Seamless Eavestroughs

It is not a preference, it is a calculation, and the inputs are roof area, roof pitch and rainfall intensity.

Roof area is the obvious one: more roof means more water arriving at the trough. But pitch matters nearly as much, because a steep roof delivers its water faster than a shallow one — the same rainfall on the same area arrives at the eave in a shorter burst, and the trough has to have the capacity to take that peak rather than the average.

Rainfall intensity is the third. Calgary's total annual precipitation is modest, but it arrives in convective summer bursts rather than steady drizzle, and a system sized for average rainfall will overflow in the July downpours that actually matter. Sizing here is a peak-capacity problem, not an annual-volume one.

Five-inch trough with 2x3 downspouts is a sound default for a bungalow, a townhouse or a straightforward two-storey with a moderate pitch. Six-inch trough with 3x4 downspouts is the right call for large or steep roofs, for long runs where downspout placement is constrained, for homes with substantial valley areas concentrating flow into one section of trough, and as a default on acreage homes.

The simplest diagnostic is your existing system: if your troughs overflow in a heavy summer rain despite being clean, the problem is capacity, not slope, and going up a size will fix what re-pitching will not.

It starts with measurement and with the fascia. Before any aluminum is formed, we check that the fascia can actually carry a loaded trough — because in a Calgary February a loaded trough means a block of ice, not a bit of water. Soft or rotten fascia gets replaced first; hanging new trough on failing wood is the fastest way to do this job twice.

Then the trough is rolled on site to the exact measured length of each run and carried up in one piece. Corners are formed, sealed and riveted; outlets are cut and sealed the same way. Every joint in the finished system is a joint we made deliberately, in a controlled way, at a location that needed one.

Hanging is done with continuous hidden hangers screwed through the trough into the fascia — not spike-and-ferrule, which is the old method and works loose as the fascia expands, contracts and eventually splits around the spike. Hidden hangers hold under snow and ice load, and they leave a clean front face with no fastener heads visible along the run.

Pitch is set by measurement rather than by eye. The working target is roughly a quarter inch of fall per ten feet toward the outlet — enough to drain fully, not so much that the trough visibly diverges from the fascia line on a long elevation. Standing water in a trough is what freezes, and ice is what tears eavestrough off a house.

Finally the downspouts, placed against roof area and run length rather than defaulting to one per corner, and the extensions that carry the discharge clear of the foundation. Colour is selected to match your fascia, soffit and roof from a stock range so the eave line reads as one detail.

The trough is only half the system. Where the water goes after it leaves the outlet decides whether the whole exercise was worth doing.

Calgary and most of the surrounding region sit on expansive clay. It takes on water and swells; it dries and shrinks. A foundation sitting in soil that is cycling through that movement is a foundation under stress, and the most efficient way to drive that cycle is to concentrate the entire roof's runoff at the base of one wall.

The working rule is to discharge well away from the foundation — a minimum of about 1.8 metres, and further on a lot that slopes back toward the house. In practice that means extensions that actually reach, rather than the stub elbow the builder installed and a homeowner later removed because it caught the lawnmower. It is the single most common and most consequential omission we find.

Downspout count matters as much as trough size, and is more often wrong. One outlet serving a forty-foot run of steep roof will overflow regardless of how large the trough is, because water cannot leave the system fast enough. We calculate outlets against area and pitch rather than placing them at the corners because that is where they are least visible.

Where a lot has a genuine grading problem — a walkout backing into a slope, a side yard that ponds, a neighbour's downspout aimed at your foundation — extensions alone will not solve it. We will tell you that plainly rather than sell a system that cannot succeed on that lot.

Eavestroughs in Calgary have to survive something most of Canada does not: repeated freeze-thaw driven by chinooks, sometimes several cycles in a single week. That is much harder on a system than a steady deep freeze.

Ice forms in a trough when standing water freezes, which is why pitch matters so much here. A trough that drains fully has little to freeze; a trough that holds water because it was hung level or backwards accumulates ice every cycle, and each cycle expands the mass and pushes on the joints, the hangers and the fascia behind them.

Ice damming at the eave is a related but separate problem, and it is worth being clear about the distinction: gutters do not cause ice dams. Ice dams are caused by heat escaping into the attic, melting snow on the upper roof, and that meltwater refreezing at the cold overhang. A clogged trough makes the resulting mass bigger and heavier, but the cause is ventilation and insulation. Anyone who tells you removing your eavestroughs will solve ice damming is selling you the wrong fix.

What we can do about it is real, though: make sure the trough drains fully so it is not adding to the ice mass, ensure the drip edge is directing water into the trough rather than behind it, and — because we also do soffit and roofing — actually address the intake ventilation at the eave that is driving the dam in the first place.

Heat cable exists and has a place, mainly on north-facing eaves and problem valleys where the geometry cannot be fixed any other way. We treat it as a targeted last resort rather than a substitute for correcting ventilation.

Eavestroughs are inexpensive relative to the rest of an exterior, which makes them the easiest thing to get right and the easiest thing to neglect. Price is driven by total linear footage, the number of storeys — a three-storey elevation needs different access than a bungalow — trough size, downspout count, and whether fascia repair is needed before anything can be hung.

Most homes are a single day on site. Larger and multi-level homes take longer, and acreage properties with substantial footprints and outbuildings take longer still.

The strongest argument for timing is bundling. If your roof is being replaced, that is by a wide margin the cheapest moment to replace the eavestrough: the crew is mobilized, the disposal is on site, the fascia is exposed and repairable, and the drip edge is going on anyway. Doing trough, drip edge and fascia as one system rather than three separate visits produces a better result for less money.

The same logic applies to a re-side, when staging is already up and trim is being reworked, and to a hail claim, when the trough is frequently dented and part of the approved scope anyway.

If none of those is happening, eavestrough still stands alone as a job — and if yours overflow in a summer downpour, sag between hangers, or streak the fascia below them, it is worth doing before it becomes a fascia and sheathing job instead.

We install seamless eavestrough throughout every Calgary quadrant, and out through Airdrie, Chestermere, Cochrane, Okotoks, High River, Langdon, Strathmore, Crossfield, Carstairs, Didsbury, Olds, Innisfail, Red Deer, Sylvan Lake, Canmore, Beiseker, Three Hills, Drumheller, Nanton and Diamond Valley.

Older inner-city neighbourhoods under mature tree cover — Elbow Park, Mount Royal, Renfrew, Britannia, Bowness, older Bridgeland — are the highest-maintenance environment in the region, and the strongest case for both larger trough and gutter guards. Newer suburban lots with young landscaping have the opposite problem: plenty of roof area, very little debris, and downspout extensions that were removed by the second owner.

Acreage eavestroughing is its own specification. A country home usually has a larger footprint, longer uninterrupted runs and no windbreak, which means both more water and more wind-blown debris in the system. Six-inch trough with 3x4 downspouts is the norm rather than the upgrade out there, and discharge has to be planned against the actual grade — including keeping runoff away from a septic field and clear of a well head.

We also do garages and outbuildings, which are routinely built without eavestrough at all. The result is a trench of runoff along the base of the wall, an undermined pad edge, and a lane or yard that ices over every winter where the water crosses it.