Fairfield County, SC Roof Snow Load - 10 psf
How much snow is too much for a roof in Fairfield County, SC?
10 psf: that's what ASCE 7-22 requires a typical heated home's roof in Fairfield County to carry. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 10 psf - higher than the 7 psf the ground-load formula alone would give, and the code says use the larger one.
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. Standard residential construction handles a load this size without extra bracing; it is a modest addition on top of ordinary roof loading.
Fairfield County in numbers
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,905 of 2,758
- South Carolina rank#31 of 46
- Population20,369
- Annual snowfall, NOAA normal0 in.
- FIPS45039
How Fairfield County compares
10 psf ranks #1,905 of 2,758 US counties with a mapped snow load (top 69%) - and #31 of 46 in South Carolina. South Carolina counties average 8.8 psf; Fairfield County runs 1.2 psf higher than that.
Population 20,369 (FIPS 45039), roughly 34.3957°N 81.127°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 Fairfield County, SC
NOAA's 30-year normal for Fairfield County: 0 in. of snow a year, from the WINNSBORO, SC US station. (fresh vs. packed vs. ice explains why.)
What this Fairfield 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.
Fairfield 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.)