The
in most yurt sites has one using 4x4's spaced 4' apart. I can't remember the type of wood at the moment but it is not native to this area. East coast.
Then putting advantec on top, 2-4" of insulation underneath
Since then I have seen two structural designs I think work better which is using 2x10 every two feet( especially for full time living and interior walls) on top of ( now this depends on size of yurt) three 2x10'--- so laying three beams the length of ones yurt, space evenly apart, the on top of that every two feet (creating a T) putting 2x10 footers across them.
On top of that Laying 2x6 t&g leaving out the advantec. This is the more expensive choice
The other is to take the 2x10's (at desired length) to create a pie shape. Then laying the 2x6 t&g on top. Insulation underneath. Without insulation I know of a guy who will do the pie shape for 3k without insulation.
I have heard of creating a cement foundation with radiant heat but cement is expensive, not great to walk on --at that rate I would go with an earthen floor which are beautiful --- not a dirt floor like you might imagine.