Solid Hardwood, Engineered and Laminate Flooring - To level or not to level, that is the Q

I have an older home built in the early 1900's and it has had many modifications to its flooring over the years. Im changing the vinyl flooring in my kitchen but have been noticing a trend with the leveling of the tongue and groove subfloor. It seem the floor drops toward the center walls of the home of the entire first floor. So I have flat floors except for a 1/4" to 3/4" inch drop within 1ft to 3 ft from the center walls. Im thinking I need to add some more support in the basement to the joists that support these walls. However, I see that only preventing more damage in the future and not doing much for my present floor project. I've tried self leveling compound in one room, but dont know if I should continue this method for my kitchen as well. Any advice welcome. Thanks.

You need to be careful with your old house and adding structural weight!!!

Your house is sinking or the structure can't support to weight that is already there.

I'd be scared to add any more weight until some strength was built into the structure.:eek:

Thanks. As far as more strength, do you think adding some posts to the basement to help support the joists would help?

It wouldn't hurt!

Beams may be needed in the center of joist spans also, or sistering existing joists. A sag in wood structures means the damage has been done. You want a crown to all wood structures for strength purposes.