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I am looking at duplex repairs. There is no fire blocking where the prefab fireplace chimney intersects the attic.These were built in the 70's. Fire blocking was not a code requirement until 1992. At that time, was the insulated triple wall pipe safe to put combustible material against? Can Sheetrock be used?
 

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Sheet metal firestops, flue collars, etc., exist for passing metal flues through wall and ceiling penetrations. Many of them are attractively made for nice interiors. Look up your local codes to find current requirements.
 
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