Foundation (engineering)
Foundations are designed to have an adequate load capacity depending on the type of subsoil/rock supporting the foundation by a geotechnical engineer, and the footing itself may be designed structurally by a structural engineer. The primary design concerns are settlement and bearing capacity. When considering settlement, total settlement and differential settlement is normally considered. Differential settlement is when one part of a foundation settles more than another part. This can cause problems to the structure which the foundation is supporting. Expansive clay soils can also cause problems.
House in the Woods
The cards on the tableau are built either up or down by suit; the player can have the cards go both directions at the same pile. However, an ace cannot be placed on a king and vice versa; an ace should be transferred to the foundations. Furthermore, when a pile becomes empty, it cannot be filled. All eight foundations are built up in suit starting from aces.