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attic was finished, but no ventilation between ceiling and roof....

attic was finished, but no ventilation between ceiling and roof....

Old 06-27-05, 07:03 AM
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Question attic was finished, but no ventilation between ceiling and roof....

Hi! I have just bought a house that had an attic that was unfinished (presumabley) at some point, then it was finished, and drywall was used to form the ceiling. There is soffit vents under the eves, but no other form of ventilation in the roof now (between the ceiling and the roof). My question is, would a ridge vent be sufficient ventilation, or should I put in some kind of fan - my concern is the framework in between the ceiling and the roof - I imagine that there would be very little air movement between the bits of wood? Any thoughts or suggestions would be most welcome.

Old 06-28-05, 12:12 PM
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First I would need to know how much ridge you do have and the estimated SF of your attic. If there isn't enough ridge to vent your attic, "whirlybirds" are fairly easy to install. A larger louver is ideal if you don't mind the look. I would stay away from the powered ventilators. They tend to be unreliable.
Old 06-28-05, 02:38 PM
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It sounds like you are describing a vaulted ceiling application, inwhich case turbine vents, powered vent or gable/louvered vents would not apply. A continous ridge vent would be the best option.

If they performed a perfect insulation application (no void spaces for air to travel) It will be inneffective. All that is needed is a 1" space between the decking and insulation. Several municipalities and code bodies are currently updating the codes to require a 1:150 ratio. others are still at 1:300. Thats 1 sq ft of net free vent area (intake + exhaust = NFVA) for every 300sq ft of attic floor space.

No real good answer here, A small section of ceiling removed (possibly in a closet or other inconspicuous place) to see what is there will tell you alot more about your options.

Good Luck!

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