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Flat Roof Leak

2988 Views 3 Replies 2 Participants Last post by  Ed the Roofer
I just discovered a relatively small leak in my asphalt roll flat roof. From what I can ascertain, it seems like there must be a break in the flashing around the house's main stack (3" cast iron), allowing a small amount of water to trickle in and run straight down the stack and into the attic. If necessary I can make my way up onto the roof tomorrow and take some photos (it's currently raining), but from previous visits to the roof I know that the flashing is not one of those preformed rubber or metal ones, rather, it looks as though some pliable metal (perhaps lead) was used and then coated with roofing cement.

So, how do I go about fixing this? The roof is in otherwise great shape.

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Ed- I hope you don't mind if I ask some follow-on questions. Specifically, I just want to confirm that the procedures you described in the past are appropriate given that this leak involves the flashing around the base of a vent pipe. Currently the shroud or flashing is a flexible material of some sort (hard to tell as it it coated in roofing cement). So, will this work?

There is no pipe boot, would it make sense to try and install one at this point? Is that even possible?

Also, it sounds like the choice of cement is dependent on the roofing material. How can I be certain what I have? It is obviously a roll roofing materially and looks like long and wide sheets of asphalt shingles. It is relatively light in color.

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