Curb for use with roof flashing

Abstract

A roof curb is used in association with a roof flashing installed on a roof with an incline and corrugated ribs, the roof flashing having a base member that may be mounted over a substantially vertical chimney in the roof and a hollow member having a first end and a second end, the first end being larger than the second end and the first end being attached to the base member of the roof flashing. The roof curb includes a first skid and a second skid that may be mounted upon the roof substantially in a direction of the incline and substantially parallel to each other. The first skid and the second skid each have a length that terminates in a top end and a bottom end, each of the first skid and the second skid being tapered such that the bottom end of each of the first and the second skids has a height greater than the top end, the first and the second skids being selectively attached to the roof to bridge the corrugated ribs and the taper being of a gradation to permit attachment of the roof flashing to the roof curb and passage of the substantially vertical chimney therethrough, the roof curb being discrete from the roof flashing.

1 . A roof curb used in association with a roof flashing installed on a roof with an incline and corrugated ribs, the roof flashing having a base member adapted to be mounted over a substantially vertical chimney in the roof and a hollow member having a first end and a second end, the first end being larger than the second end and the first end being attached to the base member of the roof flashing, the roof curb comprising:
 a first skid and a second skid that are configured to be mounted upon the roof substantially in a direction of the incline and substantially parallel to each other, the first skid and the second skid each having a length that terminates in a top end and a bottom end, each of the first skid and the second skid being tapered such that the bottom end of each of the first and the second skids has a height greater than the top end, the first and the second skids being selectively attached to the roof to bridge the corrugated ribs and the taper being of a gradation to permit attachment of the roof flashing to the roof curb and passage of the substantially vertical chimney therethrough, the roof curb being discrete from the roof flashing.   
     
     
         2 . The roof curb of  claim 1 , comprising a cross-beam member between the first skid and the second skid. 
     
     
         3 . The roof curb of  claim 2 , wherein the cross-beam member, the first skid, and the second skid are formed of a unitary piece. 
     
     
         4 . The roof curb of  claim 3 , wherein the length of the first skid, the length of the second skid, and the cross-beam member are joined in a U-shaped configuration. 
     
     
         5 . The roof curb of  claim 2 , wherein the cross-beam member has notches such that the corrugated ribs of the roof fit within the notches and the cross-beam member abuts flush against the roof. 
     
     
         6 . A roof flashing assembly for attachment to an inclined roof having corrugated ribs, comprising:
 a roof flashing having a base member adapted to be mounted over a substantially vertical chimney in the inclined roof and a hollow member, the roof flashing having a first end and a second end, the first end being larger than the second end and the first end being attached to the base member of the roof flashing; and   a roof curb having a first skid and a second skid that are each configured to be mounted upon the inclined roof substantially in a direction of incline and substantially parallel to each other, the first skid and the second skid each having a length that terminates in a top end and a bottom end, each of the skids being tapered such that the bottom end of each of the skids has a height greater than the top end, the skids being selectively attached to the inclined roof to bridge the corrugated ribs and the taper being of a gradation to permit the attachment of the roof flashing to the roof curb and passage of the substantially vertical chimney therethrough, the roof curb being discrete from the roof flashing.   
     
     
         7 . The roof flashing assembly of  claim 6 , comprising a cross-beam member between the first skid and the second skid. 
     
     
         8 . The roof flashing assembly of  claim 7 , wherein the cross-beam member, the first skid, and the second skid are formed of a unitary piece. 
     
     
         9 . The roof flashing assembly of  claim 7 , wherein the length of the first skid, the length of the second skid, and the cross-beam member are joined in a U-shaped configuration. 
     
     
         10 . The roof flashing assembly of  claim 7 , wherein the cross-beam member has notches such that the corrugated ribs of the inclined roof fit within the notches and the cross-beam member abuts flush against the inclined roof. 
     
     
         11 . A method for installing a roof flashing on a roof with an incline and ribs, the roof flashing having a base member adapted to be mounted over a substantially vertical chimney in the roof and a hollow member having a first end and a second end, the first end being larger than the second end and the first end being attached to the base member of the roof flashing, the method comprising the steps of:
 attaching a first skid and a second skid upon the roof substantially in a direction of the incline and substantially parallel to each other,   cutting a slot in the roof above the substantially vertical chimney, the slot sized to receive a top edge of the base member;   inserting the top edge of the base member into the slot cut in the roof; and   attaching the base member of the roof flashing to the first skid and the second skid.   
     
     
         12 . The method of  claim 11 , comprising the step of applying sealant at the slot that has been cut in the roof. 
     
     
         13 . The method of  claim 11 , comprising the step of applying sealant at locations where the first and second skids have been attached to the roof. 
     
     
         14 . The method of  claim 11 , comprising the step of applying sealant at locations where the roof flashing is attached to the first skid and the second skid. 
     
     
         15 . The method of  claim 11 , wherein the first and second skids are attached by screws. 
     
     
         16 . The method of  claim 11 , wherein the roof flashing is attached to the first and second skids by screws. 
     
     
         17 . A roof curb, comprising:
 a generally U-shaped ledge configured to engage a flashing;   a base wall extending in a first direction from a base portion of the generally U-shaped ledge;   a first side wall extending in the first direction from a first arm portion of the generally U-shaped ledge; and   a second side wall extending in the first direction from a second arm portion of the generally U-shaped ledge, wherein the first side wall and the second side wall taper in height along a second direction transverse to the first direction and extending from the base portion of the generally U-shaped ledge toward distal ends of the first and second arm portions of the generally U-shaped ledge.   
     
     
         18 . The roof curb of  claim 17 , wherein the generally U-shaped ledge is formed by engagement of generally L-shaped ledges of respective roof curb components. 
     
     
         19 . The roof curb of  claim 17 , wherein the base wall has notches such that corrugated ribs of a roof fit within the notches and the base wall abuts flush against the roof. 
     
     
         20 . The roof curb of  claim 17 , wherein the base wall, the first side wall, and the second side wall are formed of a unitary piece.