I was taking down the sheet rock and the outside singles on my two story 1960 cape with a basement when to my amazement the house is made of cinder block up to the second floor where it is then made of 2x4 construction, most like a dormer. The place where we want the opening already has a window. The header attaches to the second floor plate and on the bottom the header is attached to the cinder block. The doors are 80 inches high by 6 feet wide. Any information on the size of header needed and any safe tips on taking down the cinder block without the top floor colapsing would be greatly appreciated.

Henry Shirley NY