CHAPTER 9
WOOD, LUMBER, AND OTHER BUILDING MATERIALS
Wood and lumber are not interchangeable terms, although there is a direct relationship between the two of them. Wood refers to the species of tree that lumber comes from. Lumber is a product that is manufactured from wood. Lumber has a uniform size and fits into certain categories, so theoretically all 2x4s that are ten feet long are exactly the same size. All lumber is made of wood, but not all wood is made into lumber.
Hardwoods and softwoods are the two divisions of types of trees and the wood that comes from them. You would naturally assume that the wood from a hardwood is higher in density than that from a softwood, and for the most part this is true, although the two divisions are really ...
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