One-piece sill pan flashing

A one-piece, laterally adjustable sill pan flashing installable in one piece in a framed opening, where the framed opening includes opposite side frame members and a sill plate member extending between the side frame members, which comprises,

• a sill plate cover including an inclined upper portion, extending downwardly and forwardly and configured to extend over a top of the sill plate member, and a vertical front portion extending downward from a front of said inclined upper portion,
• said sill plate cover including one or more width adjustable accordion sections and connecting panels connected to lateral edges of said one or more accordion sections,
• said accordion sections and said connecting panels each comprising inclined upper portions and vertical front portions,
• the inclined upper portion of said sill plate cover comprising a forward portion and a rearward portion, said rearward portion being elevated with respect to said forward portion, and upper portions of said connecting panels being formed with an abrupt rise from forward portions of said connecting panels to elevated rearward portions thereof,
• upper and front portions said one or more accordion sections comprising a plurality of V-shaped elements defining successive ridges and valleys,
• said accordion section front portions being positioned such that the valleys thereof lie substantially in a plane defined by vertically extending connecting panels included in the vertical front portion of said sill plate cover, whereby ridges of said accordion section front portions extend forwardly from the vertical front portions of said connecting panels,
• accordion section rearward portions included in the rearward portion of said inclined upper portion of said sill plate cover being positioned such that ridges of such accordion section rearward portions lie substantially in a plane defined by adjacent connecting panels of the rearward portion of said inclined upper portion, whereby the ridges of said accordion section rearward portions are substantially aligned with said adjacent connecting panels and the valleys of said accordion section rearward portions extend downwardly from said adjacent connecting panels.