Foldable and expandable pitch pocket and method of forming same

摘要

A foldable and expandable pitch pocket for encompassing an element such as a vent pipe protruding from a roof structure. The pitch pocket is initially an elongated piecepart which is arranged with slits on a horizontal wall and notches on the vertical wall aligned with the slits, thereby making it feasible to use light hand pressure to bend creases in the vertical wall to obtain the folded pitch pocket. A slot and tab cooperatively arranged interlock the vertical wall to fixedly hold the folded shape of the pitch pocket.