How do I build a hearth so my house doesn't burn down?

I'll be heating with this http://www.usstove.com/index.php?route=product/product&path=170&product_id=958 stove for a winter or two, before I build a RMH. What's the best way to keep the wood floors from burning? I've got the distance from the combustible wall solved.

Sounds like you need a hearth pad:
http://www.woodstove.com/pages/guidepdfs/Plan%20your%20hearth.pdf (Page 4)

Perfect! Thanks!

I thought I needed an airspace in the hearth, like against the combustible wall, but if they say the "open faced sandwich" of plywood, cement board, mortar, and tile is sufficient, then I believe that.

Very nice! One thing puzzles me though. If backer board and tiles are sufficient protection for the framing of the raised hearth, why not just remove the floorboards in the area and replace with backer board and tiles?