Raising Garage Floor

[AlanAdams]

Hi All, I am remodeling the kitchen and removing a wall to increase the size.
The wall is one that is part of the garage and after removing it I am left with a small 1 inch drop followed by a 18inch step and another 4 inch drop to the garage floor.
I wish to obviously level this all off, but although a pretty good handyman with wood, electrics and bricks have never laid a floor.
Do I just put lots of crushed rocks etc down and pummel it then put a good layer of concrete on top or do I need to put in rebar for structural support.
The area I wish to raise is 13 ft x 6 ft x 4-5 inches. Obviously any help about how to go about completing this project will be greatly appreciated.

 

[larry4406]

Sounds like you are expanding the kitchen into a portion of the garage which is at a lower elevation.

Leave the garage slab alone. Put a pressure treated sill plate on the slab, frame up with short walls and a floor system that is level to the kitchen floor. Take into account any flooring finish thickness ("flooring allowance") when you set your subfloor elevation. Finish your kitchen, restore the 5/8" Type X gypsum board on the garage side (1 hour fire rating).

Loosing 13x6' from the garage is a major loss to the garage.

Welcome to the site with your first post.

 

[Radix2]

Is the present kitchen on a slab?

Either frame a floor or use block to define new perimeter, fill and install new slab. Framing is going to be less expensive.