Roof vent assembly

Abstract

A roof vent includes a sub-base, flashing, a vent head, and fasteners. The sub-base includes a sub-base collar extending upward from a sub-base flange. The flashing overlies the sub-base. The vent head includes a ventilation device and defines a vent head attachment portion externally overlapping and capping an uppermost region of the flashing. The fasteners attach the vent head to the sub-base with the flashing sandwiched therebetween. Configured in this manner, the roof vent provides superior resistance to water penetration when compared to other designs.

What is claimed is: 
     
         1 . An apparatus comprising:
 a sub-base comprising a sub-base collar extending upward from a sub-base flange;   flashing overlying the sub-base;   a vent head comprising a ventilation device and defining a vent head attachment portion externally overlapping and capping an uppermost flashing region of the flashing; and   a plurality of fasteners attaching the vent head to the sub-base with the flashing sandwiched therebetween.   
     
     
         2 . The apparatus of  claim 1 , wherein the apparatus comprises a roof vent. 
     
     
         3 . The apparatus of  claim 1 , wherein:
 the sub-base flange is substantially flat; and   the sub-base collar is cylindrical.   
     
     
         4 . The apparatus of  claim 3 , wherein the flashing comprises:
 a lower flashing portion that is flat and overlies the sub-base flange; and   an upper flashing portion that is cylindrical and overlies the sub-base collar.   
     
     
         5 . The apparatus of  claim 4 , wherein the lower flashing portion has an area greater than an area of the sub-base flange. 
     
     
         6 . The apparatus of  claim 1 , wherein the flashing comprises a material selected from a group consisting of thermoplastic polyolefin, polyvinyl chloride, ethylene propylene diene monomer, and modified bitumen. 
     
     
         7 . The apparatus of  claim 1 , wherein the vent head defines a plurality of fastener holes for the plurality of fasteners. 
     
     
         8 . The apparatus of  claim 1 , further comprising a roof topped with a roof membrane, wherein the flashing is joined and sealed to the roof membrane. 
     
     
         9 . The apparatus of  claim 8 , wherein the flashing is heat welded to the roof membrane. 
     
     
         10 . The apparatus of  claim 1 , wherein the plurality of fasteners comprise sheet metal screws. 
     
     
         11 . An apparatus comprising:
 a sub-base comprising a sub-base collar extending upward from a sub-base flange;   flashing overlying the sub-base;   an adapter ring defining an upper adapter ring portion and a lower adapter ring portion, the lower adapter ring portion externally overlapping and capping an uppermost flashing region of the flashing; and   a vent head comprising a ventilation device and defining a vent head attachment portion externally overlapping and capping the upper adapter ring portion.   
     
     
         12 . The apparatus of  claim 11 , wherein:
 the sub-base flange is substantially flat; and   the sub-base collar is cylindrical.   
     
     
         13 . The apparatus of  claim 12 , wherein the flashing comprises:
 a lower flashing portion that is flat and overlies the sub-base flange; and   an upper flashing portion that is cylindrical and overlies the sub-base collar.   
     
     
         14 . The apparatus of  claim 13 , wherein the lower flashing portion has an area greater than an area of the sub-base flange. 
     
     
         15 . The apparatus of  claim 11 , wherein the flashing comprises a material selected from a group consisting of thermoplastic polyolefin, polyvinyl chloride, ethylene propylene diene monomer, and modified bitumen. 
     
     
         16 . The apparatus of  claim 11 , further comprising a plurality of fasteners, wherein the vent head defines a plurality of fastener holes for the plurality of fasteners. 
     
     
         17 . The apparatus of  claim 16 , wherein the plurality of fasteners comprise sheet metal screws. 
     
     
         18 . The apparatus of  claim 11 , further comprising a roof topped with a roof membrane, wherein the flashing is joined and sealed to the roof membrane. 
     
     
         19 . The apparatus of  claim 18 , wherein the flashing is heat welded to the roof membrane. 
     
     
         20 . The apparatus of  claim 18 , wherein the flashing is adhered to the roof membrane.