Snow Load on Your Roof: How Much Is Too Much?

Most modern Minnesota roofs are engineered to hold about 35 to 50 pounds per square foot of snow — roughly 2 feet of wet snow or 4-plus feet of light, dry snow. The danger sign isn't depth, it's weight plus warnings inside: new drywall cracks, doors that suddenly stick, or sagging and creaking. Flat and low-slope roofs, older structures, and additions need closer attention.

How much weight a typical roof can take

Homes built to modern Minnesota code are designed for a ground snow load in the range of 35–50 lb per square foot depending on the area, with a safety margin on top. Older homes may have been built to a lower standard, and additions, porches, and lean-to garage roofs are often the weak points.

Wet snow vs. dry snow: a big difference

Light, fluffy snow that falls when it's 10°F might weigh 3–5 lb per cubic foot. Heavy, wet snow that falls near 32°F can weigh 15–20 lb per cubic foot, and snow that has thawed and refrozen weighs even more. A foot of March slush can outweigh three feet of January powder. Rain falling onto an existing snowpack is the worst case.

How to estimate what's on your roof

A rough rule: every inch of old, settled snow is about 1 lb per square foot; every inch of ice is about 5 lb. So 12 inches of dense settled snow plus 2 inches of ice at the eaves is around 22 lb per square foot — getting into the range where you want to act, especially on a low slope.

Warning signs from inside the house

• New cracks in drywall or plaster, especially over doorways
• Interior doors or windows that suddenly stick or won't latch
• Creaking, popping, or cracking sounds from the ceiling or attic
• A visible sag or dip in the ceiling or roofline
• Sprinkler heads dropping below the ceiling tile in a finished space

If you see these, reduce the load and get the roof looked at. See roofing services.

Which roofs are most at risk

Flat and low-slope roofs (they don't shed), older homes, additions and porches, garages with long spans, and any roof where drifting piles snow deep on one side or in a valley.

Clearing snow safely — and when to hire it out

Use a roof rake from the ground to pull down the lower few feet; leave an inch so you don't gouge the shingles. Don't climb onto a snow-covered roof, and don't work under snow that could slide. For steep, high, or heavily loaded roofs, hire a crew with fall protection.

Ice adds up fast

Ice dams and refrozen meltwater concentrate weight right at the eaves and in valleys. Clearing snow before it can melt and refreeze also reduces ice load. See ice dam steaming.

Frequently asked questions

Should I rake after every snowfall? Not always — focus on the lower roof after heavy, wet storms and when a warm-up or rain is coming.

Can I damage the roof raking it? Yes, if you scrape the shingles. Leave a thin layer and pull, don't chop.

Is a creaking roof an emergency? New, loud noises with drywall cracks or a visible sag — yes. Clear the load and call.

Does Total Home Exteriors do roof snow removal? Yes, for both snow load and ice.

Worried about the load on your roof?

Total Home Exteriors clears and inspects north metro roofs all winter. Call 612-388-7795 or contact us.