Soffit Vent

Attic ventilation works as a two-part system, drawing cooler outside air in low on the roof and letting hot, humid air escape higher up. Soffit vents are the intake side of that system, built into the underside of the roof overhang where fresh air can be pulled in.

They show up in two common forms: individual round or rectangular vents punched into separate soffit panels, spaced evenly along the eave, or a continuous perforated soffit panel that vents along its entire length instead of at intervals.

Either style depends on a clear path for that air once it gets past the soffit. Insulation piled against the roof deck at the eave, or baffles that are missing or crushed, can block the airflow before it ever reaches the open attic.

That intake air is what makes an exhaust vent, like a ridge vent, actually work. A ridge vent with no functioning soffit intake has nothing pulling fresh air behind it, and the attic stays stagnant no matter how good the exhaust vent is.

Soffit vents also need to stay clear from the outside. Paint clogging the perforations, insulation stuffed against them from inside, or debris packed into individual vents all choke off the intake even when the vent itself looks intact.

For a homeowner, checking that soffit vents are actually open, both from the outside and from inside the attic, is a simple way to confirm the ventilation system is doing its job.

A vent that looks fine from the driveway can still be blocked from behind by insulation, which is why the inside check matters as much as the outside one.