S4S means surfaced on all 4 sides.
Eased 4 Edges S4S = Surfaced 4 Sides
Square all 4 sides.
Smooth 4 sides. All four sides have been planed.
Board feet is the unit measure of rough lumber. Linear feet is the unit measure of S4S lumber. (smooth 4 sides)
it is a superior wood for decking, staying smooth and splinter free for years. Also, it looks much better than treated pine.
Plastic lumber may be used for building outdoor decking areas or other recreational structures. It may also be used for molding, trim work or as a general replacement for many wood applications.
Trex,found at local lumber supply
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If its on facebook pages, it means Share4Share
It means Share for Share - you share their pictures, they will share yours.
To set untreated timber in cement is asking trouble. Only pressure treated lumber should be used as a foundation support for outdoor decking. Greenwood can also lose its original shape.
It means support for support.