foam pipe sleeves positioned length-wise around water supply pipe

The Spruce / Kevin Norris

The sleeves can be made of either foam or rubber insulation, and both are available in self-sealing styles.

Different diameters are available for different pipe sizes: 1/2-, 3/4-, and 1-inch.

Installing foam sleeve pipe insulation is one of the simplest of all insulation options.

Foam pipe sleeve sealed with self-adhesive strip over water supply pipe

The Spruce / Kevin Norris

Slide the sleeve over the pipe; the slits will close up around the pipe.

If necessary, continue with the next sleeve, butting it against the end of the previous sleeve.

If the pipe is turning a corner, you might miter-cut the sleeves to fit around the corner.

Foam tube sleeve cut with utility knife

The Spruce / Kevin Norris

Or, use pipe-wrap to cover the fittings at corners, taping them to the foam sleeves.

When the installation is completed, also tape the butt seams where two sleeves meet.