On Tuesday, 11 November 2014 11:23:39 UTC, Cursitor Doom wrote:
This wood they sell as treated (got a sort of greenish tint to the
outside of it; slightly pinkish inside) - is it sort of like thoroughly
soaked in the preservative chemicals so it penetrates right the way
through or is it essentially just a superficial coating of just a few mms?


It's pressure treated so the outer ~5mm are pretty rot-proof (and the remainder
is protected because the outer 5mm prevents any oxygen getting in).

However if you cut the outside away, the remainder can be vulnerable, so you
should soak it well in preservative.