Trousdale County, TN Roof Snow Load - 10 psf
Trousdale County, TN roof snow load, translated
A typical heated home in Trousdale County is designed to carry 10 pounds per square foot of snow on its roof, per ASCE 7-22. Flat and low-pitch roofs in Trousdale County are actually governed by ASCE 7's §7.3.4 minimum of 10 psf, not the 7 psf the ground-load formula alone would produce.
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.
Trousdale County in numbers
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#1,979 of 2,758
- Tennessee rank#86 of 95
- Population12,159
- Annual snowfall, NOAA normal4.6 in.
- FIPS47169
Where Trousdale County ranks
#86 of 95 Tennessee counties by design load, top 72% of 2,758 nationally - that's Trousdale County's spot. That's 0.3 psf below Tennessee's own county-average design load of 10.3 psf.
FIPS 47169, population 12,159, centered near 36.393°N 86.1567°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.
Trousdale County: average annual snowfall
Trousdale County sees about 4.6 in. of snow most winters, per the BETHPAGE 1 S, TN US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Trousdale 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.