Snow load and structural signs
Heavy, wet snow after a blizzard event can load a low-slope commercial roof well beyond what a light, dry snowfall of the same depth would put on the structure. Drifting against parapets and rooftop equipment concentrates that load unevenly, which is exactly where we look first - not the open field, but the corners, equipment islands, and leeward parapet runs where drift depth can run several times the field average. Interior signs of overload include ceiling tile staining that tracks with drift lines rather than random leak points, doors that stick from roof deflection, and, in serious cases, visible deck sag. We document all of it with photos and measurements before any snow removal happens, since removal without documentation can erase the evidence a claim needs.
Ice dams and drain failure
Ice dams on a commercial low-slope roof usually form at drains, scuppers, and parapet returns where meltwater refreezes faster than it can drain - not at roof edges the way they do on a pitched housing roof. A blocked or iced-over drain backs water up across the field, and that ponded, refreezing water finds every marginal seam and pushes into it. We check drain and scupper condition first on any winter damage call, because a single frozen drain can be responsible for water damage across a much larger roof area than the drain itself would suggest.
Once we find where water backed up, we trace it to the interior damage it caused, tying exterior ice and drainage failure directly to interior moisture readings and visible staining. That connection is what turns a general "winter damage" claim into a documented, roof-specific one.
Freeze-thaw and membrane fatigue
South Dakota's freeze-thaw cycle count is high enough that it works on a roof even in winters without a major snow event. Sealants and mastic get brittle in subzero cold and crack under the next thaw's expansion. Membrane seams that were marginal in October can open by March after a season of contraction and expansion. This kind of damage rarely comes from a single date-able event, so we document it as cumulative winter condition, with photos and, where useful, moisture scans that show the pattern across the field rather than a single point of failure.
We're your roofing contractor, not a public adjuster - we document the snow load, ice, and freeze-thaw damage so you and your carrier have an accurate roof record to work from.
Coordinating the claim through winter
Winter claims often move on a different timeline than storm claims, since some damage does not fully show itself until a thaw exposes it. We provide documentation as conditions develop rather than trying to force one inspection to capture a full season of cumulative damage, and we meet the adjuster on the roof once conditions allow safe access - snow and ice on a low-slope roof are a real fall hazard, and a rushed midwinter roof walk in bad conditions serves no one.
Building types and winter exposure
Healthcare and education buildings near Sanford USD Medical Center, Augustana University, and the University of Sioux Falls tend to run tighter interior humidity control, which makes even minor winter roof leaks show up fast on ceiling tile. Warehouse and manufacturing roofs along I-29 and I-90 carry large open fields where drift patterns and drain performance matter more than any single detail. Downtown office and retail roofs near Phillips Avenue and the Empire Mall corridor typically have more rooftop penetrations, each one a spot where ice and freeze-thaw movement can open a seam. Statewide, the same winter mechanics apply from Sioux Falls out toward Rapid City and the Black Hills, where elevation adds heavier and longer-lasting snowpack to the mix.
Questions Building Owners Ask
Does insurance cover roof damage from snow load?
It can, depending on the policy and whether the load was a covered peril event like a specific storm versus ordinary winter accumulation. We document the load, drift pattern, and any structural signs so the carrier is working from accurate roof evidence when making that determination.
How do you document ice dam damage on a flat commercial roof?
We trace the ice back to the drain or scupper that failed, photograph the backup pattern, and connect it to interior moisture or staining in the same roof zone. That drain-to-damage chain is usually the key piece of evidence for an ice-related claim.
Should we remove snow before you inspect?
Not before documentation, if it can be avoided safely. Removing snow or ice before photos and measurements are taken can erase evidence of drift patterns and load distribution that the claim may need. If active leaking or structural risk makes removal urgent, we prioritize safety first and document what we can before and during removal.
Can freeze-thaw damage be claimed if there wasn't one specific storm?
Sometimes, depending on the policy's language around cumulative versus single-event damage. We document the condition as we find it - seam fatigue, sealant cracking, membrane movement - and let the owner and carrier work out how the policy applies to that pattern.
When is it safe to inspect a roof after a heavy snow event?
Once the roof is safe to access without fall risk from ice or unstable snowpack. We prioritize buildings with active interior water first and schedule full roof documentation as conditions allow safe footing.
