The bottom-most or first course in masonry.
A layer of asphalt below the wearing course.
A material of a designed thickness placed under the surface wearing course of paving units and bedding course. It is placed over a sub-base or a subgrade to support the surface course and bedding. A base course can be compacted aggregate, cement or asphalt stabilized aggregate, asphalt or concrete.
Continuous horizontal course that sets on the brick ledge. It is the first course set in a wall.
The first or bottom course of masonry blocks or logs in a wall. (sill logs).
The lowest course of masonry of a wall or pier
"Base course" refers to the sub-base layer of an asphalt roadway. Generally consisting of larger grade construction aggregate, spread and compacted to provide a stable base for further layers of aggregates or asphalt pavement.
