cathedral ceiling insulation


Old 03-28-01, 11:27 AM
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We are renovating an old building to live in as a loft space. We therefore want to keep the ceiling open - cathedral. The roof rafters are 2x6, so we only have 6" between the roof boards and the interior ceiling. What is the best method to insulate? What about a vapor barrier? The interior roof will be V-board not drywall. We looked into the exterior insulated panels - too expensive to have installed.
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Old 04-04-01, 01:21 PM
Eric L
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We recently did the same type of thing in my brothers attic. He has 2x6's. We bought extra 2x4's and sistered them edge to edge with the 2x6's. This got us close to 2x10's. This way we could get the insulation up to R-30. We tacked some scrap plywood pieces on each side of the studs to hold them together. The insulation we used had the Kraft face for the vapor barier. We did leave a small flat area on the top of the peak for air to flow through.
Old 04-05-01, 04:41 PM
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Eric is right. You need R-30 for this kind of ceiling. If you are limited by the height or don't want to add 2x4s, you can use rigid unsulation. It costs more than batt insulation.

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