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My question is regarding insulation and chimneys. As code requires a 2″ airspace between combustibles, such as where the chimney passes through the ceiling and the roof, it is unclear about whether the chimney can be in contact with insulation within the attic. One proposal was to use batts of rock wool insulation, which is non-combustible, but I have yet to find a source for this.
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To prevent moisture buildup and improve performance, install a continuous air barrier—such as drywall or specialized membranes—under tongue-and-groove boards or other interior wall paneling.
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My question is regarding insulation and chimneys. As code requires a 2" airspace between combustibles, such as where the chimney passes through the ceiling and the roof, it is unclear about whether the chimney can be in contact with insulation within the attic. One proposal was to use batts of rock wool insulation, which is non-combustible, but I have yet to find a source for this.