Essex County, NJ Roof Snow Load - 20 psf
How much snow is too much for a roof in Essex County, NJ?
20 psf: that's what ASCE 7-22 requires a typical heated home's roof in Essex County to carry. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 20 psf - higher than the 17.5 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.
Essex County at a glance
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map25 psf
- National rank#517 of 2,758
- New Jersey rank#5 of 17
- Population881,527
- Annual snowfall, NOAA normal31.5 in.
- FIPS34013
How Essex County compares
20 psf ranks #517 of 2,758 US counties with a mapped snow load (top 19%) - and #5 of 17 in New Jersey. 20.1 psf is New Jersey's typical county figure - Essex County comes in 0.1 psf under it.
Population 881,527 (FIPS 34013), roughly 40.7874°N 74.2463°W. The 25 psf ground snow load ASCE 7-22 maps here becomes 20 psf once the code's own design factors are applied.
Typical snowfall in Essex County, NJ
NOAA's 30-year normal for Essex County: 31.5 in. of snow a year, from the NEWARK INTL AP, NJ US station. (fresh vs. packed vs. ice explains why.)
What this Essex 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.
Essex 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.)