How Much Snow is Too Much Snow on Your Roof?

Got snow on your roof? Here’s how to know if you should remove it.

Image: Simon Steinberger/ Pixabay

Wow. That’s a lot of snow on your roof. So much snow that you’re not sure if you’re going to be able to sleep tonight for fear of it caving in. Well, odds are it’s not going to cave in.

But if you’re really worried, here’s how to figure out if your roof is at risk — and how to remove that risk.

How Much Does the Snow Weigh?

The critical factor in determining excessive snow loads on your roof isn’t the depth of the snow, it’s the weight, says home improvement expert Jon Eakes.

That’s because wet snow is a whole lot heavier than dry, fluffy snow. In fact, six inches of wet snow is equal to the weight of about 38 inches of dry snow. That’s a huge difference!

The good news is that your roof is required by building codes to withstand the heaviest snows for your part of the country.

“Theoretically, if your roof is built to code, it’s built to support more than the normal load of snow and ice,” says Eakes.

How to know if you’ve got wet or dry snow?  You back will let you know. Simply heft a few shovelfuls — you should be able to quickly tell. Plus, local weather forecasts should alert you if snow loads are becoming excessive.

How to Tell if the Snow Load on Your Roof Is Too Much

Your interior doors are a really good clue. If they begin to stick, that signals there’s enough weight on the center structure of the house to distort the door frame (yikes!).

Ignore doors on exterior walls but check interior doors leading to second-floor bedrooms, closets, and attics in the center of your home. Also, examine the drywall or plaster around the frames of these doors for visible cracks.

Homes that are most susceptible to roof cave-ins are those that underwent sloppy renovations. Improper removal of interior load-bearing walls is often responsible for catastrophic roof collapses from snow.

If You Think the Snow Needs to Be Removed

Most home roofs aren’t readily accessible, making the job dangerous for do-it-yourselfers.

“People die every year just climbing ladders,” Eakes points out. “Add ice and snow and you’re really asking for trouble.”

Instead, call a professional snow removal contractor to safely do the job.

Check to make sure they are licensed and insured — that immediately sets them apart from inexperienced competitors.

Expect to pay $250 to $500 for most jobs. That’s because they need special gear, including sturdy extension ladders, properly anchored safety harnesses, and specialized snow and ice-removal tools.

Don’t expect (or demand) a bone-dry roof at job’s end. The goal is to remove “excessive” weight as opposed to all weight. Plus, any attempt to completely remove the bottom layer of ice will almost always result in irreparable damage to your roofing.

If You Want to Remove Snow Yourself

If you have a small, one-story bungalow where the roof is just off the ground, taking matters into one’s own hands may be safe — if you can work entirely from the ground and have the right tools.

Long-handled snow rakes work great on freshly fallen snow, and at $45 they are relatively affordable. Look for models with sturdy telescoping handles and built-in rollers, which keep the blade safely above the shingles.

Other versions work by releasing the snow from underneath. These models slide between the roof and snow, allowing gravity and the snow’s own weight to do most of the work. These are more pricey, rising well above $100. But it’s a good idea to rethink their use. Eakes points out, “They tend to work their best on light, fluffy snow — the kind that probably doesn’t need to be removed in the first place.”

A couple of tips if you’re going to remove snow from the roof yourself:

1. You’ll need to anticipate where the snow and ice will fall as you pull it off your roof — you won’t want to pull a load of heavy, wet snow down on top of yourself or any helpers.

2. Remember, the goal isn’t to remove all visible snow and ice, but rather just enough to relieve the excessive load on the roof.

Related: Tips for Storing All Your Messy Winter Gear

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