Horry County, SC Roof Snow Load - 10 psf
What ASCE 7 says about snow load in Horry County
That's Horry 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; Horry 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. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
Horry County at a glance
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,660 of 2,758
- South Carolina rank#3 of 46
- Population413,391
- Annual snowfall, NOAA normal0.5 in.
- FIPS45051
Where Horry County's figure sits nationally
Out of 2,758 rated US counties, Horry County sits at #1,660, the top 60% nationally - #3 of 46 within South Carolina. South Carolina counties average 8.8 psf; Horry County runs 1.2 psf higher than that.
Near 33.9093°N 78.9767°W, FIPS 45051: Horry County counts 413,391 residents and a 10 psf map value, which the code's own factors turn into 10 psf.
How much it actually snows in Horry County
Most winters bring Horry County roughly 0.5 in. of snow - NOAA's normal at LONGWOOD, NC US, 25.6 mi off. 25.6 mi is a real gap between Horry County and its nearest reporting station, so local snowfall can diverge from this figure, especially near elevation changes. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Horry 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 Horry County's county-wide figure. Details: the calculation guide.