Sloped roof duct penetration detail
9.9. Roof Penetrations
Description: A copper sleeve is soldered to the base flashing. The horizontal portion is nailed to wood blocking or to a nailable deck. Copper flashing laps over the composition flashing a minimum of 4". The shingles, slate or tile are placed over the flashing on the upper and two sides and slipped under the lower edge of the flashing.