How to Install a Strip of Circular Soffit Vents

One of the best ways to ensure your home has good ventilation is to install a strip of circular soffit vents. Attic ventilation is necessary to reduce utility bills and to ensure your roof will last a long time. Plus, with the correct ventilation in place, your home will suffer less natural weather damage than a home with inadequate ventilation. Follow these steps to install a strip of circular soffit vents.

You Will Require:

  • Circular Soffit Vents
  • Hammer
  • Screws
  • Drill
  • Saw
  • Roofing nails or screws
  • 1-inch-by-4-inch strapping boards
  • Silicone sealant

Step 1 -- Marking off the Strips

In order to install circular soffit vent strips, determine in advance where you will be locating them along the soffits. Mark an “X” between the studdings where you wish the strips to start and stop. Take a chalk line and run a line 2 inches from the edge of the soffit and another 4 inches from the first 2 inches of chalk line. This will leave you with adequate spacing to install the strips.

Step 2 -- Cutting Soffits for Circular Soffit Vent Strips

Once you have drawn your chalk lines, use a circular or reciprocating saw to cut through the soffit in a shallow cut. Use a hand saw to make the end cuts in the marked area, as you will have a little more control than with a power tool. Once you have cut the hole, attach the strip of vents to the soffit, using the screws that came with the vents and a screwdriver. Place the screws approximately 12 to 16 inches apart.

Step 3 -- Installing the Strips

After preparing your cuts, go to the attic and remove any attic insulation that will be in the way when installing your vent strips. Next, nail in your 1-by-4-inch nailer between the rafters to keep the insulation held back from the track where the soffit vents will be installed. If insulation settles over any of the installed vents, it will block air intake and defeat the purpose of installing the circular soffit vent strips.

Step 4 -- Creating an Airflow

To create airflow between the rafters and the underside of the roof, install baffles, which will channel the air upward toward the roof’s ridgeline. If you measure the airflow and it seems inadequate, then the possibility is that you also require ridge vents to vent the air out of the attic. If this is required, you need to purchase them and follow the manufacturer’s directions to install the ridge vents properly.

Step 5 -- Sealing the Circular Soffit Vent Strips

Like individual circular soffit vents, circular soffit vent strips require silicone to ensure that they are held down airtight against the elements. Not only does this provide your vent a better draw of air, but it also keeps pests like wasps and small insects from entering your attic and building nests, which will be costly if an exterminator is required to remove them.