How can you tell if your soffit is vented?
Short answer. From the ground, vented soffit shows rows of small perforations in vinyl or aluminum panels, a continuous strip vent along the eave, or rectangular or round vents cut into wood soffit; solid panels and plain painted boards are unvented. To be sure air actually gets through, check from the attic for daylight or open baffles at the eaves.
What vented soffit looks like
- Perforated vinyl or aluminum: panels with a pattern of small holes, either across the whole panel or in a center band.
- Continuous strip vent: a narrow metal strip with louvers running the length of a wood soffit.
- Undereave vents: rectangular louvered vents, often about 16 inches long, spaced between rafters.
- Round plug vents: small circular vents drilled into soffit or blocking.
Look closely, it can fool you
- Vinyl soffit is often installed over the old plywood soffit. If no openings were cut in the plywood, the perforated vinyl is vented in appearance only.
- Some homes alternate vented and solid panels, which may or may not supply enough intake.
- Paint can clog perforations and strip vents.
Confirm from the attic
- On a bright day, turn off the attic light and look toward the eaves.
- Daylight at the edges, or open baffle channels, means air can get in.
- Insulation packed against the deck at the eaves means it is blocked, even with vented panels outside.
The quick outside test
Shine a bright flashlight up through a perforated panel at night. If you see wood immediately behind it, the backing was never opened.
Next steps are in roof ventilation basics and roof anatomy explained.