If your foundation or basement is only being supported at one end, an expert will say it’s cantileveredIf your foundation or basement is only being supported at one end, an expert will say it’s cantilevered. Some engineers cantilever a foundation on purpose, for special load-bearing circumstances, while others become cantilevered over time as the building materials degrade. More. Some engineers cantilever a foundation on purpose, for special load-bearing circumstances, while others become cantileveredIf your foundation or basement is only being supported at one end, an expert will say it’s cantilevered. Some engineers cantilever a foundation on purpose, for special load-bearing circumstances, while others become cantilevered over time as the building materials degrade. More over time as the building materials degrade.