Walthall County, MS Roof Snow Load - 0 psf
Walthall County, MS roof snow load, translated
A typical heated home in Walthall County is designed to carry 0 pounds per square foot of snow on its roof, per ASCE 7-22.
On a roof that means 0 in. of fresh snow, 0 in. once it packs down, or 0 in. of solid ice - three very different piles for the same load. Snow load is not a factor in roof design here at all; the ground snow load figure maps to zero.
Walthall County, MS: quick facts
- Design roof snow load0 psf
- Ground snow load, ASCE 7 map0 psf
- National rank#2,695 of 2,758
- Mississippi rank#78 of 82
- Population13,839
- Annual snowfall, NOAA normal0.2 in.
- FIPS28147
Where Walthall County ranks
#78 of 82 Mississippi counties by design load, top 98% of 2,758 nationally - that's Walthall County's spot. That's 6.5 psf below Mississippi's own county-average design load of 6.5 psf.
FIPS 28147, population 13,839, centered near 31.1645°N 90.1034°W. ASCE 7's underlying ground snow load here is 0 psf before the code's exposure and importance factors bring it to the 0 psf design figure above.
Walthall County: average annual snowfall
Walthall County sees about 0.2 in. of snow most winters, per the TYLERTOWN 5ESE, MS US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Walthall 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.