Wallace County, KS Roof Snow Load - 20 psf
Wallace County, KS roof snow load, translated
A typical heated home in Wallace County is designed to carry 20 pounds per square foot of snow on its roof, per ASCE 7-22. §7.3.4's low-slope minimum of 20 psf is what actually governs on a flat or low-pitch roof here - higher than the 14 psf the base ground-load formula gives.
On a roof that means 44 in. of fresh snow, 16 in. once it packs down, or 4 in. of solid ice - three very different piles for the same load. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.
Wallace County in numbers
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#1,287 of 2,758
- Kansas rank#70 of 105
- Population1,472
- Annual snowfall, NOAA normal23.2 in.
- FIPS20199
Where Wallace County ranks
#70 of 105 Kansas counties by design load, top 47% of 2,758 nationally - that's Wallace County's spot. Kansas counties average 18.2 psf; Wallace County runs 1.8 psf higher than that.
FIPS 20199, population 1,472, centered near 38.9266°N 101.7711°W. ASCE 7's underlying ground snow load here is 20 psf before the code's exposure and importance factors bring it to the 20 psf design figure above.
Wallace County: average annual snowfall
Wallace County sees about 23.2 in. of snow most winters, per the WALLACE, KS US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Wallace 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.)