Delaware's Winter Roof Exposure
Delaware's winters run through the same freeze-thaw cycle that stresses low-slope commercial roofs across the mid-Atlantic - NOAA's New Castle County Airport normals put the state at roughly 20 inches of snowfall in a typical year, most of it arriving in a small number of nor'easter events rather than spread evenly through the season. That pattern matters for claims: a single nor'easter can drop a foot of wet, heavy snow on a large flat roof in Newark or along the Route 13 corridor near Dover, followed by days of temperatures cycling above and below freezing that turn standing snow into ice at every drain, scupper, and parapet.
Inland commercial buildings - warehouses and distribution centers along I-95, office parks around Newark and Christiana, government and institutional buildings near Dover's Legislative Mall - see more of this exposure than the moderated coastal strip near Rehoboth and Lewes, where ocean influence keeps winter temperatures a few degrees milder and snow loads generally lighter.
How Snow Load and Ice Dams Damage a Low-Slope Roof
Wet, heavy snow adds real structural load to a roof deck, and on an older building or one with a marginal design load, that weight alone can stress the deck and fastening system even without a leak developing right away. More commonly, the damage shows up as ice: snow that partially melts during a warm afternoon and refreezes overnight backs up at drains, scuppers, and parapet transitions, forming ice dams that block normal drainage. Meltwater then has nowhere to go but under flashing, through seams, and into the building.
What Our Winter Damage Documentation Covers
After a significant snow or ice event, our inspection maps standing snow and ice accumulation at drains, scuppers, and low points, documents any deck deflection or structural stress from load, and photographs ice damming at parapets and roof-to-wall transitions where meltwater intrusion is most likely. Where a leak has already developed, we trace it back to the specific blocked drainage point or failed flashing detail rather than treating the whole roof as a single loss, which produces a cleaner, more defensible scope.
Distinguishing Storm Damage From Pre-Existing Drainage Problems
Not every winter leak is storm damage. A roof with a drainage system that was already undersized or partially clogged before the snow event may leak in conditions a properly maintained roof would handle without issue. We document both: what the storm actually added in terms of load and ice, and what the roof's existing drainage condition was going into the event, because that distinction affects how a claim gets evaluated and whether the fix is a covered repair or a maintenance item.
Meeting the Adjuster After a Winter Event
Snow and ice claims often get inspected after the snow has melted, which means the physical evidence - the ice dam itself, the standing water - is gone by the time the adjuster arrives. That's why we document during or immediately after the event whenever possible: photos of actual ice accumulation and water paths carry more weight than a post-melt description of where the water must have been.
We're your roofing contractor, not a public adjuster - we document the snow load, ice location, and drainage failure on your roof so your adjuster has the physical evidence, beyond a description of a leak that showed up after the snow was gone.
Frequently Asked Questions
It depends on your policy's language around weight-of-ice-and-snow and water-damage coverage, and on whether the underlying cause is treated as storm-driven or as a pre-existing drainage or maintenance issue. We document the physical evidence; your policy determines how it applies.
Around 20 inches in a typical year per NOAA's New Castle County Airport normals, usually concentrated in a handful of nor'easter events rather than spread evenly across the winter, which is why a single storm can produce significant load and ice-damming even in a state that isn't known for heavy annual snowfall.
An ice dam forms when melted snow refreezes at a drain, scupper, or parapet transition, blocking normal drainage. Meltwater behind the dam backs up and finds its way under flashing or through seams, which is a common cause of winter leaks even on roofs with no other damage.
Before, whenever it's safe to access the roof. Photos of actual ice accumulation and standing water carry more weight in a claim than a description given after everything has melted.
Generally yes - the moderating effect of the ocean near Rehoboth and Lewes tends to mean milder winter temperatures and lighter snow loads than inland areas around Dover, Newark, and the I-95 corridor, though ice-forming freeze-thaw cycles can still occur near the coast.