Dunn County, WI Roof Snow Load - 35 psf
Dunn County, WI roof snow load, translated
A typical heated home in Dunn County is designed to carry 35 pounds per square foot of snow on its roof, per ASCE 7-22.
On a roof that means 77 in. of fresh snow, 28 in. once it packs down, or 7 in. of solid ice - three very different piles for the same load. A serious structural load. Homes built before modern snow-load provisions, or with low-slope/flat roof sections, are the ones most worth having checked.
Dunn County, WI: quick facts
- Design roof snow load35 psf
- Ground snow load, ASCE 7 map50 psf
- National rank#124 of 2,758
- Wisconsin rank#24 of 72
- Population46,135
- Annual snowfall, NOAA normal40.9 in.
- FIPS55033
Where Dunn County ranks
#24 of 72 Wisconsin counties by design load, top 4% of 2,758 nationally - that's Dunn County's spot. Wisconsin counties average 30.9 psf; Dunn County runs 4.1 psf higher than that.
FIPS 55033, population 46,135, centered near 44.9478°N 91.8976°W. ASCE 7's underlying ground snow load here is 50 psf before the code's exposure and importance factors bring it to the 35 psf design figure above.
Dunn County: average annual snowfall
Dunn County sees about 40.9 in. of snow most winters, per the MENOMONIE, WI US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Dunn 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.)