St. Helena Parish, LA Roof Snow Load - 0 psf
St. Helena Parish, LA roof snow load, translated
A typical heated home in St. Helena Parish 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.
St. Helena Parish in numbers
- Design roof snow load0 psf
- Ground snow load, ASCE 7 map0 psf
- National rank#2,710 of 2,758
- Louisiana rank#63 of 64
- Population10,857
- Annual snowfall, NOAA normal0.1 in.
- FIPS22091
Where St. Helena Parish ranks
#63 of 64 Louisiana counties by design load, top 98% of 2,758 nationally - that's St. Helena Parish's spot. Louisiana counties average 2.4 psf; St. Helena Parish runs 2.4 psf lower than that.
FIPS 22091, population 10,857, centered near 30.8225°N 90.7083°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.
St. Helena Parish: average annual snowfall
St. Helena Parish sees about 0.1 in. of snow most winters, per the AMITE, LA US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use St. Helena Parish'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.)