Insulate Water Lines In The Winter To Prevent Frozen Pipes

Any exposed water main or water line should be insulated during the Winter season to prevent frozen pipes, and needless emergency plumbing repairs. The same applies to a water line in an unheated environment, such as a vacation house. Even a buried NYC water main less than 3 1/2′ deep should be insulated from freezing and frost.

Insulating is not a complicated process at all, but it depends on the particular circumstances and where the water line is located. Naturally if a property is unoccupied, and does not require heat or water, the best solution is to close and drain the water from the plumbing system during the Winter.

frozen water line

Burst and frozen water line

Prevent Frozen Pipes In Unheated Buildings

A water line or water main above ground level in an unheated property needs to be protected. This is frequently the case in new buildings (where all utilities may not be installed yet), vacation homes, and warehouses. Vacation homes in particular pose a problem, because a burst pipe may go unnoticed for months, creating severe damage.

Typically regular fiberglass house insulation can be carefully wrapped around any exposed water pipe to prevent freezing. If the water line is present next to the house sewer, the sewer line also provides some heat. Therefore it is best to include the sanitary sewer drain inside the wrapping.

water line insulation

Felt Insulation

Felt insulation is specifically designed to prevent frozen pipes that are underground. That is because unlike typical household insulation, felt does not compress once buried. Therefore it maintains it’s insulating properties.

Prevent Frozen Exposed Water Lines

Any water line exposed to the elements needs extra protection. In addition to applying additional layers of insulation, the insulation itself should be plastic encased to ensure it is waterproof. If an electrical connection is available ‘heat trace’ wiring can be easily installed to provide heat from an electrical source for added ‘peace of mind’.

prevent frozen pipes

Heat Trace Wire Wrapping

Prevent Frozen Shallow Water Mains

Curb box

Inside of a curb valve operating box

Even a buried water main can be prone to freezing if it is not at least 3 1/2′ deep, or if it is close to a gas main. A water main, no matter what time of year it is installed, must be at least 3 1/2′ feet deep in NYC to be below the frost line and to meet code. Any main water line less than 3 1/2′ deep must be insulated with special hair felt insulation that will not compress, and then waterproofed.If the water service line is installed correctly, even a shallow NYC main line will not freeze in the coldest Winter.

Inside Of A Curb Valve Box

Prevent Frozen Pipes In Unoccupied Properties

In cases where a reliable curb valve is present in the sidewalk area the water can be closed to the property as a 1st step. The 2nd step would be to disconnect the inside plumbing. Then to open the main valve with the water off, and let the water drain out, so no water is left inside any of the plumbing to freeze. This would prevent damage to any part of the water supply system for the house.

Please note that no special tools or expertise are required to perform any of this work. Important to note is that frequently damage will not be apparent until after a frozen pipe thaws. That is when water will come rushing out from frozen and split plumbing. So remember to inspect your plumbing after a freeze, and well before a thaw.


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Balkan Plumbing is the largest sewer and water main company in NYC. For over 60 years, our family's 10 year guarantee* means we stand by our work long after the job is done. For sewer and water main issues throughout Brooklyn, Queens, Manhattan, and the Bronx contact Joseph L. Balkan, Inc. today for 24/7/365 service. Paul R. Balkan, NYC Licensed Master Plumber 01281

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