Standard roof duct penetration detail
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Architectural Details: Flashings and Copings - Roof Penetrations
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Description: The apron is cleated at its upper edge and is joined to the copper roof pans with a transverse seam. The copper base flashing extends a minimum of 6" onto the roof in all directions. Effective separation of the aluminum and the copper is provided with the use of butyl tape. The preferred method of flashing penetrations through flat roofs involves the construction of a curb around the opening.