Floor boards

Added on the February 7th, 2007 update.

Creation

21xPlank
2xLarge Nails

Activate a Plank, right click on Large Nails and click Create->Miscellaneous->Floor Boards.
Activate a Plank, right click on Floor boards and click Continue. Repeat 21 times.
Activate a Large Nails, right click on Floor boards, and click Continue.

Then, activate the Floor Boards, right click a Packed Dirt tile, and select pave.