SnowLoadCheck

Vermilion County, IL Roof Snow Load - 20 psf

How much snow is too much for a roof in Vermilion County, IL?

Moderate
20 psf

20 psf: that's what ASCE 7-22 requires a typical heated home's roof in Vermilion County to carry. Flat and low-pitch roofs in Vermilion County are actually governed by ASCE 7's §7.3.4 minimum of 20 psf, not the 14 psf the ground-load formula alone would produce.

Picture it, not just weigh it: 44 in. if it's fresh powder, 16 in. once it settles, or a mere 4 in. if it's ice. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.

Snow on Vermilion County's roofs right now?

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Vermilion County, IL: quick facts

How Vermilion County compares

20 psf ranks #691 of 2,758 US counties with a mapped snow load (top 25%) - and #21 of 102 in Illinois. That's 0.7 psf above Illinois's own county-average design load of 19.3 psf.

Population 71,106 (FIPS 17183), roughly 40.1868°N 87.7268°W. The 20 psf ground snow load ASCE 7-22 maps here becomes 20 psf once the code's own design factors are applied.

Typical snowfall in Vermilion County, IL

NOAA's 30-year normal for Vermilion County: 14.8 in. of snow a year, from the DANVILLE SEWAGE PLT, IL US station. (fresh vs. packed vs. ice explains why.)

What this Vermilion County figure assumes

This is a county-level reference figure for a typical heated home built to Risk Category II (ordinary residential), on a partially exposed lot - the assumptions ASCE 7-22 itself treats as the default case. A steeper roof, a fully exposed hilltop lot, an unheated structure, or a higher risk category all change the actual number.

Vermilion County's permit office wants an address-specific figure, not this county average - the ASCE 7 Hazard Tool is free, takes under a minute, and outputs a PDF most reviewers accept. Details: the calculation guide.