How Passive Roof Vents Can Help Your Home

Passive roof vents provide ways for stale, moist air to escape from your roof.  According to Houselogic, "vents encourage natural air flow and work without the aid of motorized fans."

Here is an overview of roof vents courtesy of Houselogic:

How much roof ventilation?

The rule of thumb for proper attic ventilation calls for a minimum of 1 square foot of vent area (openings) for every 300 square feet of attic floor space. If you have asphalt shingles, you must have some kind of attic ventilation or you’ll risk voiding the warranty.

Check your roof vents

You or a professional roofer should check your roof vents annually.

  • Periodically clear vent screens of dirt, leaves, dust, pollen, spider webs, bird nests, and other debris that impedes air flow.
  • Repair screen rips or tears and damaged flashing.
  • Check for rust or rot around the framing or flashing.
  • Clear insulation from soffit vent openings. You’ll need to inspect from inside your attic. Make sure attic insulation stops clear of the under-eave area.

If you’re having problems with ice dams, mold, and damaged shingles, have a ventilation or roofing professional evaluate whether you have adequate ventilation and need to retrofit exhaust or intake vents.

Roof vent options

  • Ridge vents run along the peak of the roof. They feature an external baffle to increase air flow and protect your house from snow, rain, and dust. They’re usually capped with a material that blends in with the roof. It costs about $245 for a professional to install a 40-foot ridge vent.
  • Static vents have no moving parts. They’re basically protected holes in the roof that allow air circulation. They come in various designs—roofline, dormer, roof louver, or eyebrow vents—and are installed in an even line across the roof. Some pros swear by them; others think they tend to leak. They cost between $35 and $50 per vent to install.
  • Gable vents, or wall louvers, are placed in the gable ends of the attic and can be used in combination with other vents. The higher they are, the more effective. However, the airflow from gable vents is limited because they’re under the roof deck, resulting in hot spots. Professional installation costs about $185 per vent. Or, buy a set yourself and install them for $45 apiece.
  • Wind turbines are mushroom-shaped caps atop roofs designed to catch natural wind currents, which spins an internal fan and propels hot air out of the attic. Wind turbines are most effective in areas where winds average about 5 mph.

Exterior Specialties of PA is here to help with all of your roofing maintenance, roofing repair, and roofing maintenance needs. Call us today at (215) 773-9181 for a FREE estimate!

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