Smooth 4 sides. All four sides have been planed.
S4S means surfaced on all 4 sides.
Square all 4 sides.
Eased 4 Edges S4S = Surfaced 4 Sides
Board feet is the unit measure of rough lumber. Linear feet is the unit measure of S4S lumber. (smooth 4 sides)
g
If its on facebook pages, it means Share4Share
No, the noun lumber is not used as a collective noun. The collective noun for lumber is a stack of lumber.
It means support for support.
Lumber is used for building things like houses, barns, sheds, and many other things.
Dimensional lumber does not have to be used for outdoor projects. If a rustic look is what you want then non dimensional lumber, even with the bark on, can be a desired effect.
Lumber is singular. Plural would be lumbers. Lumber is used to describe wood. Lumbers is used to describe the action of being lazy and slow.
Lumber is just wood that is used for building materials. So houses and buildings would be the primary use.