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Glam Journal

What does it mean when wood is 4 4?

Author

Matthew Shields

Updated on April 07, 2026

What does it mean when wood is 4 4?

A “quarter” system is commonly used in the hardwood lumber industry when referring to thickness. 4/4 refers to a 1 inch thick board, 6/4 is 1-1/2 inch, 8/4 is 2 inches, and so on.

What is 2s lumber?

S2S= surfaced two sides, S3S = surfaced three sides and s4s = surfaced four sides. S2S – The board has been run through a planer producing two flat faces, but the edges are left rough. S3S – The board has been surfaced S2S first, then one edge is ripped straight (also known as SLR1E or straight line ripped one edge).

Why do they call it 5 4 lumber?

Five quarters, six quarters, eight quarters. It refers to the thickness of the wood, in quarters of inches. So 5/4 is 1 1/4″ thick, 6/4 is 1 1/2″ thick, and 8/4 is 2″ thick.

What surfaced 4 sides?

S4S, or lumber surfaced four sides, is another common surfacing option. This refers to boards being planed and in addition also being straight line ripped on two sides resulting in the board being flat, uniformed in thickness and squared up with parallel edges ready for the manufacturing process.

What is a BF of wood?

A board foot is a wood measurement for a piece of lumber 12″ wide by 1′ long by 1″ thick for estimating purposes. Board foot, or board feet, is commonly abbreviated as FBM, BDFT, or BF.

What is the actual thickness of 5/4 lumber?

Hardwood Lumber Dimensions

Nominal SizeRough SizeActual Size: Surfaced 2 Sides
3/4 inch9/16 inch (14 mm)
4/4 inch1 inch13/16 inch (21 mm)
5/4 inch1 1/4 inch1 1/16 inch (27 mm)
6/4 inch1 1/2 inch1 5/16 inch (33 mm)

What is a 5 4 inch board?

5/4 lumber is lumber that was rough sawn to 1 1/4 inch. When it is finished planed as you would get at a retail lumberyard, it will measure about 1″ though that can sometiimes vary upward.

Is S4S a square?

Four Square, or S4S is a milling term used to describe this.

What does S4s stand for in woodworking?

S4S stands for “surfaced on 4 sides”, meaning that the material is finished on all four sides. Dimensional lumber is commonly S4S. S4S finished lumber and dimensional lumber are labeled according to nominal size, or the size of the rough board before it was planed smooth.

What’s the difference between S4s and dimensional lumber?

Dimensional lumber is commonly S4S. S4S finished lumber and dimensional lumber are labeled according to nominal size, or the size of the rough board before it was planed smooth. (For example, 1 x 6 is actually 3/4 x 5 1/2).

What’s the difference between S3s and S4s boards?

S3S – The board has been surfaced S2S first, then one edge is ripped straight (also known as SLR1E or straight line ripped one edge). S4S – The board has been surfaced on both faces (S2S) and received a rip on both edges, resulting in a board with two flat and parallel faces and two flat and parallel edges.

What kind of wood does SPF lumber come from?

SPF is an acronym for spruce, pine, and fir. SPF lumber typically refers to dimensional lumber or engineered wood derived from coniferous trees in North America. While most SPF lumber comes from Canada, SPF lumber can also come from trees in the northern United States. SPF lumber is further divided into two categories: Eastern and Western species.

What does S4s mean lumber?

S4S stands for “surfaced on 4 sides”, meaning that the material is finished on all four sides. Dimensional lumber is commonly S4S.

What is S4s in construction terms?

S4S is an abbreviation for “Surfaced on Four Sides”. It indicates a finish which renders both faces and both edges of a board planer-finished.

What is 5 4 lumber?

5/4 lumber is lumber that was rough sawn to 1 1/4 inch. When it is finished planed as you would get at a retail lumberyard, it will measure about 1″ though that can sometiimes vary upward.

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