Winter storms arrive on their own schedule, and a commercial building has a lot more to protect than a house does. There is the roof, the parking lot, the loading dock, the sprinkler lines, the tenants, the stock and the people who walk through the front door every morning. When a storm hits, every one of those pieces gets tested at once.
The good news is that most winter damage follows predictable patterns. Clogged drains, tired seams, frozen pipes and unplanned snow removal cause a large share of the problems building managers deal with each season. A building that has been walked, checked and documented before the first heavy snowfall tends to get through the season with fewer surprises. This checklist takes you through the roof first, then the rest of the property, then the plan for storm day itself.
Why Winter Preparation Starts Months Before the First Storm
The best time to prepare is early autumn, while the weather still lets a crew work safely on a roof and while contractors have open calendars. Once the first cold snap arrives, repair schedules fill up, adhesives and sealants cure more slowly, and a small fix that could have been done in an afternoon turns into a temporary patch that waits for spring.
Think of preparation as three layers. The first layer is the building shell: roof, walls, windows, doors and dock seals. The second layer is the systems inside: heating, plumbing, fire protection and electrical. The third layer is the site: lots, walks, lighting and access routes. Each layer has its own checks, and each one can be assigned to a person with a due date. A shared document with names and dates beside every line does more for winter readiness than any amount of good intentions.
Walk the Roof Before Snow Covers It
A roof inspection is the single most valuable step on the list. Snow hides problems, and once it covers the surface, you cannot see ponding, split seams or loose flashing until the thaw reveals them as leaks. A visual walk in autumn gives you a clean record of the roof’s condition and a short list of repairs to finish before winter.
During the walk, look for these things:
- Standing water that remains more than a day or two after rain, which signals low spots or blocked drainage.
- Blisters, wrinkles or splits in the membrane, especially near seams and corners.
- Loose, lifted or cracked flashing at walls, parapets, curbs and pipe penetrations.
- Worn or missing sealant around rooftop equipment supports.
- Debris such as leaves, tools, packaging or old filters left behind by service crews.
Take dated photographs of every area as you go. Those images help you compare conditions year over year, and they support an insurance claim if storm damage occurs later. Roof access should be limited to trained people with proper fall protection. If your own staff are not set up for that, have a roofing professional perform the inspection.
Clear Every Drain, Scupper and Downspout
On a low-slope commercial roof, drainage is the difference between a roof that sheds meltwater and a roof that holds it. When snow melts during the day and refreezes at night, water that cannot reach a drain turns into ice. Ice expands, and it pushes against seams, flashings and the edges of the membrane.
Clear leaves and debris from roof drains, overflow scuppers, gutters and downspouts. Check that strainers are in place and that overflow openings are not blocked by insulation, sealant or stored materials. Run water into a drain if you are unsure whether it flows, and watch where it goes. A slow drain in October is a frozen drain in January.
Do not forget the ground end of the system. Downspouts that discharge onto a walkway or a loading area can create an ice patch exactly where people travel. Extend or redirect them where possible so meltwater moves away from foot and truck traffic.
Check Seams, Flashings and Penetrations
Water finds the smallest opening, and winter makes openings bigger. Each cycle of freezing and thawing pries at a lifted seam or a cracked sealant joint a little more. The places that deserve extra attention are the ones where the roof meets something else: parapet walls, curbs, vents, pipes, skylights and rooftop unit supports.
Look at flashing laps, termination bars and counterflashing. Look for sealant that has hardened, shrunk or pulled away from its surface. Check the membrane near fasteners for signs of backing out. Small repairs at these points are quick and inexpensive compared with the cost of replacing wet insulation after a winter of slow leaks.
If your building has a roof that has been patched several times, ask for a condition assessment rather than another patch. A written report gives you a basis for planning repair, restoration or replacement in your budget cycle instead of reacting under pressure.
Know Your Roof Type and What It Needs in Winter
Different roofing systems respond differently to cold weather. Single-ply membranes such as EPDM, TPO and PVC rely on sound seams and well-attached flashings. Modified bitumen and built-up roofs rely on intact surfacing and sealed laps. Metal roofs depend on tight fasteners, healthy sealants and unobstructed snow movement. Coated roofs depend on a continuous, well-bonded film over a sound substrate.
Whichever system you have, find out its age, its installation date and whether a warranty is still active. Warranty terms often require documented maintenance, and an autumn inspection report is exactly the kind of record that supports a claim. Keep these documents in one folder where your facilities team, your property manager and your roofer can all find them.
