Johnson County, GA Roof Snow Load - 5 psf
Johnson County, GA: your roof's ASCE 7 snow number, in plain English
Johnson County's roofs are built to hold 5 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. 3.5 psf is what the ground-load formula alone gives; Johnson County's 5 psf low-slope minimum (§7.3.4) beats it, so that figure is the one that governs on flat and low-pitch roofs.
In depth, not weight: that's roughly 11 inches of fresh, light snow, 4 inches of old, settled snow, or as little as 1 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. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
Johnson County in numbers
- Design roof snow load5 psf
- Ground snow load, ASCE 7 map5 psf
- National rank#2,393 of 2,758
- Georgia rank#82 of 159
- Population9,178
- Annual snowfall, NOAA normal0 in.
- FIPS13167
Johnson County by the numbers
Nationally that's #2,393 out of 2,758 rated counties, the top 87%; within Georgia alone, Johnson County ranks #82 of 159. Georgia counties average 3.6 psf; Johnson County runs 1.4 psf higher than that.
Johnson County, FIPS 13167, is home to 9,178 people near 32.6946°N 82.664°W. Its 5 psf ground snow load figure is the map value; 5 psf is what a roof is actually designed for.
Johnson County's snowfall, most winters
0 in. a year: that's Johnson County's NOAA 1991-2020 snowfall normal, measured at DUBLIN, GA US (16.9 mi away). See the density guide.
Before you rely on Johnson County's number
Treat the Johnson 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. Details: the calculation guide.