Foundations
2:26 1. evenly distribute downward force over a large enough area to reduce the bearing pressure and avoid shear failure or excessive settlement.
2. Prevent lifting or sliding along the ground
3. Resist the effects of long-term degradation and decay from insects, rot, etc
4. Must reach a deep enough layer that can't freeze or avoid fluctuations in moisture content to avoid problems that come with water in the subgrade
5. Combat erosion
6. Are cost effective
6:35 Types:
Post and beam with unconnected points of contact with the earth leave room for differential movement
Ribbon foundation
Raft or slab foundation
Basement
Pile foundation
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