Flood on the attic

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Found the problem, originally uploaded by Itkovian.
When we arrived home yesterday, it was pouring cats and dogs. I ran inside, fearing the cellar might have been flooded, but everything was ok there. I slowly made my way upstairs, to fetch a dry t-shirt. Passing the bathroom, I noticed a puddle of water in the middle of the floor, unconnected to any wall. Fear gripped me, as I remembered the water that once poured through the ceiling into the office space, wrecking the laminate on the floor. I figured the roof was leaking again.
Checking upstairs, I saw a large puddle, growing rapidly. I never raced that fast down the stairs to fetch some buckets and some towels. I yelled to Veerle and her dad to come up and help, getting a very fast response. After we managed to stop the puddle from growing larger and reaching the vent shaft of the bathroom ventilator, we looked for the problem in between two periods of heavy rainfall. Clearly, the plumber who put in the drainpipe from the roofs frontside to the back, made a slight error. Not only was the output hole of the pipe partially covered, the plate attached to said output hole was much too small to withstand any backfiring water, causing the pressure to spout the water back into the attic.

We managed to fix it by leveraging the stone covering the hole, and by climbing onto the neighbouring roof once the thunderstorm had passed on. Sadly, the water had made it through a crack in the floor to the bathroom (hence the puddle I noticed), filling up the space on top of our new shiny gyroc ceiling. Luckily, we used green gyproc, which is supposed to be able to withstand a lot of humidity.

We'll see what the insurance guy says when he comes by. In any case, we need this fixed soon. So far, we didn't notice any permamanent damage, but this might change as the ceiling dries out. Luckily the new bathroom furniture was not affected.