Rolette County, ND Roof Snow Load - 35 psf

Rolette County, ND roof snow load, translated

On a roof that means 77 in. of fresh snow, 28 in. once it packs down, or 7 in. of solid ice - three very different piles for the same load. This is a serious structural load - older homes built before modern snow-load provisions, or ones with low-slope or flat roof sections, are worth having checked.

Rolette County, ND: quick facts

• Design roof snow load35 psf
• Ground snow load, ASCE 7 map50 psf
• National rank#172 of 2,758
• North Dakota rank#8 of 49
• Population11,692
• Annual snowfall, NOAA normal37.6 in.
• FIPS38079

Where Rolette County ranks

#8 of 49 North Dakota counties by design load, top 6% of 2,758 nationally - that's Rolette County's spot. 29.4 psf is North Dakota's typical county figure - Rolette County beats it by 5.6 psf.

FIPS 38079, population 11,692, centered near 48.7683°N 99.8405°W. ASCE 7's underlying ground snow load here is 50 psf before the code's exposure and importance factors bring it to the 35 psf design figure above.

Rolette County: average annual snowfall

Rolette County sees about 37.6 in. of snow most winters, per the HANSBORO 4 NNE, ND US station's 1991-2020 NOAA normal. That station is far enough away (27.5 mi) that local snowfall - especially at a different elevation or near a lake - can run noticeably higher or lower than this figure. See the density guide.

Read this before you use Rolette 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.)