If you re insulating a ceiling and need to maintain an air sealed vent space from the soffit all the way to the ridge you could use plastic vent baffles stapled into place between the rafters and try to air seal them but there s a better way.
Foam attic air baffles.
An attic baffle is simply an item to regulate the flow of air aka required roof venting and impede it the insulation from interfering with each other.
Baffles are also called wind baffles venting chutes rafter vents or insulation baffles.
Attic baffles how they work.
They also keep insulation from falling into and clogging up the eaves.
Attic baffles also called channel vents vent chutes proper vent and about 50 other names help direct air flow from the soffit through the attic.
They can reduce roof deck temperature minimize ice dam issues and can help control attic moisture.
Baffles provide a channel for air to flow through certain parts of the attic.
From left to right air flows through the soffit vents up over the baffles allowing for the required roof venting.
Learn bob kelly s method of using rigid foam for his vent baffles.