SnowLoadCheck

Darlington County, SC Roof Snow Load - 10 psf

How much snow is too much for a roof in Darlington County, SC?

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10 psf

10 psf: that's what ASCE 7-22 requires a typical heated home's roof in Darlington County to carry. Flat and low-pitch roofs in Darlington County are actually governed by ASCE 7's §7.3.4 minimum of 10 psf, not the 7 psf the ground-load formula alone would produce.

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. A modest addition to standard roof loading. Ordinary residential construction handles this without extra bracing.

Already snow on the roof in Darlington County?

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Darlington County in numbers

How Darlington County compares

10 psf ranks #1,753 of 2,758 US counties with a mapped snow load (top 64%) - and #18 of 46 in South Carolina. South Carolina counties average 8.8 psf; Darlington County runs 1.2 psf higher than that.

Population 62,425 (FIPS 45031), roughly 34.3322°N 79.9621°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 Darlington County, SC

NOAA's 30-year normal for Darlington County: 0.5 in. of snow a year, from the HARTSVILLE, SC US station. (fresh vs. packed vs. ice explains why.)

What this Darlington 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.

Darlington 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. Details: the calculation guide.