WE have an old house built in the early 1900's. The enclosed front porch is sagging and when we opened up the unheated crawl space, it looks like the porch is just built on wood 2x4's set right on the ground. Is this possible??

I'm wondering if there is an old footing that has sunk down, that we can't locate. The rest of the house has a concrete foundation that is in good condition. The porch is part of the original structure and has windows with storms and a hardwood floor.

It is just hard to believe that they would build it like this. Does anyone know if this was common practice?