Question 1

Should the bathroom exhaust go through the roof in Calgary?

Accepted Answer

Bathroom exhaust ventilation is mostly a mechanical and building-code question rather than a roofing one, so this sits at the edge of Roof IQ's scope. The short roofing answer: yes, routing the duct through the roof is a common and generally acceptable termination point in Calgary, but the penetration itself matters a great deal to your roof's performance.

The Roofing Part That Matters

When a bathroom exhaust duct exits through the roof, it needs a proper roof vent cap, and the flashing aroun

Question 2

How much attic ventilation does a Calgary house need?

Accepted Answer

Attic ventilation in Calgary is governed by the National Building Code – 2023 Alberta Edition, which sets a minimum vent area of 1/300 of the insulated ceiling area for most houses with a conventional attic. If the roof has a low slope or the rafters double as the ceiling joists (roof-joist construction), that ratio drops to 1/150 because air moves less freely in those assemblies.

How the 1/300 rule works in practice

Take a house with 150 square metres of insulated ceiling. Divide by 300 and

Question 3

Why does my roofer talk about intake and exhaust balance in Alberta?

Accepted Answer

Balanced attic ventilation is one of the most important factors in how long a Calgary roof lasts, and it matters more here than in most Canadian cities because of the freeze-thaw cycle.

What intake and exhaust actually do

Your attic needs a continuous flow of outside air: cool, dry air enters low at the soffits (intake), travels across the attic floor, picks up heat and moisture, and exits high at the ridge or through roof vents (exhaust). When those two sides are balanced, the attic stays cl

Question 4

Is my Calgary attic too hot in summer?

Accepted Answer

A Calgary attic that hits 60°C or more on a hot July afternoon is running too hot, and that heat is doing real damage to your roof from the inside out.

What an Overheated Attic Does to Your Roof

Shingles are designed to shed water and resist hail, but they rely on a reasonably stable temperature underneath. When attic air stagnates at extreme heat, the underside of the sheathing cooks, the adhesive strips on shingles soften and lose grip, and the shingles themselves age faster. In Calgary's c

Attic Ventilation & Ice Dams

Should the bathroom exhaust go through the roof in Calgary?

How much attic ventilation does a Calgary house need?

Why does my roofer talk about intake and exhaust balance in Alberta?

Is my Calgary attic too hot in summer?