Just a thought to share with you, when he has left a puddle for you do you point and tell him he is bad, or do you clean it without saing anything to him?
its not the case with all dogs but if in the past when he wee's if you have gone in and pointed to it and told him what a bad dog he is well although that is more then understandable he may be thinkng 'well hold on a minute, if I do a wee here now then my mom should come in to tell me off so then at least i get some attention!' I tell you now it takes a clever dog to be naughty!!! if in the past you have told him off try just going in and not saying or even looking at him, just clean it up and blank him for least ten minutes after, whenever you come into the room in the morning and he is clean make big fuss.