If its on facebook pages, it means Share4Share
S4S means surfaced on all 4 sides.
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It means support for support.
Square all 4 sides.
Smooth 4 sides. All four sides have been planed.
Eased 4 Edges S4S = Surfaced 4 Sides
S4S KD lumber refers to "Surfaced Four Sides" and "Kiln Dried" lumber. This type of wood is planed on all four sides to achieve a smooth finish and is dried in a kiln to reduce moisture content, making it less prone to warping or splitting. S4S KD lumber is commonly used in woodworking and construction for projects where a finished appearance and stability are important. It is often utilized for furniture, cabinetry, and trim work.
Open Safari. Go To The Page On Facebook. And Copy The Web Address & Then Go To Post It. (It Doesn't Give The Blue Link Though) If You Wanna See The S4S's On Your Page, Click All ; Instead Of -Your Page Name Here- (It's Under The Thing That Says 'Share Post')
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It means Share for Share - you share their pictures, they will share yours.
Board feet is the unit measure of rough lumber. Linear feet is the unit measure of S4S lumber. (smooth 4 sides)
In the US, s4s (surfaced 4 sides) is usually about a half inch longer than the measurement, but rough cut is often 2 inches longer than the measurement.