McMinn County, TN Roof Snow Load - 10 psf
What ASCE 7 says about snow load in McMinn County
That's McMinn County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. §7.3.4's low-slope minimum of 10 psf is what actually governs on a flat or low-pitch roof here - higher than the 7 psf the base ground-load formula gives.
Converted to something you can actually eyeball on a roof: about 22 in. of fresh powder, 8 in. once it settles and packs down, or just 2 in. if it's turned to ice. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
McMinn County at a glance
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,768 of 2,758
- Tennessee rank#32 of 95
- Population56,754
- Annual snowfall, NOAA normal3.6 in.
- FIPS47107
Where McMinn County's figure sits nationally
Out of 2,758 rated US counties, McMinn County sits at #1,768, the top 64% nationally - #32 of 95 within Tennessee. That's 0.3 psf below Tennessee's own county-average design load of 10.3 psf.
Near 35.4245°N 84.6199°W, FIPS 47107: McMinn County counts 56,754 residents and a 10 psf map value, which the code's own factors turn into 10 psf.
How much it actually snows in McMinn County
Most winters bring McMinn County roughly 3.6 in. of snow - NOAA's normal at ATHENS, TN US, 2.1 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
McMinn County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than McMinn County's county-wide figure. (How this figure is calculated.)