When Snow Slides Off the Roof, the Gutter Takes the Hit

A roof sheds snow differently than it sheds rain. Rain runs off a slope as a thin sheet. Snow packs, sits through a week of cold, then lets go in a slab after a thaw or a sunny afternoon, sometimes a foot deep and several feet wide. Where that slab lands, it hits the gutter at the eave with a load the gutter was never meant to carry in one piece. Most St. Louis homeowners who find a bent gutter run in late winter cannot say when it happened, because the damage came from a single afternoon that nobody watched.

Gutters and guards

A gutter is held up by its hangers and by the fascia behind it. When a slab of snow drops onto the trough, the force travels down the trough into the hangers, and the hangers pass it into the fascia board. The weak point is usually the fastener, not the aluminum. A hanger screwed into soft fascia pulls out with a little movement. A hanger screwed into sound wood holds, and the trough or the hanger bends first. Either way, the first sign is often a gutter that now pitches toward the house instead of toward the downspout, or a seam that opened at a corner.

Gutter guards do not change this. A guard sits on top of the trough or clips into it, and a sliding slab can lift a guard off the trough, bend its edge, or push the front lip down. Some guards add weight inside the trough, which means a snow slab lands on a heavier system. If you already have guards, look at the front edge after a slide. A guard that has lifted is also a sign that the hangers under it have taken load.

Check the run in three places. First, sight down the trough for a dip or a belly between two hangers. Second, look at the front edge where the trough meets the drip edge for a kink or a crease. Third, press gently on the fascia near the nearest hanger. If the board gives, moves, or shows a split under old paint, the problem is the board, and a new section of gutter bolted onto it will fail the same way.

Downspouts take a beating too. A slab that fills the trough can push water into the downspout faster than the elbow at the bottom can carry it, and that elbow is where a crimp or a split usually shows first. The downspout is a good place to look because it is at ground level and easy to walk.

What it costs

The cost of a snow-slide repair depends on what moved. Straightening a dipped section and resetting two hangers is a small job done from a ladder. Replacing a run of trough, or the fascia board behind it, is a different bill. The honest way to read a repair estimate is to ask which parts are being replaced and which are being reset. A line that says repair gutter with no part list hides the difference between a reset and a replacement.

Fascia is where estimates diverge. A board that is sound and painted needs a hanger, a screw into solid wood, and fresh paint on the exposed face. A board that is soft at the hanger line needs a section cut out and a new piece spliced in, and that work often means the gutter comes down first. The gutter quote should say whether fascia repair is included, excluded, or priced as a separate allowance, because a quote that leaves it out will show a lower total that is not the real job.

Guards add their own line. If a slab has lifted a guard, the guard may be bent beyond straightening, or its clips may be torn from the trough. Replacing guards on a bent run costs more than resetting them, and a guard installed over a dipped trough will not sit flat again until the trough is corrected. Ask whether the guard repair is priced per foot of run or per section, and whether the trough reset is included in that number.

Snow damage is not usually covered by a flat repair rate. A crew that comes out to reset a dozen hangers may carry a trip charge, and that charge is worth asking about before the crew arrives. A single written line that names the trip, the hangers, and the fascia checks will tell you what you are paying for.

What to ask

Ask the contractor to show you the hangers before they touch anything. Ask them to point to the screws that hold each hanger, and to say whether each screw goes into the rafter tail, the fascia board, or the sheathing behind it. A hanger held by a screw that reaches nothing solid is a repair waiting for the next slide.

Ask whether the scope lists each hanger that will be replaced and each one that will be reset. A reset hanger in soft wood is still a weak point. A written scope that counts the hangers gives you a number to check against the finished job.

Ask for photos of the run before the work, with the dip or the bent section visible, and photos after. Keep the before photos with their dates. If the damage needs to be reported to your insurer, the photos and the written scope are what you will hand over. Keys documents damage, puts a written scope with photos and measurements in your hands, and attends as the contractor while you deal with your own insurer. Missouri law (RSMo 407.725) bars a roofing contractor from representing or negotiating your insurance claim, and it also bars saying anything about paying, waiving or covering your deductible, so those questions belong with your insurer or your own adjuster.

Ask how the trough will be braced at the corners and at the downspout outlets, since those spots take the most load in a slide. A repair that resets the middle hangers and ignores the corners will sag again at the first heavy snow.

Ask who comes back if the run shows a dip after the next thaw. A good answer names a person and a phone line. The Keys office is at (314) 220-2333, and that is the number to call with a question about a repair that has already been done.

When to stop repairing and replace

If the fascia is soft across several hangers, if the trough has creased in more than one place, or if the run has been reset more than once in the same winter, the repair is probably buying time. A gutter that is repeatedly reset on the same soft board is paying for the same fix twice. Replacing the run and the board behind it is the fair comparison, and it should be priced as its own option beside the repair, with the same written scope and the same photos.