This document discusses foundations in permafrost soil. It begins by defining permafrost and where it can be found. It then discusses different types of permafrost, including thaw-stable and thaw-unstable types. The document outlines various foundation designs for buildings in permafrost regions, including slurry pile foundations, driven piles, and natural convection pile foundations. It also discusses surface foundations using post and pad designs. The document emphasizes maintaining air flow beneath elevated foundations to protect the permafrost.