One-Piece Roof Flashing

Abstract

An integral one-piece roof flashing for preventing moisture from passing between a vent pipe and a roof. The flashing, preferably of plastic, includes a base having an aperture and a laterally-extending planar flange with a raised center portion. An upstanding outer sleeve is joined to the center portion by a flexible corrugated portion of the flashing. A downwardly-depending inner sleeve has a top end joined to the distal end of the outer sleeve, extends into the outer sleeve, and is adapted for receipt into the top end of the vent pipe. The corrugated portion flexes to allow the outer sleeve to be angled up and down the pitch direction of the roof, side to side, and to extend to accommodate different roof pitch angles and vent pipe heights. A scale on the base allows the vent pipe height to be measured to ensure that it is within acceptable limits.

1 : An integral one-piece roof flashing for preventing moisture from passing between a vent pipe and a roof where the vent pipe passes through the roof at a vent pipe angle with respect to an upper surface of the roof, said roof flashing comprising:
 (a) a base plate having an aperture therethrough and including a laterally-extending planar flange around said aperture;   (b) an upstanding outer sleeve defining a first longitudinal passage therethrough, said outer sleeve having a proximal end and a distal end;   (c) a corrugated portion defines a second longitudinal passage therethrough, said corrugated portion flexingly and sealingly joining said proximal end of said outer sleeve to said base plate about said aperture with said corrugated portion being intermediate said base plate and said proximal end of said outer sleeve; said aperture, said second longitudinal passage, and said first longitudinal passage being adapted for mutually receiving said vent pipe thereinto with said planar flange resting upon the upper surface of the roof with said corrugated portion flexing to align said outer sleeve at the vent pipe angle with respect to said planar flange;   (d) a downwardly-depending inner sleeve having a top end integrally and immovably joined to said distal end of said outer sleeve; said inner sleeve being adapted for being received into a top end of the vent pipe with said planar flange resting upon the upper surface of the roof.   
     
     
         2 : The roof flashing as recited in  claim 1 , in which said roof flashing is made from a plastic. 
     
     
         3 : The roof flashing as recited in  claim 1 , in which said corrugated portion includes a bottom corrugation that defines a bottom corrugation plane, said bottom corrugation plane establishing a starting angle orientation of said outer sleeve with respect to said planar flange, said starting angle orientation being defined as a planar angle between said bottom corrugation plane and said planar flange, such that said outer sleeve may move through a first range of angles, about said starting angle orientation from a backmost angle to a frontmost angle, as said corrugated portion flexes front to back. 
     
     
         4 : The roof flashing as recited in  claim 3 , in which said roof flashing is made from a plastic. 
     
     
         5 : The roof flashing as recited in  claim 4 , in which said backmost angle is at least +45 degrees with respect to said starting angle orientation, and said frontmost angle is at least −45 degrees with respect to said starting angle orientation. 
     
     
         6 : The roof flashing as recited in  claim 3 , in which said backmost angle is at least +45 degrees with respect to said starting angle orientation, and said frontmost angle is at least −45 degrees with respect to said starting angle orientation. 
     
     
         7 : The roof flashing as recited in  claim 1 , in which said planar flange of said base plate includes measurement indicia thereon for measuring the vent pipe to ensure that the top end of the vent pipe is within a minimum and maximum length above the upper surface of the roof 
     
     
         8 : The roof flashing as recited in  claim 7 , in which said roof flashing is made from a plastic. 
     
     
         9 : The roof flashing as recited in  claim 7 , in which said corrugated portion includes a bottom corrugation that defines a bottom corrugation plane, said bottom corrugation plane establishing a starting angle orientation of said outer sleeve with respect to said planar flange, said starting angle orientation being defined as a planar angle between said bottom corrugation plane and said planar flange, such that said outer sleeve may move through a first range of angles, about said starting angle orientation from a backmost angle to a frontmost angle, as said corrugated portion flexes front to back. 
     
     
         10 : The roof flashing as recited in  claim 9 , in which said roof flashing is made from a plastic. 
     
     
         11 : The roof flashing as recited in  claim 9 , in which said backmost angle is at least +45 degrees with respect to said starting angle orientation, and said frontmost angle is at least −45 degrees with respect to said starting angle orientation. 
     
     
         12 : The roof flashing as recited in  claim 11 , in which said roof flashing is made from a plastic. 
     
     
         13 : The roof flashing as recited in  claim 1 , in which said roof flashing flexes at said corrugated portion with said outer sleeve moving through a second range of angles from 45 to 90 degrees with respect to said planar flange and said outer sleeve may move in a longitudinal direction therealong away from said aperture as said corrugated portion becomes flexingly extended. 
     
     
         14 : The roof flashing as recited in  claim 13 , in which said roof flashing is made from a plastic. 
     
     
         15 : The roof flashing as recited in  claim 13 , in which said planar flange of said base plate includes measurement indicia thereon for measuring the vent pipe to ensure that the top end of the vent pipe is within a minimum and maximum length above the upper surface of the roof. 
     
     
         16 : The roof flashing as recited in  claim 15 , in which said roof flashing is made from a plastic. 
     
     
         17 : The roof flashing as recited in  claim 1 , in which said corrugated portion has a generally frusto-conical shape. 
     
     
         18 : The roof flashing as recited in  claim 17 , in which said roof flashing is made from a plastic.