SnowLoadCheck

Obion County, TN Roof Snow Load - 10 psf

Obion County, TN: your roof's ASCE 7 snow number, in plain English

Light
10 psf

Obion County's roofs are built to hold 10 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. The physics-based figure alone would be 7 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 10 psf for flat and low-pitch roofs here, which is the number that actually governs.

In depth, not weight: that's roughly 22 inches of fresh, light snow, 8 inches of old, settled snow, or as little as 2 inches of solid ice - snow that heavy is rare here but ice from a freeze-thaw cycle adds up far faster than the depth suggests. A modest addition to standard roof loading. Ordinary residential construction handles this without extra bracing.

Obion County at a glance

Obion County by the numbers

Nationally that's #1,840 out of 2,758 rated counties, the top 67%; within Tennessee alone, Obion County ranks #52 of 95. Tennessee counties average 10.3 psf; Obion County runs 0.3 psf lower than that.

Obion County, FIPS 47131, is home to 30,261 people near 36.3619°N 89.1481°W. Its 10 psf ground snow load figure is the map value; 10 psf is what a roof is actually designed for.

Obion County's snowfall, most winters

5.8 in. a year: that's Obion County's NOAA 1991-2020 snowfall normal, measured at UNION CITY, TN US (6.8 mi away). See the density guide.

Before you rely on Obion County's number

Treat the Obion County figure as a starting point, not a final answer: it assumes standard occupancy, a heated structure and a moderately sheltered site, per ASCE 7-22's own defaults. Exposed terrain, an unheated building or a steeper roof all shift the real number.

For a real application, skip the county number and go straight to the ASCE 7 Hazard Tool - enter your coordinates and it returns a site-specific figure a plan reviewer will recognize. (How this figure is calculated.)