another ?

first off let me thank you all for helping me on my other questions they were very helpful. here goes another. the same big client i have been working for has another leak over an office. i have tried 3 times to repair it to no success,i will put pictures up soon!the other day i noticed a plumbing pipe almost filled to the rim when it wasnt raining but it only leaks when it rains and that is the same area. i guess what im asking do you think that when it rains its filling that up and going behind the lead? now this is a flat roof but in this situation shouldnt make a difference.please give me your input because thats the only thing else i see to create a leak.

I was going to suuggest blowing on it! :laugh:

I agree with the above assessments. But it reminds me of an old practical joke to play if you are on a new construction job that is getting the pipes tested. You'll know the test is going on when you see the lower vent stacks plugged with inflatable plugs. The highest vent stack will have water at or near filling it. You point out the water to your intended victim. Then, when they aren't looking, you put your mouth over the stack and blow hard. The water will disappear. You say to the victim "where did that water go?" They invariably will walk over and put their face right over the stack for a look. The water will return (8 to 10 seconds after blowing)as a fountain spouting about a foot above the stack dousing the victim. Funniest in cold weather.

i guess what im asking do you think that when it rains its filling that up and going behind the lead?

Yes,test it by draining the water(siphon),and If it is capped off underneath,remove it and patch the roof

If it is a stack pipe and it is filled with water, then the pipe is clogged and it is seeping into the building. Those pipes just allow for air to get into the system so that it doesn't lock and gurgle when it is draining. If water is standing in them, it is a bad sign. Like the guys said, either it is capped off inside or the line is plugged. Either way, you need to find out. Run a snake down the line and see if it hits a solid opject; a clog or a cap. This will also tell you how far into the building it is. Find it, and I predict you will find the source for your leak! Happy hunting!

Reminds me of a very hard to find leak. 4 others didn't find it. No holes in the roof, no holes in the pipe flashing. Somebody had cut the pipe off inside, and set it on the ceiling loist. Looked AOK on the roof! :laugh: :side:

copperman Said: is this a vent pipe or a roof drain? Is it filled with water? If its a roof drain then its clogged and needs to be cleaned out. if its a plumbing vent is it cut off and out of service and capped inside. Perhaps its the leak source.

is this a vent pipe or a roof drain? Is it filled with water? If its a roof drain then it's clogged and needs to be cleaned out. if it's a plumbing vent is it cut off and out of service and capped inside. Perhaps it's the leak source.