[0] Naturally treated reused wood [1] Low [2] Low. See note. [3] Medium to high [5] Use nontoxic sealant on untreated wood (Flaxseed oil or wax) [4] 
Moderate
C o s t
F r e e t o l o w
L o w w h e n r e u s e d
M o d e r a t e
L o w t o h i g h
H i g h