Iosco County, MI Roof Snow Load - 28 psf
Iosco County, MI roof snow load, translated
A typical heated home in Iosco County is designed to carry 28 pounds per square foot of snow on its roof, per ASCE 7-22.
On a roof that means 61.6 in. of fresh snow, 22.4 in. once it packs down, or 5.6 in. of solid ice - three very different piles for the same load. This is a meaningful design load - most modern-code homes handle it fine, though an addition, a carport or a flat-roofed section can be a weak spot.
Iosco County at a glance
- Design roof snow load28 psf
- Ground snow load, ASCE 7 map40 psf
- National rank#246 of 2,758
- Michigan rank#38 of 70
- Population25,361
- Annual snowfall, NOAA normal41.3 in.
- FIPS26069
Where Iosco County ranks
#38 of 70 Michigan counties by design load, top 9% of 2,758 nationally - that's Iosco County's spot. 31.7 psf is Michigan's typical county figure - Iosco County comes in 3.7 psf under it.
FIPS 26069, population 25,361, centered near 44.3869°N 83.3801°W. ASCE 7's underlying ground snow load here is 40 psf before the code's exposure and importance factors bring it to the 28 psf design figure above.
Iosco County: average annual snowfall
Iosco County sees about 41.3 in. of snow most winters, per the GLENNIE 2SE, MI US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Iosco 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.