Trimble County, KY Roof Snow Load - 20 psf
Trimble County, KY roof snow load, translated
A typical heated home in Trimble County is designed to carry 20 pounds per square foot of snow on its roof, per ASCE 7-22. 14 psf is what the ground-load formula alone gives; Trimble County's 20 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 44 in. of fresh snow, 16 in. once it packs down, or 4 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.
Trimble County in numbers
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#1,135 of 2,758
- Kentucky rank#15 of 120
- Population8,591
- Annual snowfall, NOAA normal20.6 in.
- FIPS21223
Where Trimble County ranks
#15 of 120 Kentucky counties by design load, top 41% of 2,758 nationally - that's Trimble County's spot. That's 4.3 psf above Kentucky's own county-average design load of 15.7 psf.
FIPS 21223, population 8,591, centered near 38.62°N 85.3512°W. ASCE 7's underlying ground snow load here is 20 psf before the code's exposure and importance factors bring it to the 20 psf design figure above.
Trimble County: average annual snowfall
Trimble County sees about 20.6 in. of snow most winters, per the VEVAY, IN US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Trimble 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. (How this figure is calculated.)