Lumber

A hard board made from wood processed at a sawmill. It is even harder to find where it's not used.
Overview
Lumber is one of the earliest processed goods that can be produced in the game, and it is also one of the most widely used construction materials. It serves as a basic building resource for many early projects, making it an essential item for expanding a settlement.
Although Lumber is highly important, its production efficiency is rather poor. To mass-produce it, players usually need to build multiple 
Official description
A hard board made from wood processed at a sawmill. It is even harder to find where it's not used.