One-piece molded corner flashing for dormers, roof offsets and chimneys

Abstract

A one-piece molded plastic flashing precisely fits outside corners of chimneys, dormers and roof offsets on pitched roofs ranging from 3/12 to 12/12 consisting of a horizontal roof plane, and a pair of vertical planes, angled with respect to one another to match with the pitch of the roof.

1 . A corner flashing for roof constructions comprising: 
 a horizontal plane along a downwardly pitched roof of a first angle ( 42 );    a pair of vertical planes intersecting one another at a second angle ( 43 ) and with leading and trailing edges of individual vertical planes intersecting with said horizontal plane at third and fourth angles ( 40 ) and ( 41 ), respectively;    wherein said angles are selected in accordance with the formulae:      angles ( 40 )+( 42 )=angle ( 43 );  angles ( 42 )+( 43 )=angle ( 41 );  and  angle ( 43 )=90°;  and    wherein said horizontal and vertical planes are composed as a one-piece molded fabrication.    
   
   
       2 . The corner flashing of  claim 1  wherein each of said horizontal and vertical planes are at least 5 in.×7 in. in size.  
   
   
       3 . The corner flashing of  claim 2  wherein each of said planes are of thickness between 1/16 in. and ⅛ in.  
   
   
       4 . The corner flashing of  claim 3  wherein said horizontal plane is of dimension 12 in.×12 in.  
   
   
       5 . The corner flashing of  claim 4  wherein each of said vertical planes are of dimension 7 in. wide and 6 in. high.  
   
   
       6 . The corner flashing of  claim 5  wherein said horizontal and vertical planes are of plastic fabrication.  
   
   
       7 . The corner flashing of  claim 6  wherein said horizontal and vertical planes are of 1/16 in. thickness.  
   
   
       8 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 5:12 pitch roof, angles ( 40 ) and ( 41 ) are 67° and 113° respectively.  
   
   
       9 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 6:12 pitch roof, angles ( 40 ) and ( 41 ) are 63° and 117° respectively.  
   
   
       10 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 7:12 pitch roof, angles ( 40 ) and ( 41 ) are 60° and 120° respectively.  
   
   
       11 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 8:12 pitch roof, angles ( 40 ) and ( 41 ) are 56° and 124° respectively.  
   
   
       12 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 9:12 pitch roof, angles ( 40 ) and ( 41 ) are 53° and 127° respectively.  
   
   
       13 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 10:12 pitch roof, angles ( 40 ) and ( 41 ) are 50° and 130° respectively.  
   
   
       14 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 11:12 pitch roof, angles ( 40 ) and ( 41 ) are 47° and 133° respectively.  
   
   
       15 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 12:12 pitch roof, angles ( 40 ) and ( 41 ) are 45° and 135° respectively.  
   
   
       16 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 4:12 pitch roof, angles ( 40 ) and ( 41 ) are 72° and 108° respectively.  
   
   
       17 . The corner flashing of  claim 1  wherein for a first angle ( 42 ) of a 3:12 pitch roof, angles ( 40 ) and ( 41 ) are 76° and 104° respectively.