SnowLoadCheck

Andrew County, MO Roof Snow Load - 20 psf

Andrew County, MO: your roof's ASCE 7 snow number, in plain English

Moderate
20 psf

Andrew County's roofs are built to hold 20 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. Flat and low-pitch roofs in Andrew 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.

In depth, not weight: that's roughly 44 inches of fresh, light snow, 16 inches of old, settled snow, or as little as 4 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 meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.

Andrew County at a glance

Andrew County by the numbers

Nationally that's #981 out of 2,758 rated counties, the top 36%; within Missouri alone, Andrew County ranks #44 of 115. Missouri counties average 18.6 psf; Andrew County runs 1.4 psf higher than that.

Andrew County, FIPS 29003, is home to 18,091 people near 39.9889°N 94.8036°W. Its 20 psf ground snow load figure is the map value; 20 psf is what a roof is actually designed for.

Andrew County's snowfall, most winters

19.4 in. a year: that's Andrew County's NOAA 1991-2020 snowfall normal, measured at CONCEPTION, MO US (18.4 mi away). See the density guide.

Before you rely on Andrew County's number

Treat the Andrew 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. See the methodology guide.