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Patio leak to room below #2

We have a double story brick and block house. There is a leak from our patio off the lounge, down to the room below. The patio has a textured waterproofing material on it and forms part of the roof of the downstairs room. We suspect water is getting through where the patio joins the window/sliding door off our lounge. Water sits on the patio and is driven against the house in high winds, although we notice the leak every time we have rain now, so suspect it has got worse.