Frozen Pipe Burst Cleanup in Northern Virginia

Why frozen pipes split

Water expands as it freezes. In a pipe, the ice forms a plug, and as more water freezes behind it, pressure builds in the section between the ice and the closed faucet. That pressure, not the ice itself, is what splits the pipe, often at a point some distance from where the ice formed. Copper tends to split lengthwise; plastic lines can split or pop their fittings.

While the pipe stays frozen, the ice holds the water back. The leak begins as the ice melts, which might be the next afternoon, or days later when the cold snap breaks. By then the split is often hidden inside a wall, above a ceiling or in a crawl space, and water runs at full pressure until someone notices.

What people notice

• No water, or only a trickle, from a tap on an exterior wall during deep cold.
• Frost on an exposed pipe in a basement, crawl space or garage.
• A sudden sound of running water as the weather warms.
• Water coming from a ceiling below a bathroom on an exterior wall.
• Water running out of the siding or foundation near an outdoor faucet.

Property managers often find freeze damage in units that were empty between tenants with the heat turned right down. Building engineers may see it in sprinkler lines or supply lines in unheated stairwells, parking garages and mechanical spaces.

Where pipes freeze in Northern Virginia homes

The Mid-Atlantic isn't consistently cold, which is part of the problem. Homes here aren't always built with freeze protection in mind, and a few nights well below freezing each winter catch out plumbing that was fine the rest of the year. The usual places:

• Exterior walls. Kitchen and bathroom supply lines on outside walls, especially in older homes with little insulation.
• Crawl spaces. Vented crawl spaces let cold air reach pipes directly.
• Garages. Laundry hookups and water heaters in attached garages, and supply lines passing through garage ceilings to rooms above.
• Outdoor faucets. A frost-free sillcock can still freeze and split inside the wall if a hose is left connected, because water can't drain out.
• Cantilevered floors and bump-outs. Rooms that overhang the foundation often have pipes in cold floor cavities.
• Vacant and seasonal properties. Homes and units left with heat off or very low, and rural properties where outbuildings have water lines.

Thawing a frozen pipe: what to do and what to avoid

If you know which pipe is frozen and you can reach it, the steps are simple. Open the faucet it feeds, so melting water has somewhere to go and pressure is relieved. Warm the pipe gently, starting from the faucet end and working back toward the ice, with a hair dryer, a heating pad or warm towels. Keep going until full flow returns, then check the pipe along its length for drips.

What to avoid: open flames, torches and heat guns, which can scorch wood, melt plastic pipe and fittings, and start fires inside walls. Space heaters left unattended near stored items or combustible materials. And don't thaw a pipe you can't see or reach. If it's inside a wall or ceiling, you won't know whether it has split until water appears, so close the main first and call a plumber.

The first hour after a freeze leak

Close the main, open a low faucet to drain pressure, and turn down the water heater if the main will be off for a while. Move belongings out of the way and photograph the damage and, if it's visible, the split. A plumber repairs the pipe; the restoration crew handles the water.

In a condominium or apartment building, tell management or the building engineer, since freezes in shared spaces or risers can affect several units. Landlords and property managers dealing with a vacant unit should arrange access for both the plumber and the crew. Contact your own insurer as well. What applies depends entirely on your individual policy and the circumstances.

How freeze damage is cleaned up

1. Confirming the supply is off and that no other pipes in the same cold area have split.
2. Mapping the water. Freeze leaks often start inside exterior walls or above ceilings, so meters and thermal imaging check both sides of the wall and the floors below.
3. Extraction of standing water from floors, carpet and pad.
4. Opening cavities. Wall and ceiling cavities where the split occurred are usually opened already for repair. Insulation that got wet is removed.
5. Drying in cold conditions. Winter air is dry, which helps, but cold spaces slow evaporation and can make standard dehumidifiers work poorly. Crews may add heat or use desiccant dehumidifiers in crawl spaces and garages.
6. Monitoring until readings match dry references, then records of the work.

What affects time and cost

Freeze leaks often run longer before discovery than other pipe failures, because they start when nobody is watching. The duration of the leak, how many rooms and levels it reached, and whether it happened in a finished space all shape the job. Crawl spaces and cold garages need their own drying setup.

Before any work starts, you get a clear price for the scope, and nothing is added without your agreement.

Afterward: getting through next winter

• Disconnect hoses from outdoor faucets before the first freeze, and close any interior shut-off valves that feed them.
• Insulate pipes in crawl spaces, garages and exterior walls, and seal gaps that let cold air reach them.
• On the coldest nights, open cabinet doors on exterior walls and let a vulnerable tap drip.
• Keep vacant units and homes heated to a steady minimum, and check them regularly.
• Consider a leak-detection shut-off valve or a low-temperature alarm for properties left empty.

Related services

• Burst pipes
• Vacant units
• Leaks behind walls
• Ceiling water damage
• Rental properties
• Structural drying

Frozen pipes: common questions