Linked from
The 18 pages that link to Wood preservation, each with the reason it gives.
WoodRelated: Treatments extend wood's service life by limiting biological and environmental damage.
TimberRelated: Preservatives extend the service life of timber exposed to damaging conditions.
InsecticideRelated: Insecticidal preservatives protect structures and products from insect damage.
SawmillRelated: Preservation can extend the service life of lumber after it leaves the mill.
Arsenic trioxideRelated: Arsenic trioxide has been used to make arsenic-based wood preservatives.