Hey guys,
Ok so I am remodeling my basement which is technically the first floor of a two story home, I took out the ceiling and noted a cracked joist that runs a 20 foot span under my kitchen and dinning room, there is no center suppo rt and it is supported at the ends on top of cinder block and set in concre te. The crack is 8 feet from the wall in my laundry room which is under my kitchen and extends approx. 3in from the bottom edge into the beam across a 1 foot span. The beam is a 2x12x20. To repair this I want to sister it and build a frame to support it in the middle which I can accomplish by adding a door way to the laundry room. I want to put king beams on either side ap prox. 48in apart and have a 3 foot opening into my laundry room. I was goin g to use 2 stacked 2x4s to make the header. My question, Is this adequate s upport? What can I do to make this better? I just want to make sure I do th is right, Thanks for your help.