IMPORTANT!

  • The SNOWVENTCO Upper Roof Exhaust Vent is recommended for installation on sloped roofs with a minimum 4/12 pitch and is typically installed within 2 ft of the roof peak.
  • The SNOWVENTCO Lower Roof Intake Vent should be installed a minimum 4 ft from the gable and 4 ft from the eaves.
  • Check your local building codes.
  • Do not remove hood from flange.

Getting started with SNOWVENTCO Storm Vents

STEP 1. Always check local building codes

Before you purchase or install roof vents, make sure you check all local building codes regarding correct roof vent placement for your region. Typical installation information for Ontario, Canada is provided below.

STEP 2. Plan minimum pitch

Type B box vents require a minimum 4/12 pitch on a shingled roof.

STEP 3. Plan # of vents required

  • Building code requires a minimum of 1 sq ft (144 sq in) of ventilation for every 300 sq ft of attic floor space.
  • Ventilation should be split 50/50 between intake and exhaust.
  • Each SNOWVENTCO Storm Vent (intake or exhaust) has 50 sq inches of free air flow (Net Free Area)
  • Building code requires a vapour barrier between the attic deck and the living space if there is not at least 3ft of vertical height between the intake vents and the exhaust vents.
  • Try our roof vent calculator for an estimate of the number of roof vents needed for your roof.

STEP 4. Tools Required

  • extension ladder (ensure to tie off on the roof)
  • safety harness
  • rubber sole shoes
  • claw hammer
  • shingle lifter / pry bar
  • skill saw
  • roofing nails
  • measuring tape
  • chalk line
  • level
  • roofing hook blade (to cut shingles)

STEP 5. Vent Placement

  • Exhaust vents should be installed 2 ft from the roof peak
  • Intake vents should be placed a minimum 4 ft from the gable and 4 ft from the eaves.
  • Evenly space the vents along the roof line ensuring not to cut into existing rafters.
  • Typically, vents can be discreetly placed on the backyard and garden sides of the structure. The more visible street side of the house can be left vent free.

STEP 6. Vent Installation

  • Remove the existing 50 sq inch NFA vent to be replaced.
  • Carefully lift the shingles with a flat lifter and remove existing nails with a claw hammer.
  • The attic opening exposed under the removed vent will either be an 8 inch diameter circular hole or a  7.25 x7.25 inch square opening
  • The SNOWVENTCO Storm Vent, with its extra wide flange, will cover either configuration.
  • Slide the new vent, facing up, into place over the hole, directly onto the roof deck.
  • Slide the vent flange under the existing left, right and top shingles.
  • Shingles should now cover the top of the vent flange as well as the left side and right side of the vent flange.
  • The bottom flange sits atop the lower shingles.
  • The SNOWVENTCO Storm Vent comes completely assembled with a permanently attached hood.
  • Nail the vent into place into the roof deck using the pre existing hole markers in the flange.
attic insulation damaged by moisture in attic

STEP 6. Installing the vent

  • extension ladder (ensure to tie off on the roof)
  • safety harness
  • rubber sole shoes
  • claw hammer
  • shingle lifter / pry bar
  • skill saw
  • roofing nails
  • measuring tape
  • chalk line
  • level
  • roofing hook blade (to cut shingles)

SNOWVENTCO Storm Vents

snowventco upper roof exhaust vent in black polypropylene

Upper Roof Exhaust Vent

Install near roof peak to allow warm air to escape. Blocks 99% of snow, diverts rain.

a group of three snowventco lower roof intake vents in brown, grey and black

Lower Roof Intake Vent

Suitable for use in place of soffit vents. Blocks 99% of snow, effectively diverts rain.

translucent version of snowventco storm vent to allow light into a shed while keeping rain and snow out

Skylite Exhaust Vent

Perfect for sheds and garages to allow light in while keeping moisture out.

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Frequently Asked Questions

Why do I need roof vents?
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Roof vents are necessary in order to improve the ventilation in your attic. Adequate ventilation helps to remove excess heat and moisture from your attic, which can prolong the life of your roof and prevent damage to your attic and the rest of your home. Additionally, proper ventilation can help to prevent the growth of mold and mildew, which can be a health hazard.

What is the best roof ventilation system?
arrow down to open frequently asked question

There is no one "best" roof ventilation system as the appropriate system will depend on the specific needs of your home and roof. Roof vents are generally divided into active or passive systems with each system having its pros and cons.

How many roof vents do I need?
arrow down to open frequently asked question

The number of roof vents you need will depend on the size and layout of your attic. A general rule of thumb is to have 1 square foot (144 square inches) of vent area for every 150 square feet of attic space. For example, if your attic is 900 square feet, you would need 864 square inches (6 square feet X 144) of vent area. Additionally, it's important to make sure that your vents are properly placed and balanced, with an equal amount of intake and exhaust vents. This will ensure that air is flowing effectively through your attic and not creating pressure that could cause leaks or damage to the roof. Try our roof vent calculator to find the right amount of vents for your roof.

How Do I Install SNOWVENTCO Storm Vents?
arrow down to open frequently asked question

Installing roof vents can be a complex task that requires a certain level of skill and experience. It is recommended that you hire a professional roofing contractor to install your vents, as they will have the knowledge and tools necessary to do the job safely and correctly. However, if you're determined to install them yourself, take a look at our installation video for a step by step demonstration.

Can raccoons, squirrels, or other rodents chew through the vent and gain entrance into my attic?
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No, determined vermin will have a difficult time chewing through the heavy duty plastic outer shell which is much thicker than typical roof vents. If they are able to chew through the plastic they will not be able to get through the stainless steel filter. This will restrict attic access through the vent openings.

Can roof vents breathe under snow?
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Roof vents can breathe under snow, but it depends on the amount of snow and the type of vent. SNOWVENTCO Storm Vents have been tested to allow for airflow even under heavy snowfall conditions. See the link below for video proof.

Will SNOWVENTCO Storm Vents perform well under high wind conditions?
arrow down to open frequently asked question

Yes, the low profile and aerodynamic design of SNOWVENTCO vents combined with heavy duty polymer outer shell mean the SNOWVENTCO vents are very resistant to high winds. Our vents have undergone testing showing that they prevent over 99% of rain, snow, and other particle penetration of attic in CAT 3 hurricane wind conditions. They are also durable enough to stay intact when faced with 120 mph winds.

Still have questions?

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Keep Your Attic Dry

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30 day
MONEY BACK
GUARANTEE
30 YEAR
WARRANTY
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SHIPPING

in CANADA &
CONTINENTAL USA