I have a 50 year old house the majority of which is pier and beam he rest 4 inch slab. I want to add to the house residing on the slab. My plan is to drill horizontally 12 inches into the old slab insert rebar and pour my slab extension. The house is single story brick veneer. Does this sound like a sound approach? Any suggestions. The new slab will add 150 sq ft to the existing slab.
Thank You
Replies
if you're talking about just a slab, it sounds fine. If you're talking about building living space on the new slab, you need proper footings, etc.
Bob
Drilling into the side of a 4-inch slab will give you less than 2-inches of concrete for any vertical shear at the dowels, which is basically nothing. Is the 4-inch slab thickened at the edge? Otherwise, as the previous posters have implied, a 4-inch slab is not a foundation. Local codes around here require 12-inch thick and minimum 12-inch wide strips for wall foundations, or post piers.
My house had an addition built on a cracking, crumbling 4-inch slab. It was obviously an exterior slab that someone just slapped a room on top of. I've since demolished it and rebuilt the space with a proper foundation.