Understand Snow Load and Drainage on Older Roofs
Snow has weight, and wet snow weighs more than powder. A roof is designed for a certain load, but older buildings often have roofs that have gained a second layer, added insulation or new rooftop equipment over the decades. Each addition changes how the roof carries weight and moves water.
Local climate figures help frame the risk. For buildings in a market like Detroit, National Weather Service normals for 1991 to 2020 show roughly 45.6 inches of snow in an average year, with January and February as the heaviest months. A flat roof in that climate can hold snow for weeks, melting a little each afternoon and refreezing overnight. That cycle stresses every weak point. Owners looking at commercial roofing in Detroit will find that the same pattern shapes how roofs are detailed, drained and maintained across the whole region.
If you see ceiling sagging, doors that suddenly stick, or new cracks in interior walls during a heavy snowfall, treat it as urgent. Clear the area, call a structural professional and avoid sending staff to the roof to shovel. Snow removal from a roof is specialized work and should be handled by trained crews who know how to protect the membrane.
Plan for Ice Dams and Freeze-Thaw Damage
Ice dams form when heat escaping from the building warms the roof surface, melts the snow above, and lets the meltwater run down to a colder edge where it refreezes. The ice builds up and traps water behind it. That water can back up under flashing or membrane edges and show itself as a leak inside, often far from the cause.
Prevention comes from managing heat loss and drainage. Check that insulation is continuous and dry, that rooftop penetrations are sealed against warm air leaks, and that edges and gutters can shed water. Where an ice dam has already formed, do not chip at it with tools, which can cut the membrane. Call a professional who can steam or manage it safely.
Secure Rooftop Equipment and Access Points
Rooftop units, exhaust fans, antennas and solar equipment are all part of the winter plan. Panels should be latched, so wind cannot pry them open. Condensate lines should be insulated or heat traced where they might freeze. Curbs should be sealed and flashed, and unit supports should be checked for loose hardware.
Roof hatches and access ladders also need attention. Make sure hatch gaskets seal, hatch hardware works in cold weather, and ladders are free of rust. A hatch that leaks warm air or lets in snow is a frequent source of winter condensation and ice. Schedule HVAC service before the cold sets in so crews do not need to traverse a frozen roof in the middle of the season, which can damage the membrane and put workers at risk.
Inspect Walls, Windows, Doors and Dock Seals
The roof gets the most attention, but wind-driven snow finds its way through every gap in the envelope. Walk the perimeter and check caulking around windows and door frames, weatherstripping at entrances, and the seals and shelters at loading docks. A gap that looks small on a warm day lets in a lot of cold air during a storm and raises heating costs for the whole season.
Check exterior doors for smooth operation. Automatic doors should open and close fully without catching, and their sensors should be clean. Overhead doors should seal against the floor. Any door that jams in winter can become an emergency exit problem or leave the building exposed during a storm.
Protect Plumbing, Sprinklers and Heating Systems
Frozen pipes can cause as much disruption as a roof leak. Identify lines that run along exterior walls, through unheated spaces or above ceilings in areas with poor insulation. Add insulation or heat tracing where needed, and make sure unoccupied areas stay above a safe minimum temperature rather than being shut down completely.
Fire protection systems need particular care. Dry-pipe sprinkler systems should be tested and drained of trapped water, and wet systems in cold spaces should be checked for freeze protection. Ask your fire protection contractor to complete their seasonal inspection before the cold arrives, and keep a record of it.
Have the heating system serviced in autumn. Replace filters, test thermostats, check boilers and make sure backup heat is ready. If the building has a generator, run it under load, check fuel levels and confirm that the transfer switch works. A power loss in a winter storm is far easier to manage when the backup system has recently been tested.
Organize Snow and Ice Management on the Grounds
Parking lots, sidewalks and entrances create the highest liability exposure in winter, because most injuries happen on slippery surfaces. Decide in advance who plows, who salts and what triggers a visit. A written contract should define the snow depth that starts service, the areas covered, the response time and how piles are placed so they do not block drains, fire lanes or sight lines.
Mark curbs, bollards, hydrants and drain covers with tall stakes before the ground freezes, so plow operators can see them under snow. Stock enough ice melt or sand for staff to treat entrances between visits. Keep a simple log of when service was performed. Those records matter if someone files a claim after a fall.
Snow piles deserve a plan of their own. Large piles placed against a building wall can melt into the foundation or against doors, and piles near catch basins can cause flooding when temperatures rise. Choose pile locations that drain away from the building and away from traffic.
