McCormick County, SC Roof Snow Load - 10 psf
What ASCE 7 says about snow load in McCormick County
That's McCormick 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 psf is what the ground-load formula alone gives; McCormick County's 10 psf low-slope minimum (§7.3.4) beats it, so that figure is the one that governs on flat and low-pitch roofs.
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. Standard residential construction handles a load this size without extra bracing; it is a modest addition on top of ordinary roof loading.
McCormick County, SC: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,999 of 2,758
- South Carolina rank#35 of 46
- Population9,983
- Annual snowfall, NOAA normal0.3 in.
- FIPS45065
Where McCormick County's figure sits nationally
Out of 2,758 rated US counties, McCormick County sits at #1,999, the top 72% nationally - #35 of 46 within South Carolina. 8.8 psf is South Carolina's typical county figure - McCormick County beats it by 1.2 psf.
Near 33.8976°N 82.3162°W, FIPS 45065: McCormick County counts 9,983 residents and a 10 psf map value, which the code's own factors turn into 10 psf.
How much it actually snows in McCormick County
Most winters bring McCormick County roughly 0.3 in. of snow - NOAA's normal at LINCOLNTON, GA US, 12.2 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
McCormick 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 McCormick County's county-wide figure. (How this figure is calculated.)