Key
Definition and meaning of Key in real estate.
Key refers to a slot or groove cast into the top of a concrete footing designed to interlock with the poured concrete wall that sits above it.
In more detail
During foundation construction, the footing is poured and allowed to partially cure. Before the concrete hardens completely, workers create a keyway, which is a continuous channel running along the center of the footing. When the foundation walls are poured on top of the footing, the wet concrete flows into this groove, creating a tongue-and-groove joint when cured.
This mechanical connection is crucial for maintaining the structural integrity of basements, where external dirt pressure pushes against the foundation walls.
Key facts
| Category | Property Types & Construction |
|---|---|
| Key function | Prevents lateral shifting of foundation walls |
| Applies to | Concrete footings and poured foundation walls |
| Common materials | Formed in poured concrete, sometimes reinforced with steel rebar |
A foundation contractor pours a concrete footing for a new home and presses a beveled wooden board into the wet surface to form a key. Once the footing cures, the board is removed, leaving a channel that will lock the basement wall in place.
Frequently asked questions
Why is a keyway important in foundation construction?
A keyway is important because it prevents soil pressure from sliding the bottom of a foundation wall inward off its footing, which would cause catastrophic structural failure.
Does a keyway prevent water leaks in a basement?
No, a keyway provides structural support but is not a waterproof seal. Contractors must apply waterproofing membranes and drainage systems to prevent water from entering the joint.