We purchased a home from the 20's or 30's. It's two story plus a full attic, and a finished basment with a sub-basement with about 4' of height in most areas.
The floors are sagging toward the middle of the house from front to back, on the back half of the house.
Does anyone know how I can determine if the beams in the sub-basment are sagging? There are screw type ajustable posts that are planted in 5 gallon buckets of concrete buired in the dirt (former owner did this).
I remember seeing on This Old House where Tom Silva showed how to tie a string from one end of the room to the other and with a sting level you could figure out where to jack the beam. The problem is, I don't remember the specifics of how to do this. Does anyone know what I'm talking about?