Snow is the cost driver across Coeur d'Alene commercial roofing, and the damage it does is mostly predictable. The city's 60 psf snow design, severe weathering rating and required ice barrier underlayment tell you where the money goes: drift pockets, drains and edges. A roof that is damaged by snow and ice is almost always damaged in one of those places.
We find which one, price the repair by line and separate what the winter broke from what it exposed. The owner decides what goes back as it was and what gets upgraded.
The Call: Load, Ice or Water
Snow damage comes in three kinds. Load damage is structural: deflected deck, bent purlins, cracked insulation and crushed rooftop supports. Ice damage is at the edges and low points: ice dams, torn gutters, lifted edge metal and membrane pulled by ice at the eave. Water damage comes after both: leaks at seams, flashing and penetrations opened by freeze and thaw.
We sort what we see into those kinds on the first walk and put the structural findings first. If the deck has deflected, the engineer decides before any roofing is priced. If the damage is ice at the edge, the fix is edge metal and attachment. If the damage is water entry, it is a flashing or seam repair with the cause proven. Mixed cases are common, and the scope lists each part on its own line.
What It Costs: Structure First, Surface Second
The expensive line in a snow damage repair is structure. Replacing a bent purlin, shoring a sagging bay or re-fastening a deck costs more than the roof covering over it, and it comes first. After that, the surface repairs follow: membrane patches, edge metal, flashing, gutters and wet insulation. Each has its own unit price.
Ice damage costs are often small but repeat. A torn gutter replaced with the same gutter will tear again next winter, so we price the heavier gutter, closer hangers and snow guards as alternates. A roof that develops an ice dam at the same eave each year has a heat or air leak under it, and the fix may be in the insulation and ventilation, not in the roof covering. A re-insulation and cover board option is priced beside the repair, so the owner can see the cause and the cost to remove it.
What the Code Sheet Says: Numbers Worth Knowing
Water content in snow can swing from about 1 percent to 33 percent, and saturated snow comes in near 20 pounds a cubic foot. At that weight, a foot and a half of saturated snow is about 30 psf, half the 60 psf design number, and it can land in a day with a rain-on-snow event.
Drifts break the average. Wind moves snow off open roof and piles it against parapets, rooftop units and taller walls, and the drift pocket can carry several times the load of the open field.
A rain-on-snow event is the sudden version. Warm rain falls on a pack that already holds water, the snow absorbs it and the load climbs without a single new flake. That is when drains matter most, and when a frozen drain turns a heavy roof into a heavier one. We watch the forecast in the weeks of the first deep pack, and we call owners with clearing recommendations before the rain arrives. The code accounts for drifts in design, but old roofs, added equipment and later alterations can change the pattern. Snow guards, which hold the pack on a slope, change it too. We map drift pockets before we decide on repairs, since the same pocket will form again. The map is a sketch with measurements: where the parapet stands, how tall the unit is, which way the wind blows in a storm and where the snow lands. It costs an hour on the roof and, once drawn, it tells the owner where to put snow guards, where to add a drain and where to avoid placing new equipment.
Where It Fails First: Drift Pockets, Eaves and Drains
Drift pockets behind parapets and rooftop units are the first structural concern. Eaves and edges are the first surface concern, where ice forms from meltwater refreezing at the cold edge. Drains are the first water concern, because a drain that freezes forces water across the roof and into any gap. The roof drain and scupper checks come first on a winter walk.
The risk climbs with the snow depth, and the depth changes across the region. Yearly totals come to about 59 inches at Post Falls, 76 at Wallace and over 100 at Mullan, with Wallace's record of 167 inches coming in 1968 to 1969. A tilt-up at Riverbend Commerce Park sees a regime that a building in the Silver Valley does not. The farther east on I-90, the earlier in the fall the first walk should happen and the more the owner should plan for snow removal or snow guards.
Alternates: Guards, Heat Cable and Snow Removal Plans
The alternates are practical. Snow guards on sloped metal roofs, set to the load the roof can carry. Heat cable at eaves, valleys and drains that ice. A heavier gutter with closer hangers. Additional drains or overflow scuppers. A written snow removal plan that says when to clear, who clears, with what tools and which areas to leave alone. Each is a line with a price.
Clearing snow is itself a risk. Shovels and scrapers cut membranes, and a worker on a snow-covered roof is exposed to falls through skylights hidden under the pack. We provide removal where the owner needs it, with plastic tools and spotters, and we mark skylights and edges before the crew steps on. The ponding water repair scope comes into play when melt leaves a pond, and flashing failure repair follows when the melt finds a gap.
Schedule and Snow Window: Triage in Winter, Fix in Summer
Winter limits the work. In a storm, we make the building safe: relieve a dangerous load, clear a drain, tarp an opening. Permanent repairs wait for spring and summer, when the roof is dry and the temperatures are right for adhesives, sealants and welds. A repair planned in March should be ordered in March, with the structural pieces first, since lead times on metal and structural pieces can run weeks.
The roof sees a wide swing here, from a January mean near 31 F to a July mean near 70 F. A spring walk after the melt finds what winter did, and a fall walk before the snow makes sure it is ready. Both are part of our preventive maintenance program. If a storm is severe enough to open the roof, storm damage repair takes over with its dry-in and scope split.
Commercial Roofing Questions
How do I know if my roof is overloaded?
Look for sagging at the deck, doors that stick, new ceiling cracks and bowed purlins. Call a structural engineer if you see them.
Should we remove snow from the roof?
Only where there is a concern, and with plastic tools. We provide a plan and a crew.
What causes ice dams on a commercial roof?
Heat leaks into the roof, melts snow and the water refreezes at the cold edge. Air sealing and insulation address the cause.
Can snow guards fix sliding snow?
On sloped metal roofs, yes. They hold the pack so it melts in small amounts.
Is snow damage the same as storm damage?
It often overlaps. We separate load, ice and water findings, because each has its own repair and price.