Your Pre-Winter Roof Checklist: 8 Things to Check Before the First Snow

Every year it's the same story. The first real snow hits in November or December, and the phone starts ringing with homeowners who have water coming through the ceiling, ice backing up under their shingles, or a leak that "came out of nowhere." The truth is, most of those problems were there before the snow fell. The cold weather just exposed them.

The good news is that late October and early November are the perfect window to get ahead of it. A roof that's in good shape going into a New Hampshire winter will handle the snow, ice, and freeze-thaw cycles a lot better than one that's already been limping along. Here's what we'd tell you to look at before the first storm.

You can check most of these from the ground or a ladder. If something looks off, that's your cue to call for a free inspection before the snow hides it for the next four months.

1. Missing, Cracked, or Curling Shingles

Start with the obvious. Walk around your house and look up at the roof from a few angles. You're looking for shingles that are missing entirely, ones that are cracked or split, and shingles that are curling up at the edges or corners.

Shingles are your roof's first line of defense. Once a few are gone or damaged, water has a path straight to the layer underneath. In the summer that might just be a slow nuisance. In winter, with snow sitting on the roof and melting and refreezing, that same gap can turn into a real leak fast.

Curling is a sign the shingles are aging and drying out. It doesn't always mean you need a new roof tomorrow, but it does mean those areas are more likely to let go when the weather turns.

2. Clogged or Sagging Gutters

Your gutters do more than you think in the winter. When they're packed with leaves, pine needles, and debris, water can't drain. It backs up, sits against the edge of your roof, and freezes. That's one of the most common ways ice dams get started.

Clean them out before the leaves finish falling and the first freeze locks everything in place. While you're at it, look at whether the gutters are sagging or pulling away from the house. Full gutters are heavy, and winter ice makes them heavier. A gutter that's already drooping is going to struggle once it's loaded with ice.

Also make sure your downspouts are actually carrying water away from the foundation and not dumping it right at the base of the house, where it can freeze and cause its own set of problems.

3. Flashing Around Chimneys, Vents, and Valleys

Flashing is the metal that seals the joints on your roof. The places where the roof meets a chimney, where vents and pipes come through, and in the valleys where two roof planes meet. These are the spots that leak first, because they're where the roof is most vulnerable.

Look for flashing that's rusted, lifted, cracked, or pulling away. If the sealant around it is dried out and crumbling, that's a problem. Water finds these weak points, and when it freezes and expands, it widens every little gap it gets into.

Flashing issues are often a cheap fix if you catch them early and an expensive one if you wait until water's already been getting in all winter.

4. Your Attic and Insulation

A lot of roof problems in New Hampshire actually start inside the house. Head up into the attic with a flashlight on a cold day and take a look.

Are there any water stains on the underside of the roof deck? Any daylight coming through where it shouldn't? Do you feel a strong draft? Those are all signs worth getting checked.

Just as important is your insulation. Warm air escaping from your living space up into the attic is the number one cause of ice dams. That heat warms the roof, melts the snow, and the water runs down to the cold edge and refreezes. Good, even insulation keeps the heat where it belongs and keeps your roof cold enough that snow melts off evenly instead of backing up. For the full breakdown of how ice dams form and what to do about them, see our guide to ice dams in New Hampshire.

5. Attic Ventilation

Right alongside insulation is ventilation, and the two work as a team. Your attic needs to breathe. Proper intake vents down low and exhaust vents up high let cold air move through and keep the roof deck at an even temperature.

When ventilation is blocked or inadequate, you get the same ice dam problem, plus moisture buildup that can rot your roof deck and grow mold over time. If your attic feels stuffy, damp, or noticeably warmer than the outside air in winter, your ventilation probably isn't doing its job.

This is one of those things that's hard to assess on your own, and it's worth having a professional look at it, because the fix is usually straightforward once you know what's wrong.

6. Overhanging Tree Branches

Take a look at any trees near the house. Branches that hang over the roof are a winter hazard for two reasons. First, the weight of snow and ice can snap a branch and send it through your roof. Second, even branches that don't break will scrape and wear down your shingles every time the wind blows.

Trim back anything hanging over the roof before winter. It's a lot easier and safer to do it now than to deal with a branch coming down in the middle of a February storm.

7. Signs of Leaks Inside the House

Before the snow starts, do a walk-through of your top floor and ceilings. Look for water stains, discoloration, bubbling paint, or any spot that looks damp. Check the ceilings in closets and corners, which are easy to miss.

A small stain you've been ignoring is a warning. It means water is already getting in somewhere, and winter is only going to make it worse. Catching it now, while a roofer can actually get up there safely and find the source, beats waiting until there's ice on the roof and water running down your wall. For more on spotting damage before it becomes a bigger problem — especially after a storm — see how to tell if your roof has storm damage from the ground.

8. The Overall Age and Condition of Your Roof

Finally, step back and think about the big picture. How old is your roof? Most asphalt shingle roofs last somewhere between 20 and 30 years, depending on how they were installed and how well they've held up. If yours is getting up there, winter is the season that tends to push a tired roof over the edge.

You don't necessarily need to replace an older roof before every winter. But if it's aging and you're already seeing a few of the warning signs above, it's worth getting an honest assessment before the snow flies. It's a lot better to make that decision on your terms in October than to be making an emergency call in January. If you're trying to figure out whether it makes more sense to repair or replace, we break down exactly how we make that call in Repair or Replace? The Honest Math on an Aging Roof.

Not Sure What You're Looking At? Let Us Take a Look.

You don't have to figure all of this out on your own. If you went through this list and something gave you pause, or if you'd just rather have someone who does this every day take a look, we're happy to help.

A-Z Roofing is a local, New Hampshire roofing company and an Owens Corning certified contractor. We'll come out, go over your roof honestly, and tell you what actually needs attention before winter. No pressure, no scare tactics. If your roof is in good shape, we'll tell you that too.

Getting ahead of a problem in October is always cheaper and easier than dealing with it in the middle of a snowstorm. If you want peace of mind before the first real cold snap, now is the time.