Should eavestroughs wrap around the entire perimeter of my Ottawa home or just certain sides?

Great question, and the honest answer is: it depends on your roof design, drainage area, and how water flows off your specific home — not a one-size-fits-all rule. Most Ottawa homes do not need eavestroughs on every single edge, but getting the coverage right is critical given our climate.

Understanding Where Eavestroughs Actually Need to Go

The fundamental purpose of an eavestrough system is to collect water at the roof's drip edge and direct it safely away from your foundation. That means any roof edge where water runs off in meaningful volume needs a gutter. On a standard gabled roof — the most common style in Ottawa — this typically means the two long eave sides of the house, with the triangular gable ends left open because water sheds off the sides rather than dripping from those edges.

Where it gets more complex is with hip roofs, which are increasingly common on newer Ottawa builds in areas like Barrhaven, Kanata, and Orleans. A hip roof slopes on all four sides, meaning all four edges produce runoff and generally all four sides require eavestroughs. Dormers, additions, and attached garages add further complexity, as each roof plane that drains onto a lower roof or directly to grade needs to be evaluated individually.

The north-facing sides of Ottawa homes deserve special attention. Because they receive less direct sunlight, snow and ice linger longer on north-facing eaves, creating more severe ice dam conditions and heavier loading on the eavestrough system. Some Ottawa homeowners and contractors choose to install heavier 0.032-inch gauge aluminum on north exposures specifically for this reason, even if the south side uses standard 0.027-inch material.

From a practical standpoint, any roof edge that sits within 1.8 metres of your foundation — the minimum discharge distance required under the Ontario Building Code — needs either a gutter with a downspout or a graded splash pad that moves water well clear of the house. Ottawa's clay-heavy soil drains poorly, and even a modest roof section dumping water against your foundation repeatedly will eventually cause basement moisture problems. This is not a theoretical risk in Ottawa; it is one of the most common causes of wet basements in older neighbourhoods like Hintonburg, Vanier, and Alta Vista.

One area homeowners sometimes overlook is valley drainage — where two roof planes meet and funnel concentrated water flow. If a valley dumps onto a lower roof section that then drains to an unprotected edge, that lower edge absolutely needs a gutter sized to handle the combined volume. During Ottawa's heavy summer thunderstorms, which can drop 30 to 50 millimetres of rain in under an hour, undersized or missing gutters at these high-volume points overflow quickly and cause real damage.

A practical tip: on your next rainy day, walk around your home and watch where water actually hits the ground. Any spot where you see water splashing within a metre of the foundation, eroding soil, or staining the siding is a location that needs eavestrough coverage or improved downspout discharge. This simple observation tells you more than any diagram.

Cost-wise, adding coverage to a previously unprotected roof edge in Ottawa runs $8 to $18 per linear foot for seamless aluminum installed, plus $200 to $600 per downspout. Getting a contractor to assess your specific roof geometry before deciding on coverage is genuinely worthwhile — a 20-minute site visit can save you from either over-installing unnecessarily or missing a critical drainage point.

You can browse eavestrough contractors serving Ottawa through the Ottawa Construction Network directory at justynrookcontracting.com — it's a free resource to find and contact local professionals who can assess your home's specific layout and give you written quotes.