Madison County, TN Roof Snow Load - 10 psf
Madison County, TN roof snow load, translated
A typical heated home in Madison County is designed to carry 10 pounds per square foot of snow on its roof, per ASCE 7-22. 7 psf is what the ground-load formula alone gives; Madison County's 10 psf low-slope minimum (§7.3.4) beats it, so that figure is the one that governs on flat and low-pitch roofs.
On a roof that means 22 in. of fresh snow, 8 in. once it packs down, or 2 in. of solid ice - three very different piles for the same load. This is a modest add-on to standard roof loading - ordinary residential construction carries it without extra bracing.
Madison County, TN: quick facts
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,717 of 2,758
- Tennessee rank#18 of 95
- Population100,409
- Annual snowfall, NOAA normal2.7 in.
- FIPS47113
Where Madison County ranks
#18 of 95 Tennessee counties by design load, top 62% of 2,758 nationally - that's Madison County's spot. 10.3 psf is Tennessee's typical county figure - Madison County comes in 0.3 psf under it.
FIPS 47113, population 100,409, centered near 35.6061°N 88.8334°W. ASCE 7's underlying ground snow load here is 10 psf before the code's exposure and importance factors bring it to the 10 psf design figure above.
Madison County: average annual snowfall
Madison County sees about 2.7 in. of snow most winters, per the JACKSON EXP STN, TN US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Madison 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. See the methodology guide.