Installing the WeatherPRO® PRO50 Roof Vent

Proper roof ventilation is essential to prevent moisture in your attic. This can lead to mould build-up, and damage to ceiling insulation and coverings. The best way to protect your home is with prevention.


With the WeatherPRO® Series, you can rest assured that your roof vent promotes proper airflow in your attic space, even in extreme weather. The unique baffle system and flat exterior walls are designed to ward off wind-driven snow and rain, so you can maintain air circulation and steady temperatures in your home year-round.

The plastic design of the WeatherPRO® PRO50 Roof Vent makes it more lightweight, and is easier to install. Below is a step-by-step installation guide to setting up the roof vent for new construction or when re-roofing.

Please note: the installation of Duraflo® WeatherPRO® PRO50 Roof Vent should comply with all local standards and regulations. Before beginning a job, determine how much ventilation is required in both soffit and roof vents, and the appropriate size of vent that would best suit the job. If required, refer to Duraflo® Ventilation Calculator for guidance.

Installing the WeatherPRO® PRO50 Roof Vent

  1. Determining the location of the vents:

    Evenly space the vents along the width of the roof, marking the location of all roof vents before cutting the holes. Centre the holes between the rafters within two feet (24″ or 61 cm) from the peak of the roof.

    Cut and prepare the opening:

    Cut the holes in the sheathing before applying the shingles: cut a 6 ½” x 8 ½” (16.5 cm x 21.6cm) opening. Shingle up until the first full course of shingles covers the bottom of the hole. Cut the excess shingles away from the hole.

  2. Position the vent and nail the vent in place:

    Duraflo® Roof Vents have a top arrow indicator. Make sure the throat of the vent is in the proper position, centered over the opening. Using the pre-marked nail holes, nail the vent securely into place.

  3. Complete the shingle installation:

    Continue installing the shingles, overlapping the flange of the vent. Cut the singles around the top of the vent to match its shape.

3 steps to install Duraflo WeatherPRO PRO50 Roof Vent

Caution: DO NOT USE roofing cement / roofing tar to seal the vent to the roof. The wide flange and moulded-in water guards will force the water down the roof over the shingles. The polypropylene flange is large enough and flexible enough to effectively self seal against the roof without the aid of roofing tars. Roofing tars are potentially damaging to the roof vent and the asphalt shingles. Use of roofing tar will void any warranty on the Duraflo® Roof Vents.

Optional: Seal all nail heads with an approved sealant, such as silicone. make sure the sealant is non-petroleum product (usually available in a plastic tube).

Duraflo® WeatherPRO® PRO50 Media Gallery

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