SnowLoadCheck

Martin County, IN Roof Snow Load - 20 psf

What ASCE 7 says about snow load in Martin County

Moderate
20 psf

That's Martin County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. The physics-based figure alone would be 14 psf, but ASCE 7's own low-slope minimum (§7.3.4) sets a floor of 20 psf for flat and low-pitch roofs here, which is the number that actually governs.

Converted to something you can actually eyeball on a roof: about 44 in. of fresh powder, 16 in. once it settles and packs down, or just 4 in. if it's turned to 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.

Martin County, IN: quick facts

Where Martin County's figure sits nationally

Out of 2,758 rated US counties, Martin County sits at #1,106, the top 40% nationally - #72 of 89 within Indiana. 19.3 psf is Indiana's typical county figure - Martin County beats it by 0.7 psf.

Near 38.7053°N 86.8018°W, FIPS 18101: Martin County counts 9,864 residents and a 20 psf map value, which the code's own factors turn into 20 psf.

How much it actually snows in Martin County

Most winters bring Martin County roughly 13.2 in. of snow - NOAA's normal at WILLIAMS 3 SW, IN US, 7.6 mi off. (fresh vs. packed vs. ice explains why.)

Read this before you rely on it

Martin County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.

Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Martin County's county-wide figure. (How this figure is calculated.)