Delta County, MI Roof Snow Load - 42 psf
How much snow is too much for a roof in Delta County, MI?
42 psf: that's what ASCE 7-22 requires a typical heated home's roof in Delta County to carry.
Picture it, not just weigh it: 92.4 in. if it's fresh powder, 33.6 in. once it settles, or a mere 8.4 in. if it's ice. A load this size is a serious structural matter; pre-modern-code homes and low-slope or flat-roofed sections are the ones most worth an inspection.
Delta County, MI: quick facts
- Design roof snow load42 psf
- Ground snow load, ASCE 7 map60 psf
- National rank#38 of 2,758
- Michigan rank#12 of 70
- Population36,687
- Annual snowfall, NOAA normal46.9 in.
- FIPS26041
How Delta County compares
42 psf ranks #38 of 2,758 US counties with a mapped snow load (top 1%) - and #12 of 70 in Michigan. That's 10.3 psf above Michigan's own county-average design load of 31.7 psf.
Population 36,687 (FIPS 26041), roughly 45.8052°N 86.9019°W. The 60 psf ground snow load ASCE 7-22 maps here becomes 42 psf once the code's own design factors are applied.
Typical snowfall in Delta County, MI
NOAA's 30-year normal for Delta County: 46.9 in. of snow a year, from the ESCANABA, MI US station. (fresh vs. packed vs. ice explains why.)
What this Delta County figure assumes
This is a county-level reference figure for a typical heated home built to Risk Category II (ordinary residential), on a partially exposed lot - the assumptions ASCE 7-22 itself treats as the default case. A steeper roof, a fully exposed hilltop lot, an unheated structure, or a higher risk category all change the actual number.
Delta County's permit office wants an address-specific figure, not this county average - the ASCE 7 Hazard Tool is free, takes under a minute, and outputs a PDF most reviewers accept. (How this figure is calculated.)