Appanoose County, IA Roof Snow Load - 20 psf
How much snow is too much for a roof in Appanoose County, IA?
20 psf: that's what ASCE 7-22 requires a typical heated home's roof in Appanoose County to carry. §7.3.4's low-slope minimum of 20 psf is what actually governs on a flat or low-pitch roof here - higher than the 14 psf the base ground-load formula gives.
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. Modern-code homes carry a load like this without issue; an older addition, a carport, or any flat-roofed section is where it is worth checking first.
Appanoose County in numbers
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#1,069 of 2,758
- Iowa rank#78 of 99
- Population12,106
- Annual snowfall, NOAA normal28.7 in.
- FIPS19007
How Appanoose County compares
20 psf ranks #1,069 of 2,758 US counties with a mapped snow load (top 39%) - and #78 of 99 in Iowa. 21.7 psf is Iowa's typical county figure - Appanoose County comes in 1.7 psf under it.
Population 12,106 (FIPS 19007), roughly 40.7442°N 92.8731°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 Appanoose County, IA
NOAA's 30-year normal for Appanoose County: 28.7 in. of snow a year, from the UNIONVILLE, MO US station. (fresh vs. packed vs. ice explains why.)
What this Appanoose 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.
Appanoose 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. See the methodology guide.