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good one

Kal Row
Kal Row Member Posts: 1,520
in THE MAIN WALL
My customer with a 3 story house had a leak in the led-bend leading to a toilet on the second floor which as leaking onto the ceiling of the floor below, since no one was going to be in the 2nd and 3rd floors for the summer, we removed the toilet and plugged the hole intending to fix the led-bend after the summer. However as the summer progressed, the ground floor occupant complained that it was dripping, but only at late night, and eventually that part of his bath ceiling collapsed.

At first we were stumped, since no one was living in the upper levels how could there be a leak if we had already removed the toilet, and also, why only at late at night??

What was happening was as follows, on the top floor the were two toilets, and late at night when the city pressure always goes up due to less use, the fill valves in the toilets were seeping ever so slightly, causing water to trickle down the main stack. Now, during a normal flush, the water moves at high speed, and goes straight down with no problems, a trickle of water however, will circle and cling to the walls of the stack, and go into any opening along the way, in this case right into the opening where the rotten led-bend was - hence the drip only late at night!!!

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