We recently had water leaking from the ceiling of the first floor in our house. It turned out the water was coming from a shower on the second floor. The water was leaking through a space between tiles on the wall, about 3′ above the floor. There is a window located directly above the tile where the leak occurred. There appears to be little or no grout between the tiles at the location of the leak. Our landlord is telling that the grout has deteriorated from a lack of cleaning and that as a result, we are at fault and must pay for the damage. The house is a little over a year old. Can not cleaning a bathroom cause this? Is there any credibility to him saying this?