Correct Placement of Roof Vents

According to The Family Handyman, correctly placed roof vents can reduce cooling bills in the summer and prevent roof rot and ice dams in the winter. This renovation project takes only a few hours and is cheaper than the cost of repairs from not having proper roofing ventilation. Types of vents include ridge, gable and soffit. According to Check This House, you need 1 square foot of venting per 150 square feet of attic space.

A roof without vents can act as a solar oven in the summertime.
  1. Plan the placement of your roof vents. In your attic, examine the peak of your roof and mark the spots where you want to place vents. Placement depends on the type of vents you are using. Ridge vents run the length of the roof peak, 150 feet apart. Gable vents are placed about 1 foot below the peak of the roof, above any windows. Soffit vents are placed 6 inches apart below the roof line on the underside of the eaves.

  2. Mark your vent spots with measuring tape and chalk. Draw an outline of the cuts you will be making 1 inch smaller than the vents. You can trim the space to fit the vents but cutting too large will ruin the project.

  3. Cut the ventilation holes with your jigsaw. Do this slowly, as cutting through roof tiles can be tough, and slipping with your saw can cause you to injure yourself.

  4. Size your vents to the holes you cut and determine how much larger the hole should be. Use your saw and sandpaper to cut or wear away any excess wood so the vent fits.

  5. Install the vents into the new holes and secure them to the roof with screws. The vents should fit snugly into the holes with very little space between the vent and the wood.

  6. Secure your roof interior by caulking around the edges of the vent and the roof hole so air can escape only from the vents.


  • Install roof vents early or late in the day, because your attic and roof will be quite hot from the sun during the middle of the day, making it difficult to work.
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