Jamb flashing

1. A jamb flashing which includes a first plate, a second plate lying in a plane coplanar with that of the first plate, and a flange the plane of which is substantially perpendicular to the plane of the first and second plates; said first plate having a first longitudinal edge which is upturned to lie at an acute angle to the plane of said first plate, and a second longitudinal edge which is rigidly secured to the lower edge of said flange; said second plate having a first longitudinal edge which is rigidly secured to the lower edge of said flange and a second longitudinal edge which is upturned; said flange, said upturned first longitudinal edge of said first plate and said second longitudinal edge of said second plate all projecting from the same side of the jamb flashing; the upper edge of said flange being substantially further away from said first and second plates than either said first longitudinal edge of said first plate or said second longitudinal edge of said second plate; and the second longitudinal edge of said second plate projecting above the plane of the second plate no further than said first longitudinal edge of said first plate.

2. The jamb flashing as claimed in claim 1 , wherein said first and second plates and said flange are integrally formed.