Roof flashing for a pipe or duct

Abstract

The invention relates to a flashing for a pipe or duct passing through a seamed roof. The flashing comprises a collar at the upper end of which is provided an opening for the pipe or duct, and a substantially flat flange to which the lower end of the collar is joined, which flange is configured to be attached to a portion of a roof, whereby a plane through the upper and lower edges of the opening in the upper end of the collar is set inclined by an angle in a range between 25° and 35° relative to the plane defined by the flange. The opening at the upper end of the collar has an oval or oblong shape, facilitating the use of the flashing at various roof pitch angles without the collar being modified.

1 . A flashing for a pipe or duct leadthrough for use on a seamed roof, comprising:
 a collar having at its upper end an opening for the pipe or duct, the opening having an upper edge at the side of the roof ridge and a lower edge at the side of the eave, and   a substantially planar flange adapted for fastening to a roof section, said flange defining a plane,   
       wherein a plane through the upper and lower edges of the opening (A-A) is set at an angle (α) relative to the plane (B-B) defined by the flange, said angle (α) being in the range 25 to 35 degrees; and the projection of the opening into the plane through the upper and lower edges of the opening is oblong. 
     
     
         2 . The flashing according to  claim 1 , wherein the angle (α) is 30 degrees. 
     
     
         3 . I e flashing according to  claim 1 , further comprising having a raised portion on the flange at the side of the roof ridge, providing a groove between the raised portion and the collar. 
     
     
         4 . The flashing according to  claim 1 , further comprising having a seal of thermoplastic polymer on the undersurface of the flange. 
     
     
         5 . The flashing according to  claim 4 , wherein the width of the seal is greater at the edge facing the roof ridge than at the other edges.