Here is my problem. I have a house that is balloon framed. The studs sit on what I'll call two sill plates. One on top of the foundation and another on top of that one. There is about a six foot section that shows old termite damage. I am in a position that I must make repair to the damaged area and it has been recommended that sistering a piece of 2x6 in the area is a inexpensive and effective way to perform the repair other than lifting the house and replacing the entire sillplate which I am told could be expensive. So now for my question. What is sistering, how would the proceedure be performed and is it effective?