Duplin County, NC Roof Snow Load - 10 psf
Duplin County, NC roof snow load, translated
A typical heated home in Duplin County is designed to carry 10 pounds per square foot of snow on its roof, per ASCE 7-22. 7 psf is what the ground-load formula alone gives; Duplin 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.
On a roof that means 22 in. of fresh snow, 8 in. once it packs down, or 2 in. of solid ice - three very different piles for the same load. A modest addition to standard roof loading. Ordinary residential construction handles this without extra bracing.
Snow on Duplin County's roofs right now?
Duplin County in numbers
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,778 of 2,758
- North Carolina rank#73 of 100
- Population50,539
- Annual snowfall, NOAA normal2 in.
- FIPS37061
Where Duplin County ranks
#73 of 100 North Carolina counties by design load, top 64% of 2,758 nationally - that's Duplin County's spot. That's 2.9 psf below North Carolina's own county-average design load of 12.9 psf.
FIPS 37061, population 50,539, centered near 34.9344°N 77.9335°W. ASCE 7's underlying ground snow load here is 10 psf before the code's exposure and importance factors bring it to the 10 psf design figure above.
Duplin County: average annual snowfall
Duplin County sees about 2 in. of snow most winters, per the WARSAW 5 E, NC US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Duplin County's figure
The figure above assumes the case ASCE 7-22 treats as typical: a heated, ordinary-occupancy home on a partially exposed site. Change any of those - exposure, heating, roof pitch, occupancy category - and the real design number moves.
A building permit needs the number at your exact address, not the county average - the free ASCE 7 Hazard Tool returns that from your coordinates in about a minute and produces a PDF a plan reviewer will accept. Details: the calculation guide.