Roof Vent Installation in Toronto & the GTA

An attic that hits 60 degrees in July and grows frost on the nail tips in January is telling you the same thing both times: air isn't moving through it. Under-venting cooks shingles from below, shortens their life, soaks insulation with winter condensation, and feeds ice dams. Most older GTA homes were built with less attic vent area than they need — some with almost none.

Ventilation is a pair, not a part. Exhaust up high — a ridge vent or box vents near the peak — only works when soffit intake down low feeds it. Add exhaust without intake and the attic pulls air from the house instead, which makes the moisture problem worse. Mixing vent types on one slope can short-circuit the flow too, so sometimes we remove vents rather than add them.

We quote from measurements, not habit: attic floor area against the net free vent area you actually have. Sometimes the fix is a ridge vent cut-in; sometimes it's clearing soffits that were stuffed with insulation forty years ago, which costs far less. And if your venting is already adequate, we'll say so and save everyone a morning.

• Attic inspection measuring existing intake and exhaust against the attic floor area
• Ridge vent cut-in with external baffles, capped to blend with the shingles
• Box vent (roof louvre) installation, flashed under the uphill shingle courses
• Turbine vent replacement, or removal where mixed vents are short-circuiting airflow
• Sealing and shingling over redundant or broken old vents
• Baffles at the eaves so insulation can't choke the soffit intake
• A check that bathroom and kitchen fans duct outside — not into the attic you're trying to vent

• How many vents your attic area actually calls for, and what type
• Ridge length available — short or hipped ridges limit ridge venting and push the design toward box vents
• Roof pitch and height, which set the access and safety effort
• Whether soffit intake exists, or has to be created or unblocked first
• Shingle age — brittle shingles make clean cut-ins slower
• Old vents that should be removed and roofed over rather than left as leaks-in-waiting

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.