Insulating Cathedral Ceiling

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Old 01-28-02, 05:08 PM
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Insulating Cathedral Ceiling

Does anyone have any tips for insulating a cathedral ceiling. There will be no vent between the ceiling and the roof; do I need to leave air space between the insulation and the roof or can I use insulation that fills the whole space?
 
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Old 01-30-02, 12:23 AM
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Insulation values differ from region to region. Check with the local building department for your area. It is necessary to leave at least a two inch air space between the insulation & the roof sheathing to allow proper ventillation & prevent the sheathing from rotting. You will need to have vented soffits and a ridge vent to allow air to enter & exit this area, when you insulate ensure you do not block the soffits. The rafters may have to be built up with 2x2 to accomodate the required insulation thickness & keep the air space. Using batt insulation the order from top down is, roof sheathing, air space, insulation, vapour barrier, drywall. Ridgid polystyrene can be used in place of batt insulation & serves as its own vapour barrier.
 
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