Winter Freeze Checklist for Businesses in Prince George’s County

A winter freeze checklist for businesses should cover three things before the first hard freeze: the systems most likely to freeze, the people who know how to shut off water, and a plan for the first hour after a line bursts. Commercial buildings carry risks most homes don’t, including fire sprinkler piping, unheated loading areas, and suites that sit empty over the holidays.

Winter weather around Prince George’s County can range widely. National Weather Service records for neighboring Washington, D.C., include January temperatures as warm as 79°F and as cold as -14°F. Extreme temperature changes can catch a building before anyone has walked it. PuroClean of Lanham, MD put together this checklist for property managers, facility owners, and business owners who want to reduce freeze-related water damage this season.

Key Takeaways

• Sprinkler lines in unheated spaces, pipes along exterior walls, and loading dock areas are usually the first places to check.
• A pre-winter walkthrough should confirm heat, insulation, drainage, and access to every shutoff before temperatures drop.
• Tenants, after-hours staff, and security should know where the main water shutoff is and who is authorized to touch fire protection valves.
• In the first hour after a burst pipe, safety, stopping the water, and documentation come before cleanup.
• Vacant or lightly used suites need their own plan, because a leak there can run for days before anyone notices.

Which Commercial Systems Freeze First?

Water lines in spaces that lose heat first are the most likely to freeze. In commercial buildings, those spaces are often out of sight and visited only occasionally.

• Fire sprinkler piping. Wet pipe sprinkler systems hold water at all times, so any branch line running through an unheated stairwell, attic, parking garage, or exterior soffit is exposed. NFPA 13 calls for wet systems to be in areas kept at 40°F or warmer. Dry pipe systems are designed for cold areas, but condensation can collect at low points if they aren’t drained on schedule. A recent sprinkler system water damage project in Silver Spring shows how much ground a single sprinkler leak can cover.
• Pipes along exterior walls and above drop ceilings. Supply lines near the building envelope can freeze even when the occupied space feels warm.
• Loading docks and receiving areas. Dock doors open repeatedly, and nearby hose bibs, restroom lines, or sprinkler drops take the brunt of the cold air.
• Backflow preventers and irrigation lines. Exterior assemblies that aren’t drained or insulated before winter are a common source of early-season leaks.
• Rooftop and mechanical equipment. HVAC units with water coils, condensate lines, and makeup air units can freeze if dampers stick open or a unit shuts down.
• Vacant suites. Thermostats set back too far, or heat shut off entirely, can leave an entire tenant space at risk.

A Winter Freeze Checklist for Businesses: Your Pre-Winter Walkthrough

A walkthrough in late fall gives you time to fix problems before a cold snap forces the issue. Walk the building with your maintenance lead, and bring your fire protection contractor in for anything involving the sprinkler system.

Heat and Building Envelope

• Confirm heat is working in stairwells, vestibules, mechanical rooms, and any space with water piping.
• Check that dock doors, overhead doors, and exterior doors close and seal fully.
• Look for gaps, missing insulation, or damaged weatherstripping near pipe runs.
• Verify that HVAC freeze protection, low-temperature alarms, and building automation alerts are working and go to someone who will respond.

Plumbing and Fire Protection

• Have your fire protection contractor complete seasonal inspection items, including draining low points on dry pipe systems.
• Drain and shut off exterior hose bibs and irrigation lines, and protect backflow preventers.
• Insulate exposed supply lines in unheated or partially heated areas.
• Test that the main water shutoff valve turns and isn’t seized.

Vacant and Low-Occupancy Spaces

• Set a minimum heat level for vacant suites and confirm it with tenants who will be away over the holidays.
• Schedule regular walk-throughs of empty spaces during cold stretches.
• Consider water leak sensors or temperature sensors in spaces nobody checks daily.

Documentation

• Photograph the building’s current condition, including mechanical rooms and ceilings, so you have a baseline.
• Store insurance policy details, vendor contacts, and floor plans where after-hours staff can reach them.

If you manage a home as well as a commercial property, our winter home preparation guide covers the residential side.

Who Needs to Know Where the Shutoffs Are?

Everyone who might be first on the scene after hours should know how to stop domestic water, and who to call for everything else. That usually includes building engineers, property managers, security staff, cleaning crews, and key tenant contacts.

Two types of valves need different rules:

• Domestic water shutoffs. Label the main shutoff and any floor or zone valves. Post a simple map near each one, and keep photos in your emergency contact file.
• Fire sprinkler control valves. These protect the building and its occupants, so only authorized staff or your fire protection contractor should close them. Closing a sprinkler valve typically requires notifying your fire alarm monitoring company, and local requirements may apply while the system is out of service.

Keep a one-page contact list with your plumber, fire protection contractor, alarm monitoring company, insurance agent, and restoration company. Review it each fall, because contacts change. The same list will be useful again when heavy rain arrives, and our spring rain preparedness tips cover that next season.

What to Do in the First Hour after a Burst Pipe

A burst line in a commercial building can affect multiple floors, tenants, and operations within minutes. These steps help limit damage and protect people while help is on the way.

1. Put safety first. Keep people away from standing water near outlets, panels, or equipment, and watch for sagging ceilings.
2. Stop the water. Close the nearest domestic shutoff. If the leak is from a sprinkler line, contact your fire protection contractor and alarm monitoring company rather than closing valves without authorization.
3. Notify the right people. Alert affected tenants, building management, and your insurance agent.
4. Protect what you can. Move inventory, records, and portable equipment away from the water if it is safe to do so.
5. Document everything. Take photos and video of the damage, the source, and affected contents before cleanup starts.
6. Call a restoration professional. Water moves into walls, ceilings, and flooring quickly, and fast drying reduces the chance of secondary damage such as mold growth.

Even after the leak stops, moisture left in materials can cause problems that aren’t visible right away. Our article on the hidden dangers of water damage explains what to watch for.

Get Help with Winter Freeze Damage at Your Commercial Property

A freeze checklist lowers the risk, but it can’t remove it. If a pipe or sprinkler line bursts in your building, PuroClean of Lanham, MD provides commercial water damage restoration for businesses and property owners in Prince George’s County. The PuroClean of Lanham Team can extract water, dry affected materials, and document the damage to support your insurance claim.

If winter weather affects more than one property or causes wider damage, learn more about our commercial storm and disaster recovery services.

Contact PuroClean of Lanham, MD or call (301) 277-2755. 

Frequently Asked Questions

How Cold Does It Have to Be for Pipes in a Commercial Building to Freeze?

There is no single temperature. Freezing depends on how long the cold lasts, wind exposure, insulation, and whether heat reaches the pipe. Lines in unheated or exterior spaces can freeze during a cold snap even when the rest of the building stays comfortable.

Should We Shut Off Water to a Vacant Suite over the Holidays?

Shutting off and draining domestic water to an empty suite can reduce risk, but keep the heat on at a safe minimum. Never close fire sprinkler valves to an occupied building or tenant space without your fire protection contractor and alarm monitoring company involved.

Does Commercial Property Insurance Cover Frozen Pipe Damage?

Coverage depends on your policy and the circumstances. Some policies include conditions related to maintaining heat or draining systems in vacant buildings, so review your policy with your agent before winter.

What Should We Have Ready before Calling a Restoration Company?

Have the property address, the source of the water if known, which areas and tenants are affected, and your insurance information. Photos taken before cleanup are also helpful. These details help a water damage restoration team plan the first visit.