Pit underpinning stabilizes structures before adjacent excavation using concrete and mortar.

Pit underderpinning illustration

Common uses

Underpin foundations


A limited-width pit (panel) is excavated and shored by hand below the structure, extending to the design depth. The pit is then filled with concrete, leaving several inches of space under the bottom of the structure. Mortar is then packed into the space to provide the load transfer. Additional adjacent panels can be constructed after the concrete and mortar reach sufficient strength.


Design-build solutions offered