Johnson County, AR Roof Snow Load - 10 psf
How much snow is too much for a roof in Johnson County, AR?
10 psf: that's what ASCE 7-22 requires a typical heated home's roof in Johnson County to carry. §7.3.4's low-slope minimum of 10 psf is what actually governs on a flat or low-pitch roof here - higher than the 7 psf the base ground-load formula gives.
Picture it, not just weigh it: 22 in. if it's fresh powder, 8 in. once it settles, or a mere 2 in. if it's ice. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
Snow on Johnson County's roofs right now?
Johnson County at a glance
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,867 of 2,758
- Arkansas rank#24 of 75
- Population26,172
- Annual snowfall, NOAA normal2.3 in.
- FIPS05071
How Johnson County compares
10 psf ranks #1,867 of 2,758 US counties with a mapped snow load (top 68%) - and #24 of 75 in Arkansas. 10.1 psf is Arkansas's typical county figure - Johnson County comes in 0.1 psf under it.
Population 26,172 (FIPS 05071), roughly 35.5734°N 93.4663°W. The 10 psf ground snow load ASCE 7-22 maps here becomes 10 psf once the code's own design factors are applied.
Typical snowfall in Johnson County, AR
NOAA's 30-year normal for Johnson County: 2.3 in. of snow a year, from the CLARKSVILLE 6 NE, AR US station. (fresh vs. packed vs. ice explains why.)
What this Johnson 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.
Johnson 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. (How this figure is calculated.)