I am about to replace the rotten bottom sill of my old home that was built in 1870. This house has true rough cut oak 2x4 boards. The width of my front house that needs replcaed is 12 ft. If I can not lift the house up, can I just build in two section a 2x4 treated 6ft long to two 2x6 treated boards standing on its side, then using a 2x4 on top of that. Do this 2 times?