Door Membrane for Water

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Okay, I finished my window regulator and it operates great now. However, when I did a water test just to make sure everything is operating as it should I get a lot of water inside the door cavity. The water gushes in when I spray around the side mirror. I have never had a water leak before so its bound to be something I am missing although I'm not sure what.

My searches have brought me to the door membrane (which I presume to be the black foam type material that is glued down behind the door panel. When I did the regulator I carefully removed it 3/4 around (left the bottom attached). Does this have to be reattached to stop watering from entering the inside of the door panel because I have not reattached it yet? The searches seem to blame this and I could see how it would affect the carpet on the panel but I can't see how this would affect water from actually getting inside in the first place.

I want to make sure I get it done right before I put it all together. That water can't be good because it drips straight down where the speaker will be, on the window regulator motor connector....

I have included a pic my door panel with the black material pulled back is this the membrane?

forgot to attach the pic

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Is it supposed to get some water inside the door cavity to drain out?? It doesn't go inside the car, just inside the door.

[fpb111]

Water will get inside of the door cavity. There are drains along the bottom of the door to let it out. The membrane seals the door cavity so that water will not soak the back of the panel or get inside of the car.