If you have a contract with this guy, you shouldn't have to give him any more money! And especially so much more! And if you do give him more, hold it back until the job is completed. The reason you have a contract is so that builders (siders, etc) can't get away with this crap. My brother was a contractor and put an addition on my home for our mother, who was paying for it. He would ask her for money, but fortunately, I had her checkbook and refused to give him anymore until the job was done. Caused some hard feelings, but I knew if he had all the money, I would never see him again! At least as far as the job was concerned.