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I am currently insulating a new room in my house. I am planning to put up a drop ceiling. I have insulated between my roof trusses. Do I need anything else between my drop ceiling and attic space other than insulation. I thought of putting either drywall or plywood but not sure if I need it or not.

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Drop Ceiling = massive air leak through all the seams. Having a sealed air envelope is a major step towards heating efficiency. Plasterboard with sealed joints will always be more efficient as it allows you to trap the heat and control air egress instead of chimneying it out through all the cracks. See if some sort of vapor barrier can be used over the ceiling tiles and tee bar under the insulation to cut down on the air flow. – Fiasco Labs Jan 26 at 19:17

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