The depth asset

Snow Load and Your Roof

Ask what the snow load is in the North Country and the truthful answer is: it depends on your exact site, and in parts of the Adirondacks the code says so explicitly. New York assigns no statewide or per-county ground snow load. Design values come from Table R301.2(1) of the Residential Code of New York State, keyed to ASCE 7-22, with case-study zones where only site-specific analysis gives the number.

That answer frustrates people shopping for a quick figure, and it is the most useful thing a Clinton, Franklin, Essex, or St. Lawrence county homeowner can understand before a roof project. Here is the framework, plainly.

How the number is actually set

• The table, not a rumor. Residential design ground snow load comes from Table R301.2(1) of the Residential Code of New York State; commercial and larger structures use Section 1608.2 and Figure 1608.2 of the Building Code. Both key to ASCE 7-22, the national standard whose geodatabase maps measured ground snow values.
• Elevation adjusts it. The framework adds roughly 2 psf of ground snow load per 100 feet of site elevation above 1,000 feet. Much of the Adirondack interior clears that threshold by a lot, which is why town averages mislead.
• Case-study zones hand it to engineers. Where terrain makes snowfall vary too sharply for a mapped value, the code marks case-study (CS) territory. The High Peaks region in Essex County is the clearest example: a Lake Placid parcel's design load is determined for that parcel, not read off a map.
• Valley figures are illustrations only. At lower elevations, values often land in the 50 to 70 psf range. Treat that strictly as context for understanding quotes, never as a design number; your town code enforcement office or a site-specific analysis gives the real one.

Sources: Residential Code of NYS Table R301.2(1) and Building Code Section 1608.2 (codes.iccsafe.org); ASCE 7-22 ground snow load geodatabase (ascehazardtool.org).

What the number touches on a metal roof

Ground snow load is not trivia; it flows into most of the decisions this site covers. It sizes the structure on new construction. It sets the row count and spacing of engineered snow retention, because retained pack is load the roof carries on purpose. It informs gauge selection, since heavier 24-gauge panels carry pack with less distortion, and it belongs in any replacement conversation on an older home whose framing predates the modern tables. A quote that never mentions it is a quote about a covering, not a roof.

Reading your own site

Three questions locate almost any parcel in the framework. What is the site elevation, and how far above 1,000 feet? Which terrain band is it in: the Lake Champlain shore around Plattsburgh, the St. Lawrence lowlands around Massena, or the interior around Saranac Lake and Lake Placid, where the case-study zones live? And does the roof geometry create drift traps, the valleys and dormer shadows where load concentrates? Bring those three answers to your code office or contractor and the conversation starts halfway done. The rest of the assembly picture is in The North Country Standing Seam Metal Roofing Guide.