Building a better basement

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Where adjoining construction or buildings do not encroach on the footprint of the building, the basement may be constructed above ground, and the walls buried with backfilled material or in an excavation.


Excavated basements are built differently than the above-grade components of buildings. Generally, they can be constructed by one of two methods:

Bottom-up construction
The most common form of construction, the bottom-up method consists of first whatsapp number database excavating the earth that will be enclosed by the foundation wall. Then, a soil retention system is installed and the concrete or masonry foundation walls are cast and braced against the soil pressure. The mat slab or pressure slab is then cast on grade at the bottom of the basement, followed by the foundation walls and interior columns.

Top-down construction
Few people would suggest building the roof first and then working down, yet, for some basements, this is an approved sequence of construction. In this method, the enclosing foundation walls are installed first, followed by the ground floor slab that is cast on the finished grade between them. The soil below the slab is then excavated and the subsequent lower basement floors are cast sequentially, finishing with the pressure slab at the bottom of the basement. Columns are inserted into drilled holes.