Boone County, MO Roof Snow Load - 20 psf
Boone County, MO roof snow load, translated
A typical heated home in Boone County is designed to carry 20 pounds per square foot of snow on its roof, per ASCE 7-22. The physics-based figure alone would be 14 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 20 psf for flat and low-pitch roofs here, which is the number that actually governs.
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.
Boone County, MO: quick facts
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#590 of 2,758
- Missouri rank#7 of 115
- Population192,154
- Annual snowfall, NOAA normal17.4 in.
- FIPS29019
Where Boone County ranks
#7 of 115 Missouri counties by design load, top 21% of 2,758 nationally - that's Boone County's spot. Missouri counties average 18.6 psf; Boone County runs 1.4 psf higher than that.
FIPS 29019, population 192,154, centered near 38.9899°N 92.3102°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.
Boone County: average annual snowfall
Boone County sees about 17.4 in. of snow most winters, per the COLUMBIA U OF M, MO US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Boone 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.