Hi Group. We have a friend who would like to add a room/floor above an existing kitchen. It currently has a flat roof , which is eventually needs to be changed so they thought why not put a room up there. It is roughly 16 by 22' . Framed 2X4 with slab on grade. The project certainly looks possible but he said someone told him he may have to upgrade the beams of the slab? The drawings show a typical slab/rebar etc with the beams at 2ft deep and 12" thick. They put houses all around him up two and even three floors on the same slab, why would the existing not be enough to take the added weight of a few walls and the roof?
Any help appreciated, they just want an idea before they see the dredded "e:" word (engineer)
G