If you re insulating a cathedral ceiling and need to maintain an air sealed vent space from the soffit all the way to the ridge you could use plastic baffles stapled into place between the rafters and try to air seal them but there s a better way.
Cathedral ceiling ventilation baffles.
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This creates unique ventilation requirements.
When renovating an older home whose roof rafters are only 2x6 really 5 1 2 x 1 5 in dimension the available space for insulation and ventilation is limited therefore limiting the options for a combination of good under roof ventilation and high insulation r values in the cathedral ceiling.
Install baffles on vents.
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A vaulted roof offers open living space directly below the rafters because there are no horizontal ceiling joists.
When bob kelly of kensington nh had to insulate a cathedral ceiling he came up with a clever way of using rigid foam as his vent baffle so.
Put the baffle between the joists starting where they join at the exterior wall plate.
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If you fill a bay in a vaulted ceiling no vent is required.
Now here is the contradictory part.
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How to vent a vaulted roof.
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The air caught in the fibers is the real insulator.
Attic ventilation for cathedral and vaulted ceilings require attic baffle vents with v baffe s design you can quickly and easily retrofit cathedral and vaulted ceilings that would otherwise have been next to impossible.
This article describes the best methods for ventilation in a cathedral ceiling and the effects on heat loss of air movement through a ventilated attic or cathedral ceiling.
If you cramed a r 21 into a 2x4 bay you would not get a r21 and possibly less than r15 due to the fact that there is less air.
Best way to vent cathedral ceilings.
Also called vent chutes the baffles will make sure there is enough air flowing for ventilation needs.
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Although there is no separate attic to vent air.
Add to list click to add item ado products durovent 23 5 x 46 polystyrene attic vent chute with baffle to your list.
Vaulted and cathedral ceilings are constructed so there is no attic space between the interior ceiling and the roof deck.
That insulation works best when it expands and fills the bay.