An oversite is a layer of concrete, typically poured over a damp-proof membrane and hardcore, that seals the ground under a building's ground floor. It prevents moisture, ground gases, and plant growth from rising into the crawl space or floor void.
Heard on the job
The inspector wants to see the membrane before we pour the oversite concrete.
Also heard as
- oversite concrete
Related terms
Crawl space
A low-clearance area beneath the ground floor of a building used for utility access.
Damp course
An impermeable layer built into a masonry wall near the ground to prevent moisture from rising through capillary action.
Subfloor
The structural layer resting on the floor joists that supports the finished flooring.