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9
Stabilizing Sinking or Moving Floors
Dropped Slab
Floor Slabs That Move
Underground is sinking most where
cracks converge. Stop the sinking.
Jackhammer or core drill through to the
ground under the slab. MAKE SURE
THAT THERE ARE NO UTILITIES
UNDER THE WORKING AREA.
Drive connected sections of pipe through
concrete into earth until the pipe will no
longer move. Then drive the cap about
1” below the surface.
Pour
Con-Patch
around and over pipe
and cap. Fill until level with floor.
1
2
3
When
Con-Patch
dries, pipe, floor, and
cracks have been fused together to
make one well-supported floor.
Dropped
Concrete
Slab
Due to earth shifting or sinking, on-
grade floor slab movement may result in
unsafe or unpassable conditions.
Floor movement is either active or firm.
Active floor movement is when a floor
teeters as heavy objects move over it.
Firm floor movement is when a slab
position changes but does not move
when traffic passes over it.
In either case, floor slab movement may
end up with severe cracking, broken and
dropped sections, or slabs not in level
with neighboring slabs.
Here are corrective measures to make
floors safe and ready for coating with
permanent coatings or provisional sealers.
When a floor slab has moved but remains
well in place, follow the floor leveling
procedures outlined on the
Con-Patch
Epoxy Mortar page.
If many cracks converge to a common
spot of the floor, it is most likely that
earth has dropped under where the
cracks converge.
How to Stabilize an At-Risk Concrete
Floor Using Galvanized Pipe