Air holes in insulated open beam ceiling?

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Old 07-29-16, 02:14 AM
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Air holes in insulated open beam ceiling?

When you insulate an open beam ceiling and finish it with plastic sheeting and drywall, must you have ventilation with 2" air gaps between the roof and the insulation and air holes leading out of the ceiling into the attic? I'm in Southern California so there's not really any extreme temperature lows in the first place.
 
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Old 07-29-16, 02:37 AM
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Not clear on the type of ceiling/roof you are referring to. There should be no infiltration of air from the living side into the attic. Two separate atmospheres. Can you post pictures of the room(s) you are working on?
 
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Old 07-29-16, 11:36 AM
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Exposed 2 X 6 beams
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Old 07-29-16, 11:58 AM
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Hi Andy,
I see the open beam ceiling. I would expect insulation above that drywall with an air gap above that to allow air flow from soffit vents up to a high vent. But I have no explanation as to what is above what we see.

Also, in a hot climate if you use a vapor barrier it would go to the hot side to keep warm humid air from reaching your cool drywall.

Not sure what you are asking about holes.

Bud
 
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Old 07-29-16, 01:31 PM
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Must I have some gap between the insulation and the ceiling? An inch or two? Or is it OK if there is no space at all? Just packing as much rigid insulation as possible? I already finished one room with no space. Another room I finished with maybe about an inch of space. If moisture is blocked by painted drywall or a plastic sheet then I don't see why it would be a problem.

And do I need air holes at the high point, leading out of the compartments to the attic or somewhere else?
 
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