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Kamloops, BC
Gutter advice written for a wet climate gets this city wrong. What governs here is a fifteen-minute burst in summer and a daily freeze-thaw cycle in winter — and the winter load is ice, not water.
Almost everything written about gutters assumes a wet climate. Capacity, linear feet per downspout, leaf guards, the whole vocabulary comes from places where the governing condition is weeks of sustained rain. Kamloops is not that place, and importing that thinking produces gutters that are wrong in both directions at once — oversized for the season, undersized for the day, and aimed at the wrong failure entirely.
Two local conditions actually govern, and neither is annual volume.
City of Kamloops — climatic design data
Maximum 15-minute rainfall: 13 mm · Maximum one-day rainfall: 57 mmCity of Kamloops Building By-law No. 11-80, Climatic Data table. The by-law is consolidated for convenience and the table dates from 1993 — confirm current design values with the City’s Building Inspection Section.
The first is the burst. Rain here does not arrive as drizzle, it arrives as an event. Thirteen millimetres inside a quarter of an hour, landing on a roof plane that funnels all of it toward a small number of outlets, is a genuinely demanding moment for a gutter — and it is over before anyone thinks to go outside and look. The overflow that damaged the fascia happened during a fifteen-minute window in July.
The second is the melt cycle, and it is the one that does the lasting damage.
Through a Kamloops winter, sun on a snow-covered roof produces meltwater during the day. That water runs to the eave, reaches the gutter — which sits out beyond the heated envelope of the building, in shade, exposed on all sides — and refreezes there overnight. The next day it happens again, onto ice that is already there.
What follows is not a capacity problem. It is a loading problem:
Say the unpopular part plainly: a gutter will not fix an ice dam. Ice damming is driven by heat escaping into the attic and melting the underside of the snowpack, and it happens on houses with gutters and houses without them. New gutters are sometimes sold as the remedy. They are not one.
What a gutter does do is show you the problem early and get damaged by it. The actual fixes are attic insulation and ventilation, and ice-and-water membrane at the eaves — roof work, not gutter work. Anyone quoting gutters as an ice-dam cure is selling the wrong product.
Coastal gutter guards are designed against leaf litter — a wet mat that sits on top and blocks the opening. That is not what fills a gutter in Kamloops.
Here it is grit: dust, fine sediment, pine needles, and mineral granules shed by asphalt shingles ageing under strong ultraviolet exposure. Grit does not mat on the surface. It washes through, settles, and packs into a dense sludge at the low end and in the downspout outlet — the one place you cannot see from the ladder. A gutter can look clear along its whole length and be completely blocked at the one point that matters.
Two practical consequences. First, screens sized to stop leaves do very little about grit, which passes straight through them — so a guard is a smaller win here than the sales pitch suggests. Second, when clearing gutters, the outlet and the downspout are the job. The trough is the easy part.
Granules accumulating fast is also information about the roof rather than the gutter. What that means for the roof itself is covered on the roof repair page.
Given all of the above, most of what makes a gutter installation good here is unglamorous and none of it is the colour.
Fall to the outlet. A gutter is supposed to slope. A dead-level run holds standing water, which in this climate means it holds ice. This is the single most common installation shortcut and the most consequential.
Enough outlets, and where they are. More downspouts on a long run beats a bigger trough, because every outlet is another chance for water to leave before the run overflows and another path that is not yet frozen.
Hanger spacing and fascia condition. The system has to carry an ice load, not a water load. If the fascia is already soft, hanging a gutter on it postpones a carpentry job rather than avoiding it.
Where the water goes after the downspout. Discharging beside the foundation concentrates the entire roof’s burst rainfall into one spot of ground. Extensions and splash blocks are cheap and they are the part most often left off.
If the roof above is metal, the gutter has a different problem again: snow releases off metal in sheets rather than melting away gradually, and a sheet coming off a slope can take a gutter with it. That interaction needs to be designed for rather than discovered — see metal roofing.
If water is already getting in behind the fascia or into a soffit, that is roof work rather than gutter work — start with a written inspection so the cause is recorded before anything is replaced.
Tell us what the gutters are doing and we’ll pass it to a local Kamloops roofer for a quote.
Not by annual rainfall, which is low and misleading. The governing conditions are the burst and the freeze. The City's climatic table puts maximum 15-minute rainfall at 13 mm, so a gutter has to handle a short intense event rather than sustained volume, and through winter it has to carry the weight of ice rather than the flow of water.
No. Ice damming is driven by heat escaping into the attic and melting the underside of the snowpack, and it happens on houses with gutters and houses without them. Gutters show the problem and get damaged by it. The actual remedies are attic insulation and ventilation, and ice-and-water membrane at the eaves, which are roof work rather than gutter work.
Weight, not water. Meltwater runs off a sunlit snowy roof during the day and refreezes in the gutter overnight, and the cycle repeats through the season. A gutter packed with ice weighs far more than it was hung to carry, so hangers loosen and the gutter drops away from the fascia. The fall to the outlet is then lost permanently, even after the ice melts.
Less than the sales pitch suggests. Guards are designed against leaf litter that mats on top of the opening. What fills a gutter here is grit: dust, pine needles and mineral granules shed by asphalt shingles ageing under strong sun. Grit passes straight through most screens, then settles and packs at the outlet where it cannot be seen.
At the outlet and inside the downspout, not along the trough. Sediment washes through, settles at the low end and compacts into a dense sludge. A gutter can look clear along its entire visible length and be completely blocked at the one point that matters, so clearing the outlet and the downspout is the real job.
The case for them is not the volume of rain, it is where the water goes. Without gutters, every burst discharges off the roof edge directly onto the ground at the base of the wall. Whether that matters depends on the building, the grade and what is below the eave, which is a question for someone looking at the specific house.