Trim Trees and Check Lighting, Signs and Fences
Heavy snow and ice load branches, and branches fall on roofs, vehicles and power lines. Trim trees that hang over the building or the parking area while the weather is still dry. Remove dead limbs and look at the trees closest to utility connections.
Test exterior lighting before the early darkness of winter. Replace failed bulbs, check photocells and make sure emergency lighting works. Check that signs, banners and awnings are firmly anchored. Loose fencing or screening can become wind-borne debris, so secure or remove anything that might move in a strong gust.
Build a Storm Response Plan Your Team Can Follow
A written plan removes guesswork when the weather turns. It should list who is in charge during a storm, who makes the decision to close or delay opening, how tenants and staff are notified, and who calls which vendors. Include phone numbers for your roofer, plumber, electrician, HVAC service, snow contractor, restoration company and insurance agent. Print it, and store a digital copy somewhere that does not depend on the building’s power.
Decide which areas need priority protection. Server rooms, inventory, records and sensitive equipment should have plastic sheeting, bins and a protocol for moving items out of harm’s way. Staff should know where shutoff valves, electrical panels and sprinkler controls are located. A short walkthrough with the team each autumn takes less than an hour and pays off the first time something goes wrong.
What to Do When a Leak Appears During a Storm
Even a well-maintained building can develop a leak in severe weather. The first goal is safety. Move people away from the wet area, keep clear of electrical equipment, and shut off power to any circuit that water might reach. Move stock and equipment out of the drip zone and cover what cannot be moved. Contain the water with buckets or bins, and use plastic sheeting to direct it.
Photograph the leak, the ceiling and any damaged property before anything is cleaned up. Note the time, the weather and what was happening on the roof. Do not send staff onto an icy roof to look for the source. The entry point is often some distance from the stain, and tracing it takes tools and training.
This is the moment to call a roofer that answers at any hour. Having the number of a provider of 24/7 emergency commercial roof repair in your storm plan means the building gets a temporary seal quickly, and the permanent repair can be planned once the weather clears. Keep that number near the phone and in the shared contact sheet before you need it.
Inspect Everything After the Storm Passes
When the weather clears, walk the site before it returns to normal operation. Look at ceiling tiles, corners near exterior walls, and the areas below rooftop equipment for stains or damp spots. Check the exterior for damaged siding, loose fixtures and debris. Check the parking lot for drainage problems as the snow melts.
Arrange a roof inspection after any significant storm. Wind can lift membrane edges, ice can displace flashing and falling branches can puncture the surface, and none of this is always visible from the ground. A post-storm check catches small damage while it is still a small repair. Keep photographs and written notes together with the earlier autumn records, since the comparison supports insurance documentation.
Choosing a Roofing Partner Before You Need One
The best time to meet a roofer is before an emergency. A contractor who has already seen your roof knows its layout, its drains, its history of repairs and where the hazards are. That familiarity speeds up every response and makes recommendations more accurate.
When comparing contractors, ask whether their own crews do the work, whether they offer maintenance programs, and how they handle emergencies. A commercial roofing contractor based in Livonia, MI is one example of a regional company that works across metro Detroit and offers inspections, repair, restoration and replacement for low-slope and metal systems. Whichever company you choose, ask for a written inspection report with photographs and priorities, so you can budget repairs sensibly across seasons.
A Simple Winter Readiness Timeline
Breaking the work into a timeline keeps it manageable. Use the following as a starting point and adjust it for your building.
- Early autumn: schedule the roof inspection, clear drains and gutters, trim trees, service heating and book HVAC and fire protection checks.
- Mid autumn: complete repairs found in the inspection, seal gaps around windows, doors and docks, insulate vulnerable pipes and sign the snow removal contract.
- Before the first forecast storm: stake curbs and drains, stock ice melt, test the generator, brief the team and confirm the vendor contact list.
- During the storm: monitor the building, follow your response plan and call for help early if a leak or power loss occurs.
- After the storm: walk the interior and exterior, document findings, schedule a roof check and log any repairs.
Turning the Checklist into a Habit
The buildings that handle winter well do the same things every year. They inspect in autumn, fix small problems early, keep drains open, test their systems and write down who does what when the weather turns. None of these steps is complicated, and together they reduce the chance that a storm turns into a long and expensive disruption.
Start with the roof, because it protects everything beneath it. Then work outward through the envelope, the systems and the grounds. Assign each task, set a date and keep your records in one place. With that groundwork finished, a winter storm becomes a weather event your team has planned for, and the building can keep serving its tenants, customers and staff through the coldest months.