Run a chalk snap line between the marks and snap the line against the slab to lay out the position of one of the wall s sides.
How to add wall to existing room concrete slab.
Step 1 stretch a tape measure across the concrete slab and mark the position of the wall s ends.
If this is the case drill through the curb and into the slab with a roto hammer every few feet.
Add all of the concrete right away so none of the mixture has a chance to dry out.
Exterior wall on slab must be out on the edge an exterior wall must be placed on the outside edge of the slab so the exterior siding laps down and over the edge of the slab.
I currently have a garage built upon an existing concrete slab i believe a plain 4 slab no foundation wall at the edges.
Then design a bathroom layout that will function properly with the existing plumbing plan or with limited modification.
I m considering either a replacing the 2x4 sill with a pressure treated 2x4 sill or.
First ensure the existing wall to which the new one will attach at a 90 degree angle has a stud immediately behind the new wall location.
The framing currently sits on an untreated 2x4 wooden sill plate.
This prevents water from leaking under the bottom of the wall to the inside of the building.
Then fill the holes in the slab with hydraulic cement.
In order to add a bathroom to a house on a concrete slab you will need to locate the existing water supply and waste lines.
Pour concrete onto the existing slab until it is around where you want the final level to be.
Your local building code may call for the wall to be anchored to the slab with threaded rods.
Next check for joists running above the new wall.
Apply the new concrete over the primer.