I have an area in the 1940? section of my home where due to water seepage around a replacement window I have extensive termite damage. I have a 3' plus area where the 6"x8" sill beam has been completely eaten away. The nasty bugs did do eat the floor joists just the sill beam the joists were notched into. The joists are sitting on the brick foundation and the floor is not sagging. I am going to have to replace some wall studs and will frame a new opening and replace the window to get rid of the leak. Wondering if I can use concrete to replace the sill beam and give a solid place for the wall studsto sit?