rain water leaks in from 8" circular range vent in ceiling

Hi:

I have a circular 8 inch diameter range (stove) vent that exhausts thru the ceiling in the kitchen. When it rains water leaks in from 2 places on the outter edges of the vent at the ceiling. I have a torch down roof. What do you think the problem is. Is it improperly flashed? Can just a section of a torch down roof be ripped up, a repair made, and just this section torched down? I would like to know my options here. Thanks.

 

Often this problem of water in kitchen vent pipe when it rains is due to the need for a vent cap to keep rain out. There are universal vent caps available.

Have you inspected the flashing around the vent pipe? Leaks on torch down flat roofs are common, as are repairs to flashings and drains. Metal has longer exposure to water on flat roofs and greater opportunities for expedited deterioration, especially if galvanized metal was used. Repairs can be made to flashing and drains. Copper is recommended.

You should be able to peel back roofing and replace flashing and then seal roofing back down. Torch down roofing is a single rubber membrane that is heated with a torch, then bonded to a fiberglass mat that is attached to the roof sheathing. If in doubt, contact a professional for repair.

 

With a flat roof . When they put the new roof on did they rebuild the fan box on the roof for the jack to go on. Any of the fan jacks that we use go over a box on the flat roof. With the roof covering going up and over the box edge. Then the vent jack will come down over the outside of the box and work as the counter flashing over the torch down roof