Sumter County, SC Roof Snow Load - 10 psf
What ASCE 7 says about snow load in Sumter County
That's Sumter County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. §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.
Converted to something you can actually eyeball on a roof: about 22 in. of fresh powder, 8 in. once it settles and packs down, or just 2 in. if it's turned to ice. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
Sumter County, SC: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,710 of 2,758
- South Carolina rank#12 of 46
- Population104,776
- Annual snowfall, NOAA normal0.3 in.
- FIPS45085
Where Sumter County's figure sits nationally
Out of 2,758 rated US counties, Sumter County sits at #1,710, the top 62% nationally - #12 of 46 within South Carolina. South Carolina counties average 8.8 psf; Sumter County runs 1.2 psf higher than that.
Near 33.9161°N 80.3824°W, FIPS 45085: Sumter County counts 104,776 residents and a 10 psf map value, which the code's own factors turn into 10 psf.
How much it actually snows in Sumter County
Most winters bring Sumter County roughly 0.3 in. of snow - NOAA's normal at SUMTER, SC US, 2 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Sumter County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Sumter County's county-wide figure. See the methodology guide.