Northumberland County, VA Roof Snow Load - 20 psf
How much snow is too much for a roof in Northumberland County, VA?
20 psf: that's what ASCE 7-22 requires a typical heated home's roof in Northumberland County to carry. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 20 psf - higher than the 14 psf the ground-load formula alone would give, and the code says use the larger one.
Picture it, not just weigh it: 44 in. if it's fresh powder, 16 in. once it settles, or a mere 4 in. if it's ice. 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.
Northumberland County at a glance
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#1,068 of 2,758
- Virginia rank#69 of 110
- Population12,397
- Annual snowfall, NOAA normal8.5 in.
- FIPS51133
How Northumberland County compares
20 psf ranks #1,068 of 2,758 US counties with a mapped snow load (top 39%) - and #69 of 110 in Virginia. Virginia counties average 18.3 psf; Northumberland County runs 1.7 psf higher than that.
Population 12,397 (FIPS 51133), roughly 37.857°N 76.3797°W. The 20 psf ground snow load ASCE 7-22 maps here becomes 20 psf once the code's own design factors are applied.
Typical snowfall in Northumberland County, VA
NOAA's 30-year normal for Northumberland County: 8.5 in. of snow a year, from the N, VA US station. That station is far enough away (29.4 mi) that local snowfall - especially at a different elevation or near a lake - can run noticeably higher or lower than this figure. (fresh vs. packed vs. ice explains why.)
What this Northumberland 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.
Northumberland 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.)