Ensuring Proper Ventilation with New Fire Codes

Do not get burned by updated fire codes!

Over the past few years, the fire codes for new home construction and soffits have been updated to combat the spread of flames between neighbouring buildings* where if

  • the exposing building face has a limiting distance of 0.45 m or less, projecting roof soffits shall not be constructed above the exposing building face; [1]
  • the exposing building face has a limiting distance of more than 0.45 m, the face of roof soffits above the exposing building face shall not project to less than 0.45 m from the property line; and [2]
  • the roof soffits project to less than 1.2 m from the property line, the centre line of a lane, or public thoroughfare or an imaginary line between two buildings or fire compartments on the same property, they shall have no openings and be protected. [3]

Soffits are intake vents that bring air in from the outside. Soffits reduce moisture levels by allowing air circulation within a roof space. Without proper ventilation, heat and moisture can build in the attic and provide the ideal conditions for mold and mildew to grow. This can ultimately impact the integrity of the roof and shingles!

How do you ensure proper attic ventilation in a new home while meeting updated fire regulations?

The engineers at Duraflo® designed the WeatherPRO Slantback (PROSlantBack) Roof Vent with these conditions and fire codes in mind.

“Regular vents were designed to allow air to flow out, but when you reverse this process you need to be concerned about drawing in the weather, namely snow.* Unlike regular vents, the Duraflo® PROSlantBack was designed as both an intake and exhaust vent, allowing you to properly vent the attic while also protecting the space from the elements.”

Bill Gay, Western Region Sales Rep, Duraflo®


Diagram of air flow through the WeatherPRO Slantback roof vent vs. other vents

The Duraflo® WeatherPRO® Slantback several features which make it suited for use as an intake. The elongated design of the vent requires air to travel through a series of the vent’s internal components before reaching your attic. The large grill opening on the front allows the vent to draw air from the bottom. The air then flows through the bug screen, past the patented weather baffle system, and finally through the opening. This allows for better protection for your home from weather infiltration. The extended slant back design at the top of the vent has the lid attached directly to the roof sheathing.

In the event heavy snow or ice slides down the roof, it will slide over the vent. This will prevent the ice or snow from dislodging or removing the vent from the roof.

When fire code prevents conventional soffit installation, the Duraflo® WeatherPRO® Slantback provides the solution!

*Fire code specifics may differ on a province-by-province basis.

[1] National Building Code 2010 Division B Article

[2] National Building Code 2010 Division B Article

[3] National Building Code 2010 Division B Article

Duraflo®WeatherPRO® Slantback Media Gallery

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