SnowLoadCheck

Allendale County, SC Roof Snow Load - 5 psf

What ASCE 7 says about snow load in Allendale County

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5 psf

That's Allendale 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 5 psf is what actually governs on a flat or low-pitch roof here - higher than the 3.5 psf the base ground-load formula gives.

Converted to something you can actually eyeball on a roof: about 11 in. of fresh powder, 4 in. once it settles and packs down, or just 1 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.

Allendale County in numbers

Where Allendale County's figure sits nationally

Out of 2,758 rated US counties, Allendale County sits at #2,413, the top 87% nationally - #46 of 46 within South Carolina. 8.8 psf is South Carolina's typical county figure - Allendale County comes in 3.8 psf under it.

Near 32.9798°N 81.3633°W, FIPS 45005: Allendale County counts 7,551 residents and a 5 psf map value, which the code's own factors turn into 5 psf.

How much it actually snows in Allendale County

Most winters bring Allendale County roughly 0.1 in. of snow - NOAA's normal at HAMPTON 1S, SC US, 16.7 mi off. (fresh vs. packed vs. ice explains why.)

Read this before you rely on it

Allendale 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 Allendale County's county-wide figure. Details: the calculation guide.