5-Inch vs 6-Inch Eavestrough Cost Comparison in Ottawa

Six-inch eavestroughs cost roughly $2 to $5 more per linear foot than standard 5-inch eavestroughs in Ottawa, bringing the installed price from the $8 to $18 range for 5-inch K-style up to $10 to $23 per linear foot for 6-inch. On a whole-house installation of 150 linear feet, that translates to an additional $300 to $750 — a modest premium that delivers a meaningful upgrade in water-handling capacity.

The 6-inch eavestrough holds approximately 40 percent more water per linear foot than a 5-inch profile. This extra capacity matters most during Ottawa's intense summer thunderstorms, which can dump enormous volumes of water onto your roof in a short period. A 5-inch K-style gutter handles about 1.2 gallons of water per linear foot, while a 6-inch manages roughly 2 gallons per foot. When your roof drainage area exceeds the 5-inch gutter's capacity, water sheets over the front edge — a condition called overtopping — and pours down your siding and foundation instead of flowing to the downspouts.

When does 6-inch make sense in Ottawa? Several situations tip the recommendation toward the larger size. Homes with steep roof pitches (8/12 or greater) accelerate water flow, overwhelming standard gutters during heavy rain. Homes with large roof areas that drain to a single eavestrough run — such as a long rear roofline without a valley break — concentrate more water into fewer feet of gutter. Complex rooflines where upper roof sections drain onto lower sections create a compounding effect that standard 5-inch gutters struggle with. And homes in heavily treed areas like parts of Kanata, the Glebe, and Rockcliffe Park benefit from the larger trough because debris accumulation reduces effective capacity, and a 6-inch gutter with some debris still outperforms a partially clogged 5-inch.

Ottawa's heavy snow loading is another factor favouring 6-inch eavestroughs. When snow and ice accumulate on the gutter edge — as they inevitably do during our 200-plus centimetre winters — the effective water-carrying capacity of the gutter decreases. A 6-inch trough maintains better drainage even with partial ice obstruction, reducing the risk of overflow-related water damage during mid-winter thaw events.

The downsides of 6-inch eavestroughs are minor. They are slightly heavier, which means your hanger and fascia support system needs to be solid — but proper 24-inch or 18-inch hanger spacing handles the extra weight without issue. The larger profile is slightly more visible from ground level, which is purely an aesthetic consideration. And not all gutter guard systems are available in 6-inch sizes, though most quality micro-mesh and perforated cover systems offer both options.

For most standard Ottawa bungalows and modest two-storeys with straightforward rooflines, 5-inch K-style eavestroughs are perfectly adequate when properly installed with correct slope and sufficient downspouts. But for larger homes, steep roofs, complex drainage patterns, or heavily treed lots, the 6-inch upgrade is one of the most cost-effective improvements you can make to your home's water management system.

When collecting quotes from contractors, ask each one to assess whether 5-inch or 6-inch is appropriate for your specific roof drainage. A professional who takes the time to evaluate your roof area and recommend the right size — rather than defaulting to 5-inch for every job — is the kind of contractor worth hiring. You can find eavestrough professionals in your area through the Ottawa Construction Network directory at justynrookcontracting.com.