Alcorn County, MS Roof Snow Load - 10 psf
Alcorn County, MS roof snow load, translated
A typical heated home in Alcorn County is designed to carry 10 pounds per square foot of snow on its roof, per ASCE 7-22. Flat and low-pitch roofs in Alcorn 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.
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.
Alcorn County, MS: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,821 of 2,758
- Mississippi rank#8 of 82
- Population34,228
- Annual snowfall, NOAA normal0.7 in.
- FIPS28003
Where Alcorn County ranks
#8 of 82 Mississippi counties by design load, top 66% of 2,758 nationally - that's Alcorn County's spot. 6.5 psf is Mississippi's typical county figure - Alcorn County beats it by 3.5 psf.
FIPS 28003, population 34,228, centered near 34.8866°N 88.5811°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.
Alcorn County: average annual snowfall
Alcorn County sees about 0.7 in. of snow most winters, per the CORINTH 7 SW, MS US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Alcorn 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. (How this figure is calculated.)