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Ginge, the door has a cill at the bottom which directs the rain out over the threshold. Over time, with summer sun, this cill is two centimetres higher on one side than the other. This is where the water's coming in. It comes into the channel at the bottom of the door frame and eventually spills over onto the floor. You can see that the door has warped to the left hand side. Sometimes, in the summer, we have trouble closing